From 552eb06bed4ed19a7321ab2b6ced950e7f8d0217 Mon Sep 17 00:00:00 2001
From: Shine1i <wasimysdev@gmail.com>
Date: Thu, 5 Mar 2026 19:48:26 +0100
Subject: [PATCH] feat(data-recipes, validators): add OXC validator runtime and
 integration with recipe studio

---
 .gitignore                                    |   1 +
 setup.sh                                      |   2 +
 .../data_recipe/local_callable_validators.py  | 301 ++++++++++++
 .../oxc-validator/package-lock.json           | 445 ++++++++++++++++++
 .../data_recipe/oxc-validator/package.json    |   9 +
 .../data_recipe/oxc-validator/validate.mjs    | 149 ++++++
 studio/backend/core/data_recipe/service.py    |  11 +
 .../recipe-studio/blocks/definitions.ts       |  19 +-
 .../recipe-studio/components/block-sheet.tsx  |   8 +-
 .../dialogs/validators/validator-dialog.tsx   |  26 +-
 .../hooks/use-recipe-editor-graph.ts          |   8 +-
 .../recipe-studio/stores/recipe-studio.ts     |   2 +-
 .../src/features/recipe-studio/types/index.ts |   8 +
 .../recipe-studio/utils/config-factories.ts   |  14 +-
 .../utils/graph/recipe-graph-connection.ts    |  31 +-
 .../utils/import/parsers/validator-parser.ts  |  43 +-
 .../features/recipe-studio/utils/node-data.ts |  17 +-
 .../utils/payload/builders-validator.ts       |  23 +
 .../recipe-studio/utils/payload/validate.ts   |  13 +
 .../recipe-studio/utils/validation.ts         |  10 +
 .../utils/validators/code-lang.ts             |  11 +
 21 files changed, 1132 insertions(+), 19 deletions(-)
 create mode 100644 studio/backend/core/data_recipe/local_callable_validators.py
 create mode 100644 studio/backend/core/data_recipe/oxc-validator/package-lock.json
 create mode 100644 studio/backend/core/data_recipe/oxc-validator/package.json
 create mode 100644 studio/backend/core/data_recipe/oxc-validator/validate.mjs

diff --git a/.gitignore b/.gitignore
index 0d0e7d1133..f7f914fb96 100755
--- a/.gitignore
+++ b/.gitignore
@@ -53,6 +53,7 @@ firebase-debug.log
 # Other
 resources/
 tmp/
+**/node_modules/
 auth.db
 studio/frontend/package-lock.json
 
diff --git a/setup.sh b/setup.sh
index 07ea131125..899677444b 100755
--- a/setup.sh
+++ b/setup.sh
@@ -99,6 +99,8 @@ echo "Building frontend..."
 cd "$SCRIPT_DIR/studio/frontend"
 run_quiet "npm install" npm install
 run_quiet "npm run build" npm run build
+cd "$SCRIPT_DIR/studio/backend/core/data_recipe/oxc-validator"
+run_quiet "npm install (oxc validator runtime)" npm install
 cd "$SCRIPT_DIR"
 echo "✅ Frontend built to studio/frontend/dist"
 
