Free browser tool
JSON Formatter and Validator
Paste JSON to check it is valid and see it neatly indented, minified or with keys sorted, as you type. Errors show the line and column. Your data stays on your device.
Built with love by Shushant Lakhyani. Building bestproductivityresources.com
Valid JSON. Object with 4 keys, 181 characters.
Checks against the JSON standard (RFC 8259) using your browser's own parser, so comments, trailing commas and single quotes are reported as errors. If a key appears twice, the last value wins, and numbers beyond about 15 to 17 significant digits lose precision, as in JavaScript. Avoid pasting secrets you would not want on screen.
Built with love by Shushant Lakhyani. Building bestproductivityresources.com
Private by design. This tool runs entirely in your browser. Nothing you enter or select is uploaded, saved, logged or shared, no AI service is used, and closing the tab clears everything.
Disclaimer. This free tool is provided "as is", without warranties of any kind, for general information and convenience. You use it at your own risk. See the Disclaimer, Terms of Use and Privacy Policy.
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