Instant JWT Inspector & Decoder
Decode JSON Web Tokens locally to inspect header and payload claims securely.
STEP 1
Paste your encoded JWT string into the input.
STEP 2
The tool splits and decodes base64url segments.
STEP 3
Inspect header, payload claims, and expiration.
ENCODED JWT TOKEN
HEADER
PAYLOAD
Ready
Why Use JustJWT?
Debugging authorization headers requires verifying token claims like expiration dates (`exp`) and subject IDs (`sub`). JustJWT runs entirely client-side, ensuring your authentication tokens are never leaked or logged to external servers.