diff --git a/studio/backend/core/data_recipe/local_callable_validators.py b/studio/backend/core/data_recipe/local_callable_validators.py
new file mode 100644
index 0000000000..b9804e4b28
--- /dev/null
+++ b/studio/backend/core/data_recipe/local_callable_validators.py
@@ -0,0 +1,301 @@
+from __future__ import annotations
+
+import json
+import logging
+import subprocess
+from copy import deepcopy
+from dataclasses import dataclass
+from functools import lru_cache
+from pathlib import Path
+from typing import Any
+
+logger = logging.getLogger(__name__)
+
+OXC_VALIDATION_FN_MARKER = "unsloth_oxc_validator"
+
+_OXC_LANG_TO_NODE_LANG = {
+    "javascript": "js",
+    "typescript": "ts",
+    "jsx": "jsx",
+    "tsx": "tsx",
+}
+
+_OXC_TOOL_DIR = Path(__file__).resolve().parent / "oxc-validator"
+_OXC_RUNNER_PATH = _OXC_TOOL_DIR / "validate.mjs"
+
+
+@dataclass(frozen=True)
+class OxcLocalCallableValidatorSpec:
+    name: str
+    drop: bool
+    target_columns: list[str]
+    batch_size: int
+    code_lang: str
+
+
+def split_oxc_local_callable_validators(
+    recipe_core: dict[str, Any],
+) -> tuple[dict[str, Any], list[OxcLocalCallableValidatorSpec]]:
+    columns = recipe_core.get("columns")
+    if not isinstance(columns, list):
+        return recipe_core, []
+
+    sanitized = deepcopy(recipe_core)
+    sanitized_columns = sanitized.get("columns")
+    if not isinstance(sanitized_columns, list):
+        return sanitized, []
+
+    llm_code_lang_by_name = _extract_llm_code_lang_by_name(sanitized_columns)
+    kept_columns: list[Any] = []
+    oxc_specs: list[OxcLocalCallableValidatorSpec] = []
+
+    for column in sanitized_columns:
+        if not isinstance(column, dict):
+            kept_columns.append(column)
+            continue
+
+        maybe_spec = _parse_oxc_spec(
+            column=column,
+            llm_code_lang_by_name=llm_code_lang_by_name,
+        )
+        if maybe_spec is None:
+            kept_columns.append(column)
+            continue
+        oxc_specs.append(maybe_spec)
+
+    sanitized["columns"] = kept_columns
+    return sanitized, oxc_specs
+
+
+def register_oxc_local_callable_validators(
+    *,
+    builder,
+    specs: list[OxcLocalCallableValidatorSpec],
+) -> None:
+    if not specs:
+        return
+
+    from data_designer.config.column_configs import ValidationColumnConfig
+    from data_designer.config.validator_params import (
+        LocalCallableValidatorParams,
+        ValidatorType,
+    )
+
+    for spec in specs:
+        validation_function = _build_oxc_validation_function(spec.code_lang)
+        builder.add_column(
+            ValidationColumnConfig(
+                name=spec.name,
+                drop=spec.drop,
+                target_columns=spec.target_columns,
+                validator_type=ValidatorType.LOCAL_CALLABLE,
+                validator_params=LocalCallableValidatorParams(
+                    validation_function=validation_function,
+                ),
+                batch_size=spec.batch_size,
+            )
+        )
+
+
+def _parse_oxc_spec(
+    *,
+    column: dict[str, Any],
+    llm_code_lang_by_name: dict[str, str],
+) -> OxcLocalCallableValidatorSpec | None:
+    if str(column.get("column_type") or "").strip() != "validation":
+        return None
+    if str(column.get("validator_type") or "").strip() != "local_callable":
+        return None
+
+    params = column.get("validator_params")
+    if not isinstance(params, dict):
+        return None
+
+    fn_raw = params.get("validation_function")
+    fn_name = fn_raw.strip() if isinstance(fn_raw, str) else ""
+    if not fn_name.startswith(OXC_VALIDATION_FN_MARKER):
+        return None
+
+    name = str(column.get("name") or "").strip()
+    if not name:
+        return None
+
+    target_columns_raw = column.get("target_columns")
+    target_columns = (
+        [value.strip() for value in target_columns_raw if isinstance(value, str) and value.strip()]
+        if isinstance(target_columns_raw, list)
+        else []
+    )
+    if not target_columns:
+        return None
+
+    code_lang = _resolve_oxc_lang(
+        fn_name=fn_name,
+        target_columns=target_columns,
+        llm_code_lang_by_name=llm_code_lang_by_name,
+    )
+    batch_size = _parse_batch_size(column.get("batch_size"))
+    drop = bool(column.get("drop") is True)
+
+    return OxcLocalCallableValidatorSpec(
+        name=name,
+        drop=drop,
+        target_columns=target_columns,
+        batch_size=batch_size,
+        code_lang=code_lang,
+    )
+
+
+def _parse_batch_size(value: Any) -> int:
+    try:
+        parsed = int(value)
+    except (TypeError, ValueError):
+        return 10
+    return parsed if parsed >= 1 else 10
+
+
+def _extract_llm_code_lang_by_name(columns: list[Any]) -> dict[str, str]:
+    out: dict[str, str] = {}
+    for column in columns:
+        if not isinstance(column, dict):
+            continue
+        if str(column.get("column_type") or "").strip() != "llm-code":
+            continue
+        name = str(column.get("name") or "").strip()
+        code_lang = str(column.get("code_lang") or "").strip()
+        if name and code_lang:
+            out[name] = code_lang
+    return out
+
+
+def _resolve_oxc_lang(
+    *,
+    fn_name: str,
+    target_columns: list[str],
+    llm_code_lang_by_name: dict[str, str],
+) -> str:
+    _, _, marker_lang = fn_name.partition(":")
+    marker_lang = marker_lang.strip()
+    if marker_lang in _OXC_LANG_TO_NODE_LANG:
+        return marker_lang
+
+    first_target = target_columns[0]
+    target_lang = llm_code_lang_by_name.get(first_target, "").strip()
+    if target_lang in _OXC_LANG_TO_NODE_LANG:
+        return target_lang
+    return "javascript"
+
+
+@lru_cache(maxsize=8)
+def _build_oxc_validation_function(lang: str):
+    node_lang = _OXC_LANG_TO_NODE_LANG.get(lang, "js")
+
+    def _validator(df):
+        import pandas as pd  # imported lazily for local callable runtime
+
+        row_count = int(len(df.index))
+        if row_count == 0:
+            return pd.DataFrame({"is_valid": []})
+
+        code_column = str(df.columns[0]) if len(df.columns) > 0 else ""
+        code_values = (
+            ["" for _ in range(row_count)]
+            if not code_column
+            else ["" if value is None else str(value) for value in df[code_column].tolist()]
+        )
+
+        results = _run_oxc_batch(node_lang=node_lang, code_values=code_values)
+        if len(results) != row_count:
+            results = _fallback_results(
+                row_count,
+                "OXC validator returned mismatched result size.",
+            )
+        return pd.DataFrame(results)
+
+    _validator.__name__ = f"{OXC_VALIDATION_FN_MARKER}_{node_lang}"
+    return _validator
+
+
+def _run_oxc_batch(*, node_lang: str, code_values: list[str]) -> list[dict[str, Any]]:
+    if not _OXC_RUNNER_PATH.exists():
+        return _fallback_results(
+            len(code_values),
+            f"OXC runner missing at {_OXC_RUNNER_PATH}",
+        )
+
+    payload = {
+        "lang": node_lang,
+        "codes": code_values,
+    }
+    try:
+        proc = subprocess.run(
+            ["node", str(_OXC_RUNNER_PATH)],
+            cwd=str(_OXC_TOOL_DIR),
+            input=json.dumps(payload),
+            text=True,
+            capture_output=True,
+            check=False,
+        )
+    except (OSError, ValueError) as exc:
+        logger.warning("OXC subprocess launch failed: %s", exc)
+        return _fallback_results(len(code_values), f"OXC launch failed: {exc}")
+
+    if proc.returncode != 0:
+        message = (proc.stderr or proc.stdout or "unknown error").strip()
+        if len(message) > 300:
+            message = f"{message[:300]}..."
+        return _fallback_results(len(code_values), f"OXC failed: {message}")
+
+    try:
+        raw = json.loads(proc.stdout)
+    except json.JSONDecodeError:
+        return _fallback_results(len(code_values), "OXC output parse failed.")
+
+    if not isinstance(raw, list):
+        return _fallback_results(len(code_values), "OXC output must be an array.")
+
+    out: list[dict[str, Any]] = []
+    for item in raw:
+        if not isinstance(item, dict):
+            out.append(
+                {
+                    "is_valid": False,
+                    "error_count": 1,
+                    "error_message": "Invalid OXC result entry.",
+                    "severity": None,
+                    "labels": [],
+                    "codeframe": None,
+                }
+            )
+            continue
+        is_valid_raw = item.get("is_valid")
+        error_count_raw = item.get("error_count")
+        message_raw = item.get("error_message")
+        severity_raw = item.get("severity")
+        labels_raw = item.get("labels")
+        codeframe_raw = item.get("codeframe")
+        out.append(
+            {
+                "is_valid": bool(is_valid_raw) if isinstance(is_valid_raw, bool) else False,
