FastAPI Error Handling

HTTPException: Most General Solution

class HTTPException:
    def __init__(self, status_code: int, detail: Any = None, headers: dict[str, str] = None): ...

Default exception handler of HTTPException will return:

{
    "detail": ...
}

Custom Exception Handler

Register exception handler to the app, or override the default exception handler.

from fastapi import Request
from fastapi.responses import JSONResponse

class CustomException(BaseException): ...

@app.exception_handler(CustomException)
async def custom_exception_handler_example(request: Request, exc: CustomException) -> JSONResponse: ...

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