# FastAPI Problems
[](https://github.com/astral-sh/uv)
[](https://github.com/astral-sh/ruff)
[](https://pypi.org/project/fastapi-problem/)
[](https://pypi.org/project/fastapi-problem/)
[](https://pypi.org/project/fastapi-problem/)
[](https://codecov.io/gh/NRWLDev/fastapi-problem)
`fastapi_problem` is a set of exceptions and handlers for use in fastapi
applications to support easy error management and responses.
Each exception easily marshals to JSON based on the
[RFC9457](https://www.rfc-editor.org/rfc/rfc9457.html) spec for use in api
errors.
Check the [docs](https://nrwldev.github.io/fastapi-problem) for more details.
## Custom Errors
Subclassing the convenience classes provide a simple way to consistently raise
the same error with detail/extras changing based on the raised context.
```python
from fastapi_problem.error import NotFoundProblem
class UserNotFoundError(NotFoundProblem):
title = "User not found."
raise UserNotFoundError(detail="detail")
```
```json
{
"type": "user-not-found",
"title": "User not found",
"detail": "detail",
"status": 404,
}
```
## Usage
```python
import fastapi
from fastapi_problem.handler import add_exception_handler, new_exception_handler
app = fastapi.FastAPI()
eh = new_exception_handler()
add_exception_handler(app, eh)
@app.get("/user")
async def get_user():
raise UserNotFoundError("No user found.")
```
```bash
$ curl localhost:8000/user
{
"type": "user-not-found",
"title": "User not found",
"detail": "No user found.",
"status": 404,
}
```
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"description": "# FastAPI Problems\n[](https://github.com/astral-sh/uv)\n[](https://github.com/astral-sh/ruff)\n[](https://pypi.org/project/fastapi-problem/)\n[](https://pypi.org/project/fastapi-problem/)\n[](https://pypi.org/project/fastapi-problem/)\n\n\n[](https://codecov.io/gh/NRWLDev/fastapi-problem)\n\n`fastapi_problem` is a set of exceptions and handlers for use in fastapi\napplications to support easy error management and responses.\n\nEach exception easily marshals to JSON based on the\n[RFC9457](https://www.rfc-editor.org/rfc/rfc9457.html) spec for use in api\nerrors.\n\nCheck the [docs](https://nrwldev.github.io/fastapi-problem) for more details.\n\n## Custom Errors\n\nSubclassing the convenience classes provide a simple way to consistently raise\nthe same error with detail/extras changing based on the raised context.\n\n```python\nfrom fastapi_problem.error import NotFoundProblem\n\n\nclass UserNotFoundError(NotFoundProblem):\n title = \"User not found.\"\n\nraise UserNotFoundError(detail=\"detail\")\n```\n\n```json\n{\n \"type\": \"user-not-found\",\n \"title\": \"User not found\",\n \"detail\": \"detail\",\n \"status\": 404,\n}\n```\n\n## Usage\n\n```python\nimport fastapi\nfrom fastapi_problem.handler import add_exception_handler, new_exception_handler\n\n\napp = fastapi.FastAPI()\neh = new_exception_handler()\nadd_exception_handler(app, eh)\n\n@app.get(\"/user\")\nasync def get_user():\n raise UserNotFoundError(\"No user found.\")\n```\n\n```bash\n$ curl localhost:8000/user\n{\n\n \"type\": \"user-not-found\",\n \"title\": \"User not found\",\n \"detail\": \"No user found.\",\n \"status\": 404,\n}\n```\n",
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