When an API responds, it provides a numeric code to indicate the status of the request.
Status Code Illustration
Important Categories
- 2xx (Success): Success.
200 OK: Request successful.201 Created: Data successfully created (usually after POST).
- 4xx (Client Error): Error on the user side.
400 Bad Request: Invalid input data.401 Unauthorized: You are not logged in (no token).404 Not Found: URL or data not found.
- 5xx (Server Error): Error on the server side.
500 Internal Server Error: Server crash or bug in the backend code.