fastmcp/docs/patterns/fastapi.mdx

---
title: FastAPI Integration
sidebarTitle: FastAPI
description: Generate MCP servers from FastAPI apps
icon: square-bolt
---
import { VersionBadge } from '/snippets/version-badge.mdx'

<VersionBadge version="2.0.0" />

<Note>
**Documentation Moved**: The comprehensive FastAPI integration documentation has been moved to the [OpenAPI Integration](/patterns/openapi#fastapi-integration) page, where it's covered alongside all other OpenAPI features including route mapping and tags support.
</Note>

## Quick Start

FastMCP can automatically convert FastAPI applications into MCP servers:

```python
from fastapi import FastAPI
from fastmcp import FastMCP

# A FastAPI app
app = FastAPI()

@app.get("/items")
def list_items():
    return [{"id": 1, "name": "Item 1"}, {"id": 2, "name": "Item 2"}]

@app.get("/items/{item_id}")
def get_item(item_id: int):
    return {"id": item_id, "name": f"Item {item_id}"}

@app.post("/items")
def create_item(name: str):
    return {"id": 3, "name": name}

# Create an MCP server from your FastAPI app
mcp = FastMCP.from_fastapi(app=app)

if __name__ == "__main__":
    mcp.run()  # Start the MCP server
```

<Tip>
For complete documentation including tag-based routing, route mapping configuration, timeout settings, authentication examples, and advanced configuration options, see the comprehensive [OpenAPI Integration documentation](/patterns/openapi#fastapi-integration).
</Tip>