+                "error_count": int(error_count_raw) if isinstance(error_count_raw, int) else 0,
+                "error_message": str(message_raw or ""),
+                "severity": str(severity_raw) if isinstance(severity_raw, str) else None,
+                "labels": labels_raw if isinstance(labels_raw, list) else [],
+                "codeframe": str(codeframe_raw) if isinstance(codeframe_raw, str) else None,
+            }
+        )
+    return out
+
+
+def _fallback_results(row_count: int, message: str) -> list[dict[str, Any]]:
+    return [
+        {
+            "is_valid": False,
+            "error_count": 1,
+            "error_message": message,
+            "severity": None,
+            "labels": [],
+            "codeframe": None,
+        }
+        for _ in range(row_count)
+    ]
diff --git a/studio/backend/core/data_recipe/oxc-validator/package-lock.json b/studio/backend/core/data_recipe/oxc-validator/package-lock.json
new file mode 100644
index 0000000000..2a97d4514e
--- /dev/null
+++ b/studio/backend/core/data_recipe/oxc-validator/package-lock.json
@@ -0,0 +1,445 @@
+{
+  "name": "unsloth-oxc-validator-runtime",
+  "version": "0.0.1",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "unsloth-oxc-validator-runtime",
+      "version": "0.0.1",
+      "dependencies": {
+        "oxc-parser": "^0.116.0"
+      }
+    },
+    "node_modules/@emnapi/core": {
+      "version": "1.8.1",
+      "resolved": "https://registry.npmjs.org/@emnapi/core/-/core-1.8.1.tgz",
+      "integrity": "sha512-AvT9QFpxK0Zd8J0jopedNm+w/2fIzvtPKPjqyw9jwvBaReTTqPBk9Hixaz7KbjimP+QNz605/XnjFcDAL2pqBg==",
+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "@emnapi/wasi-threads": "1.1.0",
+        "tslib": "^2.4.0"
+      }
+    },
+    "node_modules/@emnapi/runtime": {
+      "version": "1.8.1",
+      "resolved": "https://registry.npmjs.org/@emnapi/runtime/-/runtime-1.8.1.tgz",
+      "integrity": "sha512-mehfKSMWjjNol8659Z8KxEMrdSJDDot5SXMq00dM8BN4o+CLNXQ0xH2V7EchNHV4RmbZLmmPdEaXZc5H2FXmDg==",
+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "tslib": "^2.4.0"
+      }
+    },
+    "node_modules/@emnapi/wasi-threads": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@emnapi/wasi-threads/-/wasi-threads-1.1.0.tgz",
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+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "tslib": "^2.4.0"
+      }
+    },
+    "node_modules/@napi-rs/wasm-runtime": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/@napi-rs/wasm-runtime/-/wasm-runtime-1.1.1.tgz",
+      "integrity": "sha512-p64ah1M1ld8xjWv3qbvFwHiFVWrq1yFvV4f7w+mzaqiR4IlSgkqhcRdHwsGgomwzBH51sRY4NEowLxnaBjcW/A==",
+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "@emnapi/core": "^1.7.1",
+        "@emnapi/runtime": "^1.7.1",
+        "@tybys/wasm-util": "^0.10.1"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/Brooooooklyn"
+      }
+    },
+    "node_modules/@oxc-parser/binding-android-arm-eabi": {
+      "version": "0.116.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-android-arm-eabi/-/binding-android-arm-eabi-0.116.0.tgz",
+      "integrity": "sha512-AOET7YIOU3+ANO/3xQeRVGN5Xx6+JGXaIwlqkcHSfxJ/zzw2B6jb0YaLhX45SeRluKVTU8rka4N/tHtNoJjoCg==",
+      "cpu": [
+        "arm"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-android-arm64": {
+      "version": "0.116.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-android-arm64/-/binding-android-arm64-0.116.0.tgz",
+      "integrity": "sha512-yh0Zvth5cQ6XZkP3QF9MDrXf695zr5XxXq/wBQqpZb0uAgI9wpr98/Hx2RZITMfnNjkIq2VcyU44o3A0bdEmlQ==",
+      "cpu": [
+        "arm64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-darwin-arm64": {
+      "version": "0.116.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-darwin-arm64/-/binding-darwin-arm64-0.116.0.tgz",
+      "integrity": "sha512-plcTd/Jska55dToZz6XdRBPRVsj+asjD8QCpQFvt3Wj8pY+10D1pE53Mei3POAS/wSRSy7HiQ2twrm7H2A0CjA==",
+      "cpu": [
+        "arm64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-darwin-x64": {
+      "version": "0.116.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-darwin-x64/-/binding-darwin-x64-0.116.0.tgz",
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+      "cpu": [
+        "x64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-freebsd-x64": {
+      "version": "0.116.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-freebsd-x64/-/binding-freebsd-x64-0.116.0.tgz",
+      "integrity": "sha512-yo2/LaSXtlzKBurvNbwun/sN/RJwW3XhbMr069FwNVtft7GBnaLLdPIz/sf47icxw/BPViEX6wFvzeD12mtrAg==",
+      "cpu": [
+        "x64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "freebsd"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-linux-arm-gnueabihf": {
+      "version": "0.116.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-linux-arm-gnueabihf/-/binding-linux-arm-gnueabihf-0.116.0.tgz",
+      "integrity": "sha512-EiZeliIPPdFsuaPx8PzDMVijD/4YaUxO46/eYPk5raRocJqjjxOG6GAacQ8UrG3fbrgYjaEChfYL1e8DyE445A==",
+      "cpu": [
+        "arm"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-linux-arm-musleabihf": {
+      "version": "0.116.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-linux-arm-musleabihf/-/binding-linux-arm-musleabihf-0.116.0.tgz",
+      "integrity": "sha512-Nf7hnKRYRSIgglQcLAqE2St4b/Yr6dh+Z7in8mxol065Knevw71XZAiV1fmPSojq6uKPLV9eoH/wFrgr4TnZXw==",
+      "cpu": [
+        "arm"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-linux-arm64-gnu": {
+      "version": "0.116.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-linux-arm64-gnu/-/binding-linux-arm64-gnu-0.116.0.tgz",
+      "integrity": "sha512-9SJI0S4Qggn3QHpT8Y1jtZceA0m4BlpvO3ne2Wxd33UdTHMmelAnrXryjWutHWQtjCzOwSnFBEoQAdNNyt1u3A==",
+      "cpu": [
+        "arm64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-linux-arm64-musl": {
+      "version": "0.116.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-linux-arm64-musl/-/binding-linux-arm64-musl-0.116.0.tgz",
+      "integrity": "sha512-wMZ6//GI+q1JwO7G2OR51+eA5P8Gr3BobU8RAzCGJptvyGMkWb7KQ1E8s8naVZRr6bSGWAL2p3mCzKOxmEPmrA==",
+      "cpu": [
+        "arm64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-linux-ppc64-gnu": {
+      "version": "0.116.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-linux-ppc64-gnu/-/binding-linux-ppc64-gnu-0.116.0.tgz",
+      "integrity": "sha512-5BO0KCzTG2HZTnp3r6SCAOeCs/GwFBQJ1WAOG/ROfDf1fVVEy6hrtLKTLCuUMaamH38v+1+RVEmzRkzBj+rMDQ==",
+      "cpu": [
+        "ppc64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-linux-riscv64-gnu": {
+      "version": "0.116.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-linux-riscv64-gnu/-/binding-linux-riscv64-gnu-0.116.0.tgz",
+      "integrity": "sha512-M24gYb/ocVMnLwnH2wY5sLt4sRBkAUHDmfiYtyUYdKTkfPOKtpopd5otsL/BPLnIhpMD8zby4uXVvw7BU0UIlw==",
+      "cpu": [
+        "riscv64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-linux-riscv64-musl": {
+      "version": "0.116.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-linux-riscv64-musl/-/binding-linux-riscv64-musl-0.116.0.tgz",
+      "integrity": "sha512-LHLXTHCH0bdvGjlitwr1ngeh32GAgq9HYzQ5VAgt0k0UT84AS8AkXj9Spoa9l20fXkVgSvAKcCEkydi4Ol23Dw==",
+      "cpu": [
+        "riscv64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-linux-s390x-gnu": {
+      "version": "0.116.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-linux-s390x-gnu/-/binding-linux-s390x-gnu-0.116.0.tgz",
+      "integrity": "sha512-VE+XsztuE5jdHvLIDIQMuyDpz5NJGq1Vx/8EXYF0sS/gehlv9GhDpGVWU0SCZ/LjzIy4io/Z0W84UudqufvP3g==",
+      "cpu": [
+        "s390x"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-linux-x64-gnu": {
+      "version": "0.116.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-linux-x64-gnu/-/binding-linux-x64-gnu-0.116.0.tgz",
+      "integrity": "sha512-rxUkauyjjCmgA7BoR63ogRGEtgubROnCm8AXE9ydg+p42jCGLLqG05mFcS2eC+FYyAU58ZFJNXXeqFW1iCyTGQ==",
+      "cpu": [
+        "x64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-linux-x64-musl": {
+      "version": "0.116.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-linux-x64-musl/-/binding-linux-x64-musl-0.116.0.tgz",
+      "integrity": "sha512-0zoZlk9MmXe6oTgSh5lT1D51SDC1bfwC96JmE1amMFAPdEbJk5MFRisfTN9TFBpBigQua65842tjaxqMiorAYw==",
+      "cpu": [
+        "x64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-openharmony-arm64": {
+      "version": "0.116.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-openharmony-arm64/-/binding-openharmony-arm64-0.116.0.tgz",
+      "integrity": "sha512-PGS7Xqik77U9WMyW626gAD5A2rSN629UvyYJKAl/tgpT+KqZI4+56pJfExhv8IW/PpSHjYHwjmakwobLikz8ww==",
+      "cpu": [
+        "arm64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "openharmony"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-wasm32-wasi": {
+      "version": "0.116.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-wasm32-wasi/-/binding-wasm32-wasi-0.116.0.tgz",
+      "integrity": "sha512-lGNf/9PU8XxB4Gt1Gr1AKwSrjxGYa6os0PlrT4bpoQsfE3gaZonQTKwJyKhiQdgy7pBCI+ed1LB1NNib1FYULw==",
