Your files stay on your device

Validate JSON

Paste a document, get the exact lines where it breaks, then walk the tree. Strict JSON or JSONC, nothing uploaded.

You paste
Paste, drop a JSON file, or type
Inspect

Paste JSON to see diagnostics, the tree, and line-level stats.

Diagnostics and the tree appear here
Paste, drop, or type to begin. Everything stays on this device.

More JSON tools

All JSON tools