The last JSON tool you will ever need.

Format, validate, convert and diff JSON. Instant, accurate and 100% private — every byte stays in your browser, never on a server.

✓No upload · No data sent · Works offline after first visit

JSON Tools

Beautify and format JSON with indentation

Find syntax errors with line and column numbers

Compress JSON and see exact bytes saved

Export arrays to spreadsheet-ready CSV

Human-readable config format, bidirectional

Well-formed XML with configurable root tag

Compare two JSON objects, see differences

Decode tokens, check expiry, inspect claims

⚡

Every tool processes JSON in your browser using native APIs. No upload spinner, no loading state. Format a 5 MB file in under 100 ms.

🔒

Your JSON never leaves your browser. No telemetry on the contents. Paste production secrets without worry — we literally cannot see them.

✦

All processing runs entirely in your browser. Works offline after the first visit — no server, no backend, no data ever transmitted.