+      "cpu": [
+        "wasm32"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "@napi-rs/wasm-runtime": "^1.1.1"
+      },
+      "engines": {
+        "node": ">=14.0.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-win32-arm64-msvc": {
+      "version": "0.116.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-win32-arm64-msvc/-/binding-win32-arm64-msvc-0.116.0.tgz",
+      "integrity": "sha512-tcsOHE31duBSRQXZ7NfdtjmMKZwQYlS00PwAMJ4w5oXs3iPCvisUuIXP7Ko4FzeOBTRvkd64btxtQ6cRM0Kwlw==",
+      "cpu": [
+        "arm64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-win32-ia32-msvc": {
+      "version": "0.116.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-win32-ia32-msvc/-/binding-win32-ia32-msvc-0.116.0.tgz",
+      "integrity": "sha512-higCz/x+dOQ264YEk22hnu4RDqvjhfehjFORpxoh42QyUxsP6eIembYesBUu5ilALWo0HvRD+m89az2BSTwqpQ==",
+      "cpu": [
+        "ia32"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-parser/binding-win32-x64-msvc": {
+      "version": "0.116.0",
+      "resolved": "https://registry.npmjs.org/@oxc-parser/binding-win32-x64-msvc/-/binding-win32-x64-msvc-0.116.0.tgz",
+      "integrity": "sha512-Lg2SRmVHpGG85knDVLbv44r1bYn0OpIV0vg9jVmoEIpDj3Q4kwXuQ6MWVtuslwHR8o2CSiqdBeEn1n1URrs6Eg==",
+      "cpu": [
+        "x64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@oxc-project/types": {
+      "version": "0.116.0",
+      "resolved": "https://registry.npmjs.org/@oxc-project/types/-/types-0.116.0.tgz",
+      "integrity": "sha512-uOT8S1tlPmDckNxMNtIudN/yXpLdnhlJMX2oLS7cxCd7L0sUF09A/EbSVMWT3Y/iT44IwXCJSJfgfSxXAqWf9Q==",
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/Boshen"
+      }
+    },
+    "node_modules/@tybys/wasm-util": {
+      "version": "0.10.1",
+      "resolved": "https://registry.npmjs.org/@tybys/wasm-util/-/wasm-util-0.10.1.tgz",
+      "integrity": "sha512-9tTaPJLSiejZKx+Bmog4uSubteqTvFrVrURwkmHixBo0G4seD0zUxp98E1DzUBJxLQ3NPwXrGKDiVjwx/DpPsg==",
+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "tslib": "^2.4.0"
+      }
+    },
+    "node_modules/oxc-parser": {
+      "version": "0.116.0",
+      "resolved": "https://registry.npmjs.org/oxc-parser/-/oxc-parser-0.116.0.tgz",
+      "integrity": "sha512-ugEo6wwqaqCGcpi7GsLCwSkoD7gIXzvtdaTxE+mbrXFYazU5Q9YdpZdAj9z2b79i/xlv+uW2aAvyzGAlpUzhKQ==",
+      "license": "MIT",
+      "dependencies": {
+        "@oxc-project/types": "^0.116.0"
+      },
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/Boshen"
+      },
+      "optionalDependencies": {
+        "@oxc-parser/binding-android-arm-eabi": "0.116.0",
+        "@oxc-parser/binding-android-arm64": "0.116.0",
+        "@oxc-parser/binding-darwin-arm64": "0.116.0",
+        "@oxc-parser/binding-darwin-x64": "0.116.0",
+        "@oxc-parser/binding-freebsd-x64": "0.116.0",
+        "@oxc-parser/binding-linux-arm-gnueabihf": "0.116.0",
+        "@oxc-parser/binding-linux-arm-musleabihf": "0.116.0",
+        "@oxc-parser/binding-linux-arm64-gnu": "0.116.0",
+        "@oxc-parser/binding-linux-arm64-musl": "0.116.0",
+        "@oxc-parser/binding-linux-ppc64-gnu": "0.116.0",
+        "@oxc-parser/binding-linux-riscv64-gnu": "0.116.0",
+        "@oxc-parser/binding-linux-riscv64-musl": "0.116.0",
+        "@oxc-parser/binding-linux-s390x-gnu": "0.116.0",
+        "@oxc-parser/binding-linux-x64-gnu": "0.116.0",
+        "@oxc-parser/binding-linux-x64-musl": "0.116.0",
+        "@oxc-parser/binding-openharmony-arm64": "0.116.0",
+        "@oxc-parser/binding-wasm32-wasi": "0.116.0",
+        "@oxc-parser/binding-win32-arm64-msvc": "0.116.0",
+        "@oxc-parser/binding-win32-ia32-msvc": "0.116.0",
+        "@oxc-parser/binding-win32-x64-msvc": "0.116.0"
+      }
+    },
+    "node_modules/tslib": {
+      "version": "2.8.1",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
+      "integrity": "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==",
+      "license": "0BSD",
+      "optional": true
+    }
+  }
+}
diff --git a/studio/backend/core/data_recipe/oxc-validator/package.json b/studio/backend/core/data_recipe/oxc-validator/package.json
new file mode 100644
index 0000000000..2d1618162d
--- /dev/null
+++ b/studio/backend/core/data_recipe/oxc-validator/package.json
@@ -0,0 +1,9 @@
+{
+  "name": "unsloth-oxc-validator-runtime",
+  "private": true,
+  "version": "0.0.1",
+  "type": "module",
+  "dependencies": {
+    "oxc-parser": "^0.116.0"
+  }
+}
diff --git a/studio/backend/core/data_recipe/oxc-validator/validate.mjs b/studio/backend/core/data_recipe/oxc-validator/validate.mjs
new file mode 100644
index 0000000000..2fe94e0833
--- /dev/null
+++ b/studio/backend/core/data_recipe/oxc-validator/validate.mjs
@@ -0,0 +1,149 @@
+import { parseSync } from "oxc-parser";
+
+const LANG_TO_EXT = {
+  js: "js",
+  jsx: "jsx",
+  ts: "ts",
+  tsx: "tsx",
+};
+
+function mapLang(value) {
+  const normalized = String(value || "").trim().toLowerCase();
+  if (normalized === "javascript" || normalized === "js") {
+    return "js";
+  }
+  if (normalized === "typescript" || normalized === "ts") {
+    return "ts";
+  }
+  if (normalized === "jsx") {
+    return "jsx";
+  }
+  if (normalized === "tsx") {
+    return "tsx";
+  }
+  return "js";
+}
+
+function normalizeError(error) {
+  if (typeof error === "string") {
+    return {
+      message: error.trim() || "Unknown OXC error",
+      severity: null,
+      labels: [],
+      codeframe: null,
+    };
+  }
+  if (!error || typeof error !== "object") {
+    return {
+      message: "Unknown OXC error",
+      severity: null,
+      labels: [],
+      codeframe: null,
+    };
+  }
+  const message = String(error.message || error.reason || "").trim() || "Unknown OXC error";
+  const severity = typeof error.severity === "string" ? error.severity : null;
+  const labels = Array.isArray(error.labels)
+    ? error.labels.map((label) => ({
+        message:
+          label && typeof label === "object" && typeof label.message === "string"
+            ? label.message
+            : null,
+        start:
+          label && typeof label === "object" && Number.isInteger(label.start)
+            ? label.start
+            : null,
+        end:
+          label && typeof label === "object" && Number.isInteger(label.end)
+            ? label.end
+            : null,
+      }))
+    : [];
+  const codeframe = typeof error.codeframe === "string" ? error.codeframe : null;
+  return {
+    message,
+    severity,
+    labels,
+    codeframe,
+  };
+}
+
+function validateOne({ code, lang, index }) {
+  const ext = LANG_TO_EXT[lang] ?? "js";
+  const filename = `snippet_${index}.${ext}`;
+  const source = typeof code === "string" ? code : String(code ?? "");
+
+  try {
+    const parsed = parseSync(filename, source, {
+      lang,
+      sourceType: "module",
+      showSemanticErrors: true,
+    });
+    const errors = Array.isArray(parsed?.errors)
+      ? parsed.errors.map(normalizeError).filter(Boolean)
+      : [];
+    const first = errors[0] ?? null;
+    return {
+      is_valid: errors.length === 0,
+      error_count: errors.length,
+      error_message: errors.slice(0, 3).map((error) => error.message).join(" | "),
+      severity: first ? first.severity : null,
+      labels: first ? first.labels : [],
+      codeframe: first ? first.codeframe : null,
+    };
+  } catch (error) {
+    const normalized = normalizeError(error);
+    return {
+      is_valid: false,
+      error_count: 1,
+      error_message: normalized.message,
+      severity: normalized.severity,
+      labels: normalized.labels,
+      codeframe: normalized.codeframe,
+    };
+  }
+}
+
+function readStdin() {
+  return new Promise((resolve, reject) => {
+    let data = "";
+    process.stdin.setEncoding("utf8");
+    process.stdin.on("data", (chunk) => {
+      data += chunk;
+    });
+    process.stdin.on("end", () => resolve(data));
+    process.stdin.on("error", (error) => reject(error));
+  });
+}
+
+async function main() {
+  const raw = await readStdin();
+  let payload;
+  try {
+    payload = JSON.parse(raw || "{}");
+  } catch {
+    process.stdout.write(
+      JSON.stringify([
+        {
+          is_valid: false,
+          error_count: 1,
+          error_message: "Invalid JSON payload",
+          severity: null,
+          labels: [],
+          codeframe: null,
+        },
+      ]),
+    );
+    return;
+  }
+
+  const lang = mapLang(payload?.lang);
+  const codes = Array.isArray(payload?.codes) ? payload.codes : [];
+  const out = codes.map((code, index) => validateOne({ code, lang, index }));
+  process.stdout.write(JSON.stringify(out));
+}
+
+main().catch((error) => {
+  process.stderr.write(String(error?.stack || error));
+  process.exit(1);
+});
diff --git a/studio/backend/core/data_recipe/service.py b/studio/backend/core/data_recipe/service.py
index 6c2af4438e..f2c25e62f8 100644
--- a/studio/backend/core/data_recipe/service.py
+++ b/studio/backend/core/data_recipe/service.py
@@ -7,6 +7,10 @@ from pathlib import Path
 from typing import Any
 
