What does 400 invalid_json mean?

The body couldn't be read as JSON, so the API never got as far as looking at your fields.

Code: invalid_json · HTTP status: 400

The Model API expects a JSON body with Content-Type: application/json.

Common causes#

• a trailing comma or a missing quote
• shell quoting that broke the body in a cURL command (single quotes inside a single-quoted -d)
• sending form data or plain text instead of JSON
• an empty body

How to fix it#

1. Validate the body with a JSON tool (python -m json.tool body.json or jq . body.json).
2. In cURL, put the body in a file and send it with -d @body.json.
3. Set Content-Type: application/json.
4. With an OpenAI SDK this error almost never happens; if it does, check any custom extra_body you pass.

Should my code retry?#

Not retryable as is: fix the body first.

The error body uses the OpenAI shape, so OpenAI SDKs raise it as an exception you can catch:

{"error": {"message": "...", "type": "...", "code": "invalid_json", "param": null}}

Every response also carries an X-Request-Id. Keep it in your logs; it's the quickest way for support to find a request.

See the full list in the Model API reference.

Still need help?#

• General support: support@clatterlabs.com or team@clatterlabs.xyz
• Infrastructure questions, or permanent deletion of your data (your whole account or one service): infrastructure@clatterlabs.xyz

We usually reply within the first hour, and always within 24 hours. A full support team is with you.