JWT Encoder/Decoder

A JWT (JSON Web Token) is a compact, self-contained token used for securely transmitting information between parties in a JSON format.

A JWT has three parts:

Header – Contains metadata (e.g., type of token, hashing algorithm).
Payload – Contains claims (user data, permissions, etc.).
Signature – Ensures the token’s integrity and security.

JWT encoding converts JSON data into a Base64Url-encoded token, which is then cryptographically signed using a secret key or private/public key pair.

You can decode a JWT using a JWT Decoder, which extracts and displays the readable JSON payload without requiring a secret key.

No, decoding only extracts data. Verification ensures the JWT’s signature is valid and hasn’t been altered.

Use a JWT Decoder with verification support to check if the signature is correctly signed using a known secret or public key.

No, JWTs are signed but not encrypted by default. They can be read by anyone if not encrypted, so they should never contain sensitive data.

Yes, JWTs can have an expiration time (exp claim) that makes them invalid after a specific period.