formatmyjson.app is a free, developer-friendly JSON tool. Format messy JSON with proper indentation, validate syntax with precise error locations, minify for production, or compare two JSON documents side-by-side.

Everything runs in your browser — no data is sent to any server. Keyboard shortcuts (Ctrl+Shift+F to format, Ctrl+Shift+M to minify) make it fast for power users. No signup, no ads, no limits.