JWT Decoder
Decode and inspect JWT tokens — runs entirely in your browser, nothing is sent to any server.
What is a JWT?
JSON Web Token (JWT) is a compact, URL-safe way to represent claims between two parties. It consists of three base64url-encoded parts: header, payload, and signature — separated by dots.
How to use
- Paste your JWT token in the input above
- The token is decoded instantly — no button needed
- Inspect header, payload, and timing fields
- Copy individual sections as formatted JSON
Privacy & security
Decoding happens entirely in your browser using the Web Crypto API. Your token is never sent to any server. Do not paste tokens containing sensitive production secrets into any online tool — including this one — if they have not expired.