JWT Decoder

Decode JWT headers and payloads locally and inspect time-based claims such as expiration

JWTs are processed locally and never sent to a server. Avoid pasting production tokens on a shared device.

This tool only decodes token contents. It does not verify the signature. Never use the displayed data alone for authentication or authorization decisions.

JWT

About this tool

The JWT Decoder reads a token's header and payload and explains its iat, nbf, and exp time claims without sending the token to a server. It intentionally does not verify the signature, so decoded claims must not be treated as trusted data.

Common use cases

Inspect claims returned by an OAuth or OpenID Connect flow while debugging an integration.
Check whether a development token is expired or not yet valid.
Confirm audience, issuer, subject, and custom claims during API development.
Format a compact JWT payload as readable JSON for a local troubleshooting session.