Input
Enter valid JSON on the left to visualize
Local · No upload · No signup
Free Online JSON Formatter & Validator
Beautify · Validate · Minify · Escape · Repair · Tree View — all in your browser
No upload, no storage
JSON is processed in memory and never sent to a server.
Share via URL fragment
Share links encode data in the # anchor — never sent to a server.
Remember last edit
Optionally keep your last input locally; clear it with one click.
Features
Beautify & Pretty-Print
Indent and highlight messy JSON into a clean, readable structure.
Validate JSON & Find Errors
Real-time validation with exact line, column and a human-readable reason.
Minify / Compress JSON
Strip all whitespace for the smallest possible payload.
Escape & Unescape JSON
Convert between escaped string form and raw JSON.
Repair & Fix Broken JSON
Auto-fix quotes, trailing commas and typos — every change listed.
Runs Locally — No Upload
Runs entirely in your browser; sensitive data stays on your machine.
FAQ
No. JSONfree is fully client-side; your JSON is processed locally and never uploaded or stored.
Paste it on the left and click Repair to preview fixes, or read the line/column error to fix it manually.
Completely free, no signup, no ads, no limits.