Home > Error > 400

Bad Request

Your browser sent a request that this server could not understand.

This is usually caused by a malformed URL, missing or invalid parameters, or a payload that does not conform to the expected format. The request was rejected before any application logic ran — no records were created or modified.

Possible causes

Request URL contains invalid characters or malformed query string
Required header is missing (e.g. Content-Type, Host, Authorization)
Request body is not valid JSON / XML / form-encoded data
A required field is missing from the request body
A field value violates a constraint (length, type, range, enum)
Multipart form is incorrectly delimited or has corrupt boundaries
Cookie header contains invalid characters

Example of a malformed payload

// expected schema requires: email (string), age (number), role (enum)
{
  "email": "not-an@email",  // invalid email format
  "age": "thirty",  // expected number, got string
  "role": "super-admin"// value not in enum [user, admin]
}

Correct vs incorrect

✗ Bad

{
  "email": "user@",
  "age": "30",
  "role": "X"
}

✓ Good

{
  "email": "u@a.io",
  "age": 30,
  "role": "admin"
}

Common validation rules

Field	Rule	Example
email	RFC 5322	user@example.com
age	integer 0-150	34
role	enum	user / admin
created_at	ISO 8601	2026-05-19T14:18Z
tags	array max 8	["a","b"]

Request information

Status:400 Bad Request

Method:POST

Request URI:/api/v2/users

Content-Type:application/json

Content-Length:148

Request ID:req_8a92-bb04-cc01

Schema:users.v2.json

Time:Tue, 19 May 2026 14:18:02 GMT

How to fix this

Verify each field against the API documentation
Use a JSON validator to check payload syntax
Check that the Content-Type header matches the body format
Try again after correcting the errors
Contact support with the request ID if the issue persists

Tip: If you are a developer, the API reference documents the expected format for each endpoint, including the full JSON Schema for every payload.

Home API docs Sitemap Help Contact

nginx — server — running on Linux — IPv4/IPv6