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JSON Formatter & Beautifier

Format, beautify and pretty-print JSON with your choice of indentation, and pinpoint syntax errors.

  1. Paste your input
  2. Choose the options
  3. Copy the output
Runs in your browser. Your data and files never leave your device.

About the JSON Formatter & Beautifier

Paste JSON to format it with consistent indentation so it’s easy to read, or sort keys alphabetically to compare objects. If the JSON is invalid, you’ll see what’s wrong and the line and column where it happened.

Everything runs in your browser — API responses, config files and tokens you paste never leave your device.

Frequently asked questions

Why is my JSON invalid?

The most common causes are single quotes instead of double quotes, a trailing comma after the last item, unquoted keys, and comments (which JSON doesn’t allow).

Is there a size limit?

It’s limited only by your browser’s memory; files of several megabytes format in well under a second.

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