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Toolshed

JSON Formatter

Format, validate and minify JSON, with errors shown at the exact spot.

  • No uploads
  • No limits
  • No signup
Input:
JSON
Output:
Formatted
Runs on:
Your device
Size limit:
None
Account:
Not needed

How to use JSON Formatter

  1. Paste your JSON

    Paste it into the input box. Files over 1 MB are processed in the background so the page stays smooth.

  2. Format, minify or validate

    Choose an indent, then press Format, Minify or Validate. Errors show the exact line and column.

  3. Copy or download

    Copy the result, download it as a .json file, or explore it in the tree view.

Why JSON Formatter on Toolshed

  • No uploads

    Everything runs in this browser tab. Your files never leave your device.

  • No limits

    No file-size caps, no daily quotas. Process as much as your device can handle.

  • No signup

    No account, no email, no watermark.

Frequently asked questions

How do I find the error in my JSON?

Press Validate or Format. If the JSON is invalid, the message shows the exact line and column of the first problem, such as a trailing comma or a missing quote.

Can it handle large JSON files?

Yes. Input over 1 MB is formatted in a background worker so your browser stays responsive. Everything still runs on your device.

Are my files uploaded anywhere?

No. JSON Formatter runs entirely in your browser. Your files are processed on your device and are never sent to a server.

Is there a file size limit?

No fixed limit. The only limit is your device's memory. Very large files work best in a desktop browser.

Is JSON Formatter really free?

Yes. There's no account and no watermark. A short optional ad, or a 20-second wait, unlocks each download. That's how we keep it free.

Does it work offline?

Once the page has loaded, processing happens locally, so it keeps working even if your connection drops.