JSON Validator
Paste your JSON and instantly know if it's valid. Error messages tell you exactly where the problem is. All processing runs in your browser.
FORMAT
Tips
Paste JSON in the left pane. Output updates instantly.
How it works
Validation feeds your input to JSON.parse. If the parse succeeds, the JSON is syntactically correct and a confirmation appears. If it throws a SyntaxError, the message from the browser's engine is surfaced verbatim, including the position of the offending character so you can jump straight to the problem (trailing comma, unbalanced bracket, unquoted key, and similar).
Processing runs in your browser
All processing happens inside your browser tab. Our servers are not involved at any point.
Related operations
For converting between data formats, try CSV to JSON or the YAML formatter. To decode tokens, use the JWT decoder. For escaping URL data, try URL encode.
Frequently asked questions
- What does JSON validation check?
- It checks that your JSON is syntactically correct, properly quoted keys, no trailing commas, balanced brackets, etc.
- Does it check JSON Schema?
- Not currently, this tool validates syntax only, not a schema or data contract.
- Is my data private?
- Yes. Validation uses JSON.parse in your browser. Our servers are not involved at any point.