# `request.malformed_json` — Malformed request body

**HTTP status:** 400  
**Retryable:** no — change the request or the flow first

## When it happens

The body is not valid JSON or does not match the expected shape.

## What to do

Send `Content-Type: application/json` with a body matching the API reference.

## Example response

```json
{
  "type": "https://quickota.com/developers/errors/request.malformed_json",
  "title": "Malformed request body",
  "status": 400,
  "code": "request.malformed_json",
  "detail": "The body is not valid JSON or does not match the expected shape.",
  "suggestion": "Send \u0060Content-Type: application/json\u0060 with a body matching the API reference.",
  "retryable": false,
  "requestId": "req_7f3a2c9e41d0b8a6c5e21f90"
}
```

See [Errors](https://quickota.com/developers/guides/errors) for how to handle errors in general.