JSON Formatter

Fast JSON formatter with large file support, code generation, diff and history. Works in a persistent Side Panel.

JSON Formatter — the fast JSON tool developers actually keep open. Free formatters break at 5 MB. This one handles 50 MB+ JSON payloads smoothly, with a persistent Side Panel that stays out of the way while you work. ━━━ FREE FOREVER ━━━ • Format & validate any JSON up to 5 MB • Collapsible tree view with syntax highlighting • Full-text search (Ctrl+F) with match navigation • JSONPath queries — jump straight to any node • Edit values in place — double-click to change • One-click code generation — TypeScript, Go, Java (Lombok),Python, C# from any JSON • Recent history — last 10 JSONs auto-saved locally • Side Panel or full-tab mode (your choice) • Auto-detects JSON pages and offers a "Format" floating button ━━━ PRO UPGRADE ━━━ • 🚀 Large files — 50 MB+ JSON parsed in seconds, no browser freezes • 🔀 Side-by-side JSON diff — GitHub-style +/- highlighting • 📚 Unlimited history + ★ favorites — star important entries so they never rotate out • One-time $38.99 lifetime, or $16.99 / year ━━━ PRIVACY ━━━ All parsing, formatting, editing, and history happens locally in your browser. Your JSON never leaves your machine. Only the license key you paste is sent — once — to Whop to verify your Pro purchase. ━━━ WHY THIS EXTENSION ━━━ Built by a developer who spent too much time waiting for JSON viewers to load API dumps. If your workflow includes debugging APIs, comparing payloads, or generating types from JSON — this is meant for you. Works in Chrome and Edge. All processing is local. No account, no signup, no server round-trips.