HTTP 400 Bad Request

Common causes and fixes

• Check the JSON or form body, headers, and URL encoding.
• Look at the response body: APIs usually say what is wrong.

Example response

HTTP/1.1 400 Bad Request
Content-Type: application/json; charset=utf-8

{ "error": "Bad Request" }

Look up the headers shown here in the HTTP headers reference.

Common questions

What does HTTP 400 mean?

Bad Request. The server can't understand the request because it is malformed.

How do I fix a 400 error?

Check the JSON or form body, headers, and URL encoding. Look at the response body: APIs usually say what is wrong.

Is 400 an error?

Yes. 4xx codes are client errors: The request contains a mistake or can't be fulfilled as sent.

Other 4xx codes