Client-Side JWT Decoder
A client-side JWT decoder reads the base64url header and payload in the browser. It helps inspect claims without sending the token to a remote decode API.
Runs in your browserNo uploadFree · no signup
Direct answer
Client-Side JWT Decoder is a browser-side workflow connected to JWT Decoder. It is designed for users who want a local, no-upload developer utility with static examples and FAQ content.
Input
eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiIxMjMiLCJyb2xlIjoiYWRtaW4ifQ.signature
Output
Header: {"alg":"HS256"}
Payload: {"sub":"123","role":"admin"}When to use it
- Check exp, iat and nbf claim values while debugging auth failures.
- Inspect issuer, audience and scope claims before writing a bug report.
- Create a redacted example from a token payload.
Use the interactive tool
Open JWT Decoder to run the workflow locally in your browser. This page is static HTML for search, examples and quick reference.
FAQ
Does decoding verify the JWT signature?
No. Decoding only reads the header and payload. Verification requires the issuer key and expected algorithm.
Should I paste production bearer tokens?
Avoid pasting live bearer tokens into any external page. Rotate a token if it may have been exposed.
Does the decoder upload my token?
No. The decoding logic runs in the browser.