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JSON Formatter & Validator
Beautify, minify and validate JSON
Everything runs locally in your browser. Your data never leaves your device.
About this tool
Paste any JSON to instantly format it with readable indentation, minify it to a single line, or validate its structure. Errors are reported with a clear message so you can spot the problem quickly. Useful for debugging API responses, config files and logs.
Frequently asked questions
Is my JSON sent to a server?
No. All formatting and validation happens locally in your browser, so sensitive payloads never leave your device.
What indentation options are available?
You can format with 2 spaces, 4 spaces or tabs, or minify the JSON to remove all whitespace.