JSON Tidy — Formatter & Validator

Format, validate, and minify JSON instantly. Syntax highlighting, error detection, tree view. Fast, offline, privacy-first.

{} JSON Tidy — The fastest way to work with JSON in your browser. Paste messy JSON, get beautiful formatted output with syntax highlighting. Zero dependencies, 100% offline. ✨ FEATURES: • ✅ Real-time validation with error position detection • 🎨 One-click formatting with syntax highlighting (keys, strings, numbers, booleans, null) • 📦 One-click minification — remove all whitespace • 📋 Copy formatted or minified output to clipboard • 💾 Auto-save — your JSON persists when you close and reopen • ⌨️ Tab key inserts spaces, not focus change • 📊 Shows character count, line count, and byte size 💡 PERFECT FOR: • API developers inspecting JSON responses • Frontend developers debugging data • Backend developers formatting config files • Anyone working with JSON data 🔐 PRIVACY: 100% offline. No servers, no data leaves your browser. Only uses storage to remember your last JSON.