JSON Validator
Validate JSON syntax instantly. Get clear error messages for invalid JSON. Free.
How to use this tool
- Enter json to validate in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your validation result and the full breakdown beneath it.
JSON Validator checks your JSON string for syntax errors and tells you exactly what went wrong.
Frequently asked questions
- What makes JSON invalid?
- Common JSON errors include trailing commas, unquoted keys, single-quoted strings, and missing brackets.