Free JSON Formatter & Validator
Format, validate, and minify JSON instantly — 100% free, runs in your browser.
What is a JSON Formatter?
A JSON formatter is a tool that takes unformatted or minified JSON data and adds proper indentation and line breaks to make it readable. Also called a JSON beautifier or pretty printer, it is essential for debugging API responses, reading configuration files, and working with any JSON-based data exchange. The Verified Tools JSON formatter validates syntax errors in real time, supports both 2-space and 4-space indentation, and can minify formatted JSON to reduce file size. It features a side-by-side editor with instant feedback. Everything runs locally in your browser — your data never leaves your device.
How to Format JSON
- Paste your JSON into the left input panel (or click "Sample" for an example).
- Click "Format" to beautify with indentation, or "Minify" to compress.
- Choose between 2-space or 4-space indentation.
- Check the status indicator — green means valid JSON, red means there's a syntax error.
- Click "Copy" to copy the formatted result to your clipboard.
100% Free — No sign-up, no email, no limits. This tool runs entirely in your browser. Your data never leaves your device.