Does it validate JSON?

Yes. If your JSON is invalid, the tool shows the error message explaining what's wrong.

What indentation does it use?

It uses 2-space indentation, which is the most common standard for JSON.

It can handle JSON up to several megabytes. For very large files, performance depends on your browser.

Yes. JavaScript's JSON.stringify preserves the insertion order of object keys.

Developer Tools

Format and pretty-print JSON with proper indentation.

100% client-side — your text never leaves your browser

Input

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Output

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Paste your JSON (minified or messy) into the input.
The JSON is parsed, validated, and pretty-printed with 2-space indentation.
Copy the formatted JSON. If the JSON is invalid, an error message shows what went wrong.