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Validate, format, and beautify your JSON data with detailed error reporting and syntax highlighting.
Paste your JSON data or upload a .json file for validation.
The validator checks syntax, structure, and formatting in real-time.
See detailed error messages with line numbers and suggestions for fixes.
Beautify your JSON with custom indentation and copy the formatted result.
Instant syntax checking as you type with live error highlighting.
Precise error messages with line numbers and column positions.
Beautify JSON with customizable indentation (2, 4, or 8 spaces).
Upload .json files for validation and formatting.
All validation happens in your browser — no data sent to servers.
The validator detects missing brackets, trailing commas, unquoted keys, invalid escape sequences, duplicate keys, and all syntax errors defined by the JSON specification.
Yes, the validator handles large JSON files efficiently. Processing happens in your browser, so performance depends on your device.
Yes, paste minified JSON and the formatter will beautify it with proper indentation and line breaks.