JWTs are often used for authentication and authorization in web applications, but their encoded format can be challenging to understand. A JWT decoder simplifies this process by breaking down the token's components.

A JWT decoder decodes the base64-encoded segments of a JWT and presents the decoded information, including the header, payload, and signature, in a readable format.

With a JWT decoder, you can extract details such as the token issuer (iss), subject (sub), expiration time (exp), issued at (iat), and any custom claims embedded within the JWT.

Yes, decoding JWT tokens is secure because it only involves parsing the token's contents without altering its integrity. However, ensure that you're decoding JWTs from trusted sources and handling sensitive information securely.

While JWT decoders primarily focus on decoding and displaying token contents, some advanced tools may offer token validation features to verify the token's signature and integrity.

JWT decoders are limited to decoding tokens encoded in the JWT format. They may not support other token formats or proprietary encryption schemes used by specific applications.

Using a JWT decoder typically involves pasting the JWT token into the tool's input field and clicking a "decode" button. The decoded information is then displayed, allowing you to inspect the token's contents.

While JWT decoders are valuable for debugging and understanding token payloads during development, exercise caution when using them in production environments, as they may expose sensitive information.

You can find JWT decoder tools online or as part of development frameworks and libraries. Ensure that you choose a reputable tool that meets your security and functionality requirements.