HTTP 400Invalid request

invalid_request

The request was structurally wrong before validation even ran — malformed JSON, a missing request body where one is required, an unusable query parameter, or a malformed Idempotency-Key header.

This page is where the problem type URI https://usepostify.com/docs/api/problems/invalid-request resolves.

Common causes

  • The request body is not valid JSON (trailing comma, unquoted key, truncated payload).
  • The Content-Type header is missing or not application/json on a body-carrying request.
  • A query parameter has an unusable value — e.g. limit outside 1–100, or an unparseable cursor.

How to fix

  • Serialize the body with a JSON library rather than string concatenation.
  • Send Content-Type: application/json on every POST/PATCH.
  • Read the `detail` field — it names what was malformed.

Example response

400 · application/problem+json
{
  "type": "https://usepostify.com/docs/api/problems/invalid-request",
  "title": "Invalid request",
  "status": 400,
  "code": "invalid_request",
  "detail": "Request body is not valid JSON.",
  "request_id": "req_6f1f8a2b40d34cd2a6f1e2c9b8d7a601"
}

Related