JSON Formatter & Validator
Format, validate, minify, compare, and explore JSON. All in your browser.
Indent:
Paste JSON above or click Load Sample to get started.
Free online JSON tools
- JSON Formatter — pretty-print JSON with configurable indentation (2 spaces, 4 spaces, or tabs)
- JSON Validator — check if your JSON is valid with detailed error messages and line numbers
- JSON Minifier — compress JSON to minimal size with before/after comparison
- JSON Diff — compare two JSON documents side-by-side and see added, removed, and changed keys
- JSON Tree Viewer — explore JSON structure with a collapsible tree visualization
Why developers choose this tool
- No sign-up — works instantly, no account needed
- Privacy-first — all processing happens in your browser, nothing is sent to a server
- Copy to clipboard — one-click copy on all outputs
- Syntax highlighting — color-coded output for easy reading