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JSON Toolbox- Free online JSON tools

JSON Beautifier

Beautify JSON online instantly. Turn compact or messy JSON into clean, readable output with your preferred indentation.

  • 100% client-side, nothing uploaded
  • Instant results
  • Works offline once loaded
Input JSON

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Beautified JSON

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How it works

About this tool

This free online JSON beautifier pretty-prints your JSON as you type. Paste minified or poorly formatted JSON on the left and get a clean, consistently indented version on the right — no button to press, no page reload.

You can beautify JSON with 2 spaces, 4 spaces, or tab indentation, and optionally sort object keys alphabetically to make large documents easier to scan and compare. Invalid JSON is caught immediately with the exact line and column of the error. If you need the opposite direction, one click switches the output to minified JSON.

Everything runs locally in your browser using the native JSON engine, so beautifying is instant even for large files and your data never leaves your device.

JSON Toolbox processes all data locally in the browser. Nothing is uploaded to a server.

Common questions

Frequently asked questions

How do I beautify JSON online?
Paste your JSON into the input editor and the beautified version appears instantly in the output panel. Choose 2 spaces, 4 spaces, or tabs for indentation, optionally sort keys alphabetically, then copy or download the result.
What does a JSON beautifier do?
A JSON beautifier (also called a pretty printer) takes compact or messy JSON and reformats it with consistent indentation and line breaks, making nested objects and arrays easy to read and debug.
Does beautifying JSON change my data?
No. Beautifying only changes whitespace — every key, value, and array item stays exactly the same. If you enable key sorting, only the order of object keys changes, which has no effect on how the JSON is parsed.
Is this JSON beautifier private?
Yes. Beautification runs entirely in your browser with no server involved. Your JSON is never uploaded, so it is safe to beautify documents containing sensitive information.

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