JWT Decoder

The JWT Decoder splits a JSON Web Token into its header and payload and presents the claims in readable form, converting timestamp fields such as expiry and issued-at into human-friendly dates and flagging whether the token has already expired. You simply paste a token and immediately see what it actually contains.

Developers debugging authentication flows use it constantly to confirm a token's claims, check its validity window and understand why a request is being rejected, all without writing throwaway code. The tool decodes the token but does not verify its signature, which still requires the signing secret or public key on your server.

Decoding happens entirely in your browser, so the token never leaves your device — which is important, because a JWT should be treated with the same care as a password. There is no install and no account, keeping inspection quick, convenient and private even when you are working with production tokens.