JSON Formatter

Format, validate, and minify JSON. Catches syntax errors with line + column.

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Your files never leave your device
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Everything runs in your browser — nothing is uploaded.
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Format, validate, and explore JSON instantly. Beautify or minify, browse a collapsible tree, sort keys, auto-repair broken JSON, and convert to TypeScript types or YAML — all locally, with precise error messages when something’s off.

How to use JSON Formatter

  1. 1Paste, type, or drop a .json file into the input.
  2. 2See it validated live, with the exact line and column of any error.
  3. 3Switch between Text and Tree views, beautify, minify, or sort keys.
  4. 4Copy the result, download it, or convert to TypeScript / YAML.

Frequently asked questions

Often, yes. Hit “Repair” and it removes trailing or duplicate commas, strips comments, converts single quotes to double quotes, and quotes unquoted keys. It also lists every problem it finds with line and column numbers.
Yes. The Tree view shows a collapsible structure with type colors and counts, a search box to find any key or value, expand/collapse-all, and one-click copy of a value or its JSON path.
Yes — the Convert menu generates TypeScript interfaces from your JSON, and can also output YAML.
No. Everything runs entirely inside your browser using your own device — your files never leave your computer or get uploaded anywhere. That makes it private and fast, even for large files.
Yes, completely free with no sign-up, no watermark, and no daily limits. Use it as much as you like.

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