Input JSON
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Result
Free Online JSON Validator
Use this free JSON validator to check if your JSON is valid. Get instant feedback with exact error location — line number, column, and description. Perfect for debugging API responses, config files, and data payloads.
What is JSON Validation?
JSON validation checks that your text follows the JSON specification (RFC 8259). A JSON checker identifies syntax errors like missing quotes, trailing commas, single quotes, and unescaped characters. This JSON lint tool validates instantly as you type.
Common JSON Errors
- Missing double quotes around keys
- Trailing commas after last item
- Single quotes instead of double quotes
- Unescaped special characters in strings
- Missing colons or commas between elements
Why Use Our JSON Validator?
- Instant validation as you type
- Exact error line and column number
- Clear, human-readable error messages
- Highlights the error line visually
- 100% client-side — your data stays private
- No signup, no limits, completely free
Related Tools
After validating, use our JSON Beautifier to format your JSON, or switch to Tree View to explore the structure visually.