JSON Validator
Validate JSON data and find errors with line numbers instantly.
Documentation
JSON validation checks whether your data follows the correct JSON syntax rules. It catches errors before they cause problems in your application.
Invalid JSON can crash apps, break API calls, and cause config errors. Validating first saves debugging time.
- 1) Paste your JSON data into the input box.
- 2) Click Validate to check for errors.
- 3) Review the result — valid or error with details.
FAQs
A JSON validator checks whether your JSON data is syntactically correct and reports errors with exact line numbers.
Common errors include missing commas, unclosed brackets, trailing commas, unquoted keys, and incorrect string values.
No. All validation happens locally in your browser. Your data is never uploaded or stored.
Yes. The JSON validator is completely free with no signup or limits.
Validation checks if JSON is correct. Formatting makes valid JSON readable by adding indentation. This tool does both.