JSON Tools

Format, validate, minify and query JSON entirely in your browser. Powered by Rust and WebAssembly for exact number fidelity — no upload, no server.

Files never leave your device

JSON Formatter & Validator

Pretty-print, minify and sort keys with byte-exact numbers and duplicate-key warnings.

Run real jq filters on your JSON with a pure-Rust jq engine.

JSON Schema Validator

Check a JSON document against a schema and see exactly which value failed which rule.

JSON to JSON Schema

Turn a sample document into a schema you can edit, then validate against it.