JWT Decoder
Paste your JWT and instantly see its decoded header, payload, and expiration status — free, private, and processed entirely in your browser.
About the JWT Decoder
A JSON Web Token (JWT) is a compact, URL-safe way to represent claims between two parties, commonly used for authentication and authorization. Every JWT has three dot-separated parts — a Header describing the signing algorithm and token type, a Payload containing the actual claims (like user ID and expiration), and a Signature used to verify the token wasn't tampered with.
Our free online JWT decoder lets you paste a token and instantly inspect its header and payload, along with a visual analysis of its expiration status — all without exposing the token to a server. That makes it a safe way to debug claims on tokens that may contain sensitive data, since decoding happens entirely inside your browser.
How to Decode a JWT
Step 1
Paste your JWT token
Paste your encoded JWT (starting with eyJ...) into the text area, or type it directly.
Step 2
Review the token state
Instantly see whether the token is active, expired, or has no expiration, plus its algorithm.
Step 3
Read or copy the claims
Browse the decoded header and payload claims, and copy either one to your clipboard.
Frequently Asked Questions
Are my tokens safe?
Yes, decoding happens entirely client-side. The token is never sent to our servers or stored anywhere.
Can I verify the signature?
We decode the signature block to check its formatting. Full cryptographic verification requires a server-side environment and the signature key.
Why does it say "No Expiration"?
Not every JWT includes an exp claim — some tokens are designed to never expire, or expiration is enforced by other means.
Does it cost money?
No. The JWT decoder is 100% free to use, with no registration or account required.