How can I handle errors in FastAPI?

How can I handle errors in FastAPI?

In FastAPI, you can handle errors using exception handlers. You can define custom exception classes and use the @app.exception_handler decorator.

Can you show me an example of a custom exception handler?

Sure! Here's a simple example:

from fastapi import FastAPI, HTTPException

app = FastAPI()

class CustomException(Exception):
    pass

@app.exception_handler(CustomException)
async def custom_exception_handler(request, exc):
    return JSONResponse(status_code=418, content={'message': 'This is a custom error!'})

What about handling validation errors?

For validation errors, FastAPI automatically handles them and returns a 422 Unprocessable Entity response. You can customize the response by using the @app.exception_handler for RequestValidationError.

Is there a way to log errors when they occur?

Yes, you can use middleware or exception handlers to log errors. You can integrate logging libraries like logging to log error details.