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JSON Formatter & Validator

Paste messy or minified JSON below to instantly format, validate, and beautify it — entirely in your browser.

Runs in your browser · No data uploaded

About this tool

A JSON formatter takes raw, minified, or poorly indented JSON and rewrites it with proper indentation and line breaks, making it readable. It also validates the JSON syntax and points out errors like missing commas or unmatched brackets.

FAQ

No. All formatting and validation happens locally in your browser using JavaScript — your data never leaves your device.

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