Is my JSON data sent to a server?
No. All formatting and validation happens locally in your browser.
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JSON Formatter
Format and validate JSON directly in your browser.
Privacy
Tool workspace
How JSON formatting works
Paste JSON into the input field. The formatter validates syntax locally and returns JSON formatted with 2 or 4 spaces without materializing it as JavaScript values.
Use cases
Quickly format unreadable API responses or validate JSON syntax in configuration files during development.
Privacy
Your JSON data is parsed securely in your browser memory and disappears when the page reloads.
Limitations
Unsafe integer and duplicate-member tokens are preserved, but other valid numeric spellings can be normalized. Extremely large JSON files can affect performance.
JSON Formatter FAQ
Can it fix broken JSON?
It will validate the syntax and provide an error message, but it does not auto-fix broken structures.
Is the formatted JSON stored?
JSON values stay in browser memory and are not written to Kept Tools storage.
What indentation options are available?
You can format JSON with 2 spaces or 4 spaces.
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