JSON Formatter & Validator
Prettify, minify, and validate JSON in your browser. Paste or load a .json file — no uploads needed.
100% In-Browser Processing. Your files never leave your device.
Input
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Output
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About this tool
JSON (JavaScript Object Notation) is the most widely used data interchange format in web development. A JSON formatter takes raw or minified JSON text and applies consistent indentation and line breaks to make it human-readable. A JSON validator checks that the JSON is syntactically correct — detecting missing commas, mismatched brackets, unquoted keys, and other common errors. These are essential daily tools for developers working with APIs, configuration files, and data pipelines.