The fastest JWT token decoder and debugger. Inspect your JSON Web Tokens instantly and securely without sending data to a server.
All JWT decoding happens in your browser. Tokens are never sent to our servers.
JSON Web Token is a compact, URL-safe means of representing claims securely between two parties.
This tool only decodes JWTs. Signature verification requires the secret key.
See exactly what's inside your token: algorithm, claims, issuer, and expiration.
Your tokens are sensitive. We decode them locally in your browser—zero server transmission.
Instantly check if your string is a valid JWT format before debugging further.
Decode the readable parts (Header & Payload) without needing the signing secret.
Paste your JWT code.
View decoded data instantly.
Verify claims & dates.
When implementing authentication, knowing exactly what's in your token is crucial. Check for typos in claims, verify correct role assignments, and ensure the token hasn't expired—all in seconds.
A JWT consists of three parts: Header, Payload, and Signature. Our tool visually separates these components, helping you understand how data is encoded and signed in modern web applications.