 from .jsonable import to_jsonable
+from .local_callable_validators import (
+    register_oxc_local_callable_validators,
+    split_oxc_local_callable_validators,
+)
 _IMAGE_CONTEXT_PATCHED = False
 
 
@@ -196,7 +200,14 @@ def build_config_builder(recipe: dict[str, Any]):
         for key, value in recipe.items()
         if key not in {"model_providers", "mcp_providers"}
     }
+    recipe_core, oxc_local_callable_specs = split_oxc_local_callable_validators(
+        recipe_core
+    )
     builder = DataDesignerConfigBuilder.from_config({"data_designer": recipe_core})
+    register_oxc_local_callable_validators(
+        builder=builder,
+        specs=oxc_local_callable_specs,
+    )
 
     # DataDesignerConfigBuilder.from_config currently skips processors.
     # Re-attach explicitly so drop_columns/schema_transform survive API payload.
diff --git a/studio/frontend/src/features/recipe-studio/blocks/definitions.ts b/studio/frontend/src/features/recipe-studio/blocks/definitions.ts
index a37a24ad3b..2dcd3c4c43 100644
--- a/studio/frontend/src/features/recipe-studio/blocks/definitions.ts
+++ b/studio/frontend/src/features/recipe-studio/blocks/definitions.ts
@@ -46,6 +46,7 @@ export type BlockType =
   | LlmType
   | "validator_python"
   | "validator_sql"
+  | "validator_oxc"
   | "expression"
   | "markdown_note"
   | "seed"
@@ -303,7 +304,8 @@ const BLOCK_DEFINITIONS: BlockDefinition[] = [
     description: "Validate Python code columns.",
     icon: Shield02Icon,
     dialogKey: "validator",
-    createConfig: (id, existing) => makeValidatorConfig(id, "python", existing),
+    createConfig: (id, existing) =>
+      makeValidatorConfig(id, "code", "python", existing),
   },
   {
     kind: "validator",
@@ -313,7 +315,17 @@ const BLOCK_DEFINITIONS: BlockDefinition[] = [
     icon: Shield02Icon,
     dialogKey: "validator",
     createConfig: (id, existing) =>
-      makeValidatorConfig(id, "sql:sqlite", existing),
+      makeValidatorConfig(id, "code", "sql:sqlite", existing),
+  },
+  {
+    kind: "validator",
+    type: "validator_oxc",
+    title: "OXC Validator",
+    description: "Validate JavaScript or TypeScript code columns.",
+    icon: Shield02Icon,
+    dialogKey: "validator",
+    createConfig: (id, existing) =>
+      makeValidatorConfig(id, "oxc", "javascript", existing),
   },
   {
     kind: "expression",
@@ -372,6 +384,9 @@ export function getBlockDefinitionForConfig(
     return getBlockDefinition("llm", config.llm_type);
   }
   if (config.kind === "validator") {
+    if (config.validator_type === "oxc") {
+      return getBlockDefinition("validator", "validator_oxc");
+    }
     const isSql = config.code_lang.startsWith("sql:");
     return getBlockDefinition(
       "validator",
diff --git a/studio/frontend/src/features/recipe-studio/components/block-sheet.tsx b/studio/frontend/src/features/recipe-studio/components/block-sheet.tsx
index adc6512aab..bf4785943e 100644
--- a/studio/frontend/src/features/recipe-studio/components/block-sheet.tsx
+++ b/studio/frontend/src/features/recipe-studio/components/block-sheet.tsx
@@ -71,7 +71,9 @@ type BlockSheetProps = {
   onAddModelProvider: () => void;
   onAddModelConfig: () => void;
   onAddExpression: () => void;
-  onAddValidator: (type: "validator_python" | "validator_sql") => void;
+  onAddValidator: (
+    type: "validator_python" | "validator_sql" | "validator_oxc",
+  ) => void;
   onAddMarkdownNote: () => void;
   onOpenProcessors: () => void;
   copied: boolean;
@@ -318,7 +320,9 @@ export function BlockSheet({
       return;
     }
     if (kind === "validator") {
-      onAddValidator(type as "validator_python" | "validator_sql");
+      onAddValidator(
+        type as "validator_python" | "validator_sql" | "validator_oxc",
+      );
       return;
     }
     if (kind === "expression") {
diff --git a/studio/frontend/src/features/recipe-studio/dialogs/validators/validator-dialog.tsx b/studio/frontend/src/features/recipe-studio/dialogs/validators/validator-dialog.tsx
index fa6e3341fb..536d2445da 100644
--- a/studio/frontend/src/features/recipe-studio/dialogs/validators/validator-dialog.tsx
+++ b/studio/frontend/src/features/recipe-studio/dialogs/validators/validator-dialog.tsx
@@ -14,7 +14,11 @@ import {
 import { type ReactElement, useMemo } from "react";
 import { useRecipeStudioStore } from "../../stores/recipe-studio";
 import type { ValidatorConfig } from "../../types";
-import { isValidatorCodeLang } from "../../utils/validators/code-lang";
+import {
+  isValidatorCodeLang,
+  VALIDATOR_OXC_CODE_LANGS,
+  VALIDATOR_SQL_CODE_LANGS,
+} from "../../utils/validators/code-lang";
 import { FieldLabel } from "../shared/field-label";
 import { NameField } from "../shared/name-field";
 
