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4xx · Client Error

400Bad Request

The server cannot or will not process the request due to a client error.

What is HTTP 400?

The 400 Bad Request status means the server cannot process the request due to invalid syntax or malformed request. The client should not repeat the request without modifications.

Example

POST /api/users with malformed JSON → 400 Bad Request

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Common Use Cases

  • Invalid JSON body
  • Missing required parameters
  • Invalid query string format

Quick Facts

Code400
Category4xx
TypeClient Error

Related 4xx Codes

401403404405408409