JSON Formatter & Validator

Format, beautify, and validate your JSON with clear error messages.

Input JSON

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Formatted Output

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Indentation

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Frequently Asked Questions

This tool formats (beautifies) JSON with proper indentation and validates its syntax, showing clear error messages if the JSON is invalid.

The validator detects syntax errors like missing quotes, unbalanced brackets, trailing commas, and invalid values. Error messages include the approximate location of the problem.

Yes! All processing happens directly in your browser. Your data never leaves your device.