@@ -40,6 +44,22 @@ export function ValidatorDialog({
           if (!(item.kind === "llm" && item.llm_type === "code")) {
             return [];
           }
+          if (config.validator_type === "oxc") {
+            const lang = item.code_lang?.trim() ?? "";
+            if (!VALIDATOR_OXC_CODE_LANGS.includes(lang as typeof config.code_lang)) {
+              return [];
+            }
+          } else {
+            const lang = item.code_lang?.trim() ?? "";
+            if (
+              !(
+                lang === "python" ||
+                VALIDATOR_SQL_CODE_LANGS.includes(lang as typeof config.code_lang)
+              )
+            ) {
+              return [];
+            }
+          }
           return [
             {
               name: item.name,
@@ -102,7 +122,9 @@ export function ValidatorDialog({
         </Select>
         {codeOptions.length === 0 && (
           <p className="text-xs text-muted-foreground">
-            Add an LLM Code block first.
+            {config.validator_type === "oxc"
+              ? "Add an LLM Code block with javascript/typescript first."
+              : "Add an LLM Code block first."}
           </p>
         )}
       </div>
diff --git a/studio/frontend/src/features/recipe-studio/hooks/use-recipe-editor-graph.ts b/studio/frontend/src/features/recipe-studio/hooks/use-recipe-editor-graph.ts
index d0837c81f5..8e8582b855 100644
--- a/studio/frontend/src/features/recipe-studio/hooks/use-recipe-editor-graph.ts
+++ b/studio/frontend/src/features/recipe-studio/hooks/use-recipe-editor-graph.ts
@@ -69,7 +69,7 @@ type UseRecipeEditorGraphArgs = {
   addModelConfigNode: (position?: XYPosition, openDialog?: boolean) => void;
   addExpressionNode: (position?: XYPosition, openDialog?: boolean) => void;
   addValidatorNode: (
-    type: "validator_python" | "validator_sql",
+    type: "validator_python" | "validator_sql" | "validator_oxc",
     position?: XYPosition,
     openDialog?: boolean,
   ) => void;
@@ -92,7 +92,7 @@ type UseRecipeEditorGraphResult = {
   handleAddModelConfigFromSheet: () => void;
   handleAddExpressionFromSheet: () => void;
   handleAddValidatorFromSheet: (
-    type: "validator_python" | "validator_sql",
+    type: "validator_python" | "validator_sql" | "validator_oxc",
   ) => void;
   handleAddMarkdownNoteFromSheet: () => void;
 };
@@ -213,7 +213,7 @@ export function useRecipeEditorGraph({
       }
       if (payload.kind === "validator") {
         addValidatorNode(
-          payload.type as "validator_python" | "validator_sql",
+          payload.type as "validator_python" | "validator_sql" | "validator_oxc",
           position,
           false,
         );
@@ -291,7 +291,7 @@ export function useRecipeEditorGraph({
   }, [addExpressionNode, getViewportCenterPosition]);
 
   const handleAddValidatorFromSheet = useCallback(
-    (type: "validator_python" | "validator_sql") => {
+    (type: "validator_python" | "validator_sql" | "validator_oxc") => {
       addValidatorNode(type, getViewportCenterPosition());
     },
     [addValidatorNode, getViewportCenterPosition],
diff --git a/studio/frontend/src/features/recipe-studio/stores/recipe-studio.ts b/studio/frontend/src/features/recipe-studio/stores/recipe-studio.ts
index 5183c725ab..38f4dd56d4 100644
--- a/studio/frontend/src/features/recipe-studio/stores/recipe-studio.ts
+++ b/studio/frontend/src/features/recipe-studio/stores/recipe-studio.ts
@@ -97,7 +97,7 @@ type RecipeStudioState = {
   addModelConfigNode: (position?: XYPosition, openDialog?: boolean) => void;
   addExpressionNode: (position?: XYPosition, openDialog?: boolean) => void;
   addValidatorNode: (
-    type: "validator_python" | "validator_sql",
+    type: "validator_python" | "validator_sql" | "validator_oxc",
     position?: XYPosition,
     openDialog?: boolean,
   ) => void;
diff --git a/studio/frontend/src/features/recipe-studio/types/index.ts b/studio/frontend/src/features/recipe-studio/types/index.ts
index 1b8a829192..210716a540 100644
--- a/studio/frontend/src/features/recipe-studio/types/index.ts
+++ b/studio/frontend/src/features/recipe-studio/types/index.ts
@@ -14,6 +14,10 @@ export type SamplerType =
 
 export type LlmType = "text" | "structured" | "code" | "judge";
 export type ValidatorCodeLang =
+  | "javascript"
+  | "typescript"
+  | "jsx"
+  | "tsx"
   | "python"
   | "sql:sqlite"
   | "sql:postgres"
@@ -21,6 +25,7 @@ export type ValidatorCodeLang =
   | "sql:tsql"
   | "sql:bigquery"
   | "sql:ansi";
+export type ValidatorType = "code" | "oxc";
 
 export type ExpressionDtype = "str" | "int" | "float" | "bool";
 
