100% Free · No Signup · Private
JSON Formatter
Format, validate, beautify and minify JSON instantly — free, private, entirely in your browser.
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Why format JSON
Minified JSON is efficient for machines but hard to debug by eye. Beautifying re-indents nested objects and arrays so you can see structure at a glance — essential when debugging an API response or editing a config file by hand.
Frequently asked questions
No, all formatting and validation happens locally in your browser using JavaScript's built-in JSON parser.
The tool displays an error message describing what is wrong and roughly where the issue is in your JSON.