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400 Bad Request

bad_request — Bad request

Message “A required parameter is missing.”

What causes it

  • A required top-level parameter was absent from the request body or query string; `details[0].field` names it.
  • The query string could not be parsed — for example the same key sent as both a scalar and a nested hash (`filter=1&filter[status]=failed`). This variant comes from the framework with the message "The request could not be completed." and no `details`.

How to fix it

  1. Add the parameter named in `details[].field` and resend.
  2. Send filters consistently as `filter[<name>]=<value>`; never mix `filter=` with `filter[...]` in one request.
  3. Send `Content-Type: application/json` with a JSON object body for write operations.

Operations that return it

Any operation can return this code.

See the API reference for the full list of operations.

Example response

HTTP/1.1 400 Bad Request · Content-Type: application/json

400 Bad Request
{
  "error": {
    "code": "bad_request",
    "message": "A required parameter is missing.",
    "details": [
      {
        "field": "rows",
        "message": "parameter is required"
      }
    ],
    "request_id": "6f1c2a3e-8d4b-4c5e-9f0a-1b2c3d4e5f60",
    "doc_url": "https://cascades.crscreditapi.com/docs/api/errors/bad_request"
  }
}