@@ -48,6 +53,7 @@ export type RecipeNodeData = {
     | LlmType
     | "validator_python"
     | "validator_sql"
+    | "validator_oxc"
     | "expression"
     | "seed"
     | "markdown_note"
@@ -258,6 +264,8 @@ export type ValidatorConfig = {
   drop?: boolean;
   // biome-ignore lint/style/useNamingConvention: api schema
   target_columns: string[];
+  // ui-only
+  validator_type: ValidatorType;
   // biome-ignore lint/style/useNamingConvention: api schema
   code_lang: ValidatorCodeLang;
   // ui ergonomics (serialized to int in payload)
diff --git a/studio/frontend/src/features/recipe-studio/utils/config-factories.ts b/studio/frontend/src/features/recipe-studio/utils/config-factories.ts
index 67de6dc7e4..44ca5b0fca 100644
--- a/studio/frontend/src/features/recipe-studio/utils/config-factories.ts
+++ b/studio/frontend/src/features/recipe-studio/utils/config-factories.ts
@@ -11,6 +11,7 @@ import type {
   SamplerConfig,
   SamplerType,
   ValidatorCodeLang,
+  ValidatorType,
   ValidatorConfig,
 } from "../types";
 import { nextName } from "./naming";
@@ -279,17 +280,26 @@ export function makeExpressionConfig(
 
 export function makeValidatorConfig(
   id: string,
+  validatorType: ValidatorType,
   codeLang: ValidatorCodeLang,
   existing: NodeConfig[],
 ): ValidatorConfig {
-  const isSql = codeLang.startsWith("sql:");
+  const isSql = validatorType === "code" && codeLang.startsWith("sql:");
+  const isOxc = validatorType === "oxc";
+  let namePrefix = "validator_python";
+  if (isSql) {
+    namePrefix = "validator_sql";
+  } else if (isOxc) {
+    namePrefix = "validator_oxc";
+  }
   return {
     id,
     kind: "validator",
-    name: nextName(existing, isSql ? "validator_sql" : "validator_python"),
+    name: nextName(existing, namePrefix),
     drop: false,
     // biome-ignore lint/style/useNamingConvention: api schema
     target_columns: [],
+    validator_type: validatorType,
     // biome-ignore lint/style/useNamingConvention: api schema
     code_lang: codeLang,
     batch_size: "10",
diff --git a/studio/frontend/src/features/recipe-studio/utils/graph/recipe-graph-connection.ts b/studio/frontend/src/features/recipe-studio/utils/graph/recipe-graph-connection.ts
index 82bf105e4d..fc109804e6 100644
--- a/studio/frontend/src/features/recipe-studio/utils/graph/recipe-graph-connection.ts
+++ b/studio/frontend/src/features/recipe-studio/utils/graph/recipe-graph-connection.ts
@@ -15,6 +15,10 @@ import {
   isLlmConfig,
   isSubcategoryConfig,
 } from "../index";
+import {
+  VALIDATOR_OXC_CODE_LANGS,
+  VALIDATOR_SQL_CODE_LANGS,
+} from "../validators/code-lang";
 
 function buildTemplateWithRef(template: string, ref: string): string {
   if (template.includes(ref)) {
@@ -147,6 +151,25 @@ function isModelSemanticRelation(source: NodeConfig, target: NodeConfig): boolea
   );
 }
 
+function canApplyCodeLangToValidator(
+  validator: Extract<NodeConfig, { kind: "validator" }>,
+  codeLang: string,
+): boolean {
+  const normalized = codeLang.trim();
+  if (!normalized) {
+    return false;
+  }
+  if (validator.validator_type === "oxc") {
+    return VALIDATOR_OXC_CODE_LANGS.includes(
+      normalized as typeof validator.code_lang,
+    );
+  }
+  if (normalized === "python") {
+    return true;
+  }
+  return VALIDATOR_SQL_CODE_LANGS.includes(normalized as typeof validator.code_lang);
+}
+
 function countHandleUsage(
   edges: Edge[],
   nodeId: string,
@@ -366,13 +389,19 @@ export function applyRecipeConnection(
     target.kind === "validator"
   ) {
     const nextCodeLang = (source.code_lang ?? "").trim();
+    const canUseCodeLangForTarget = canApplyCodeLangToValidator(
+      target,
+      nextCodeLang,
+    );
     const next = {
       ...target,
       // biome-ignore lint/style/useNamingConvention: api schema
       target_columns: [source.name],
       // biome-ignore lint/style/useNamingConvention: api schema
       code_lang:
-        (nextCodeLang || target.code_lang) as typeof target.code_lang,
+        (
+          canUseCodeLangForTarget ? nextCodeLang : target.code_lang
+        ) as typeof target.code_lang,
     };
     return { edges: nextEdges, configs: { ...configs, [target.id]: next } };
   }
diff --git a/studio/frontend/src/features/recipe-studio/utils/import/parsers/validator-parser.ts b/studio/frontend/src/features/recipe-studio/utils/import/parsers/validator-parser.ts
index 466b20dafd..f982245821 100644
--- a/studio/frontend/src/features/recipe-studio/utils/import/parsers/validator-parser.ts
+++ b/studio/frontend/src/features/recipe-studio/utils/import/parsers/validator-parser.ts
@@ -2,6 +2,36 @@ import type { ValidatorConfig } from "../../../types";
 import { readNumberString } from "../helpers";
 import { normalizeValidatorCodeLang } from "../../validators/code-lang";
 
+const OXC_VALIDATION_FN_MARKER = "unsloth_oxc_validator";
+
+function parseOxcCodeLang(validationFunctionRaw: string): string {
+  if (!validationFunctionRaw.startsWith(OXC_VALIDATION_FN_MARKER)) {
+    return "";
+  }
+  const suffix = validationFunctionRaw
+    .slice(OXC_VALIDATION_FN_MARKER.length)
+    .trim();
+  if (!suffix) {
+    return "";
+  }
+  const normalizedSuffix = suffix.startsWith(":") || suffix.startsWith("_")
+    ? suffix.slice(1).trim().toLowerCase()
+    : suffix.toLowerCase();
+  if (normalizedSuffix === "js") {
+    return "javascript";
+  }
+  if (normalizedSuffix === "ts") {
+    return "typescript";
+  }
+  if (normalizedSuffix === "jsx" || normalizedSuffix === "tsx") {
+    return normalizedSuffix;
+  }
+  if (normalizedSuffix === "javascript" || normalizedSuffix === "typescript") {
+    return normalizedSuffix;
+  }
+  return "";
+}
+
 export function parseValidator(
   column: Record<string, unknown>,
   name: string,
@@ -17,6 +47,14 @@ export function parseValidator(
     column.validator_params && typeof column.validator_params === "object"
       ? (column.validator_params as Record<string, unknown>)
       : {};
+  const validationFunctionRaw =
+    typeof params.validation_function === "string"
+      ? params.validation_function.trim()
+      : "";
+  const isOxc =
+    String(column.validator_type ?? "").trim() === "local_callable" &&
+    validationFunctionRaw.startsWith(OXC_VALIDATION_FN_MARKER);
+  const oxcLang = isOxc ? parseOxcCodeLang(validationFunctionRaw) : "";
   return {
     id,
     kind: "validator",
@@ -24,8 +62,11 @@ export function parseValidator(
     drop: column.drop === true,
     // biome-ignore lint/style/useNamingConvention: api schema
     target_columns: targetColumns,
+    validator_type: isOxc ? "oxc" : "code",
     // biome-ignore lint/style/useNamingConvention: api schema
-    code_lang: normalizeValidatorCodeLang(params.code_lang),
+    code_lang: normalizeValidatorCodeLang(
+      isOxc ? oxcLang || "javascript" : params.code_lang,
+    ),
     batch_size: readNumberString(column.batch_size) || "10",
   };
 }
diff --git a/studio/frontend/src/features/recipe-studio/utils/node-data.ts b/studio/frontend/src/features/recipe-studio/utils/node-data.ts
index 1f71481d9a..c887a979c3 100644
--- a/studio/frontend/src/features/recipe-studio/utils/node-data.ts
+++ b/studio/frontend/src/features/recipe-studio/utils/node-data.ts
@@ -30,13 +30,22 @@ export function nodeDataFromConfig(
     };
   }
   if (config.kind === "validator") {
+    const isOxc = config.validator_type === "oxc";
+    const isSql = config.code_lang.startsWith("sql:");
+    let subtype = "Python";
+    let blockType: RecipeNodeData["blockType"] = "validator_python";
+    if (isOxc) {
+      subtype = "OXC";
+      blockType = "validator_oxc";
+    } else if (isSql) {
+      subtype = "SQL";
+      blockType = "validator_sql";
+    }
     return {
       title: "Validator",
       kind: "validator",
-      subtype: config.code_lang.startsWith("sql:") ? "SQL" : "Python",
-      blockType: config.code_lang.startsWith("sql:")
-        ? "validator_sql"
-        : "validator_python",
+      subtype,
+      blockType,
       name: config.name,
       layoutDirection,
     };
diff --git a/studio/frontend/src/features/recipe-studio/utils/payload/builders-validator.ts b/studio/frontend/src/features/recipe-studio/utils/payload/builders-validator.ts
index 6fd8ccea37..a4c473ab24 100644
--- a/studio/frontend/src/features/recipe-studio/utils/payload/builders-validator.ts
+++ b/studio/frontend/src/features/recipe-studio/utils/payload/builders-validator.ts
@@ -1,5 +1,7 @@
 import type { ValidatorConfig } from "../../types";
 
