API response invalid JSON fix
When servers return HTML error pages or truncated JSON, clients throw on parse. Always check Content-Type and validate a substring before mapping models.
Common causes
- Reverse proxy injects HTML.
- Double-encoded JSON string.
- Truncated chunked response.
How to fix
- Run API Response Analyzer on the URL.
- Use Request Body Validator on extracted JSON.
- Fail closed when body is not application/json.
Use our tool
Analyze API responseRelated