JSON Processing
Made Simple & Fast
Formatter, validator, converter (JSON↔YAML↔XML↔CSV), JWT decoder/encoder/verifier, Base64, diff, path queries, and more. All in your browser — 100% client-side.
100% Client-Side
All processing happens in your browser. Nothing is sent to any server.
Blazing Fast
Built with Next.js and optimized for instant response times.
Free & Open
All tools are completely free with no usage limits.
Developer First
Built by developers, for developers. Clean, professional UI.
Try It Now
Format JSON or decode JWT instantly
All Tools
Everything you need to work with JSON and JWT
JSON Formatter
Beautify, validate & minify JSON
JSON ↔ YAML
Convert between JSON and YAML
JSON ↔ XML
Convert between JSON and XML
JSON ↔ CSV
Convert between JSON and CSV
Base64 Encode/Decode
Encode & decode Base64 strings
JSON Diff
Compare two JSON objects
JSONPath Query
Query JSON with JSONPath expressions
JSON Escape/Unescape
Escape or unescape JSON strings
JSON Schema Generator
Generate JSON Schema from JSON
JSON → TypeScript
Generate TypeScript interfaces from JSON
JSON Sorter
Sort JSON keys alphabetically
JWT Encoder
Create & encode JWT tokens
JWT Verifier
Verify JWT signatures
Start Using JSONLab Today
Free, fast, and private. All tools work offline — nothing leaves your machine.