+const OXC_VALIDATION_FN_MARKER = "unsloth_oxc_validator";
+
 function parseBatchSize(value: string): number {
   const parsed = Number.parseInt(value, 10);
   if (!Number.isFinite(parsed) || parsed < 1) {
@@ -18,6 +20,27 @@ export function buildValidatorColumn(
   if (targetColumns.length === 0) {
     errors.push(`Validator ${config.name}: target code column required.`);
   }
+  if (config.validator_type === "oxc") {
+    return {
+      // biome-ignore lint/style/useNamingConvention: api schema
+      column_type: "validation",
+      name: config.name,
+      drop: config.drop ?? false,
+      // biome-ignore lint/style/useNamingConvention: api schema
+      target_columns: targetColumns,
+      // biome-ignore lint/style/useNamingConvention: api schema
+      validator_type: "local_callable",
+      // biome-ignore lint/style/useNamingConvention: api schema
+      validator_params: {
+        // backend resolves this marker to a real callable.
+        // biome-ignore lint/style/useNamingConvention: api schema
+        validation_function: `${OXC_VALIDATION_FN_MARKER}:${config.code_lang}`,
+      },
+      // biome-ignore lint/style/useNamingConvention: api schema
+      batch_size: parseBatchSize(config.batch_size),
+    };
+  }
+
   return {
     // biome-ignore lint/style/useNamingConvention: api schema
     column_type: "validation",
diff --git a/studio/frontend/src/features/recipe-studio/utils/payload/validate.ts b/studio/frontend/src/features/recipe-studio/utils/payload/validate.ts
index 446e61c7a3..bc303689fb 100644
--- a/studio/frontend/src/features/recipe-studio/utils/payload/validate.ts
+++ b/studio/frontend/src/features/recipe-studio/utils/payload/validate.ts
@@ -2,8 +2,10 @@ import type {
   ModelConfig,
   ModelProviderConfig,
   NodeConfig,
+  ValidatorCodeLang,
   ValidatorConfig,
 } from "../../types";
+import { VALIDATOR_OXC_CODE_LANGS } from "../validators/code-lang";
 
 export function validateSubcategoryConfigs(
   configs: Record<string, NodeConfig>,
@@ -134,6 +136,17 @@ export function validateValidatorConfigs(
       errors.push(`Validator ${config.name}: target '${target}' must be LLM Code.`);
       continue;
     }
+    if (
+      config.validator_type === "oxc" &&
+      !VALIDATOR_OXC_CODE_LANGS.includes(
+        (targetConfig.code_lang ?? "").trim() as ValidatorCodeLang,
+      )
+    ) {
+      errors.push(
+        `Validator ${config.name}: target '${target}' must use javascript/typescript/jsx/tsx.`,
+      );
+      continue;
+    }
     if ((targetConfig.code_lang ?? "").trim() !== config.code_lang.trim()) {
       errors.push(
         `Validator ${config.name}: code_lang '${config.code_lang}' must match target '${target}' (${targetConfig.code_lang ?? "unknown"}).`,
diff --git a/studio/frontend/src/features/recipe-studio/utils/validation.ts b/studio/frontend/src/features/recipe-studio/utils/validation.ts
index 8d62c45eb7..a130fabd15 100644
--- a/studio/frontend/src/features/recipe-studio/utils/validation.ts
+++ b/studio/frontend/src/features/recipe-studio/utils/validation.ts
@@ -1,5 +1,6 @@
 import type { NodeConfig } from "../types";
 import { isValidSex, parseAgeRange, parseIntNumber, parseNumber } from "./parse";
+import { VALIDATOR_OXC_CODE_LANGS, VALIDATOR_SQL_CODE_LANGS } from "./validators/code-lang";
 
 const TRACE_MODES = new Set(["none", "last_message", "all_messages"]);
 
@@ -205,6 +206,15 @@ export function getConfigErrors(config: NodeConfig | null): string[] {
     }
     if (!config.code_lang.trim()) {
       errors.push("Validator code language is required.");
+    } else if (config.validator_type === "oxc") {
+      if (!VALIDATOR_OXC_CODE_LANGS.includes(config.code_lang)) {
+        errors.push("OXC validator code language must be javascript/typescript/jsx/tsx.");
+      }
+    } else if (
+      config.code_lang !== "python" &&
+      !VALIDATOR_SQL_CODE_LANGS.includes(config.code_lang)
+    ) {
+      errors.push("Code validator code language must be python or sql dialect.");
     }
   }
   if (config.kind === "seed") {
diff --git a/studio/frontend/src/features/recipe-studio/utils/validators/code-lang.ts b/studio/frontend/src/features/recipe-studio/utils/validators/code-lang.ts
index 1b2778f8b7..35aeb32388 100644
--- a/studio/frontend/src/features/recipe-studio/utils/validators/code-lang.ts
+++ b/studio/frontend/src/features/recipe-studio/utils/validators/code-lang.ts
@@ -1,5 +1,12 @@
 import type { ValidatorCodeLang } from "../../types";
 
+export const VALIDATOR_OXC_CODE_LANGS: ValidatorCodeLang[] = [
+  "javascript",
+  "typescript",
+  "jsx",
+  "tsx",
+];
+
 export const VALIDATOR_SQL_CODE_LANGS: ValidatorCodeLang[] = [
   "sql:sqlite",
   "sql:postgres",
@@ -10,6 +17,7 @@ export const VALIDATOR_SQL_CODE_LANGS: ValidatorCodeLang[] = [
 ];
 
 const VALIDATOR_CODE_LANG_SET = new Set<ValidatorCodeLang>([
+  ...VALIDATOR_OXC_CODE_LANGS,
   "python",
   ...VALIDATOR_SQL_CODE_LANGS,
 ]);
@@ -25,6 +33,9 @@ export function normalizeValidatorCodeLang(
   if (!raw) {
     return "python";
   }
+  if (VALIDATOR_OXC_CODE_LANGS.includes(raw as ValidatorCodeLang)) {
+    return raw as ValidatorCodeLang;
+  }
   if (raw === "python") {
     return "python";
   }