100% client-side · your data never leaves the browser
Developer Toolkit
Decode JWT tokens, inspect authentication payloads, encode/decode Base64 data, and format JSON — all in one fast, modern workspace.
No tracking JWT claims & expiry Instant formatting
Decode and inspect JSON Web Tokens with expiry checks.
Encoded token
Paste a JWT. Everything is decoded locally — nothing leaves your browser.
Decoded header, payload and claims will appear here.