fastmcp/docs/python-sdk/fastmcp-utilities-json_schema.mdx
2025-07-22 19:27:43 -04:00

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---
title: json_schema
sidebarTitle: json_schema
---
# `fastmcp.utilities.json_schema`
## Functions
### `compress_schema` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/utilities/json_schema.py#L183" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
```python
compress_schema(schema: dict, prune_params: list[str] | None = None, prune_defs: bool = True, prune_additional_properties: bool = True, prune_titles: bool = False) -> dict
```
Remove the given parameters from the schema.
**Args:**
- `schema`: The schema to compress
- `prune_params`: List of parameter names to remove from properties
- `prune_defs`: Whether to remove unused definitions
- `prune_additional_properties`: Whether to remove additionalProperties\: false
- `prune_titles`: Whether to remove title fields from the schema