JWT tokens are used very often for authentication purposes.
Let’s try to get information encoded in tokens.
Let’s asume we’ve got an JWT authentication token from some authentication service.
It might look like
Structure of JWT authentication token
There is the information encoded in the JWT token.
If you go to jwt.io to get the content of the JWT token you’ll see in the “PAYLOAD: DATA” section
Decode JWT token.
Our goal is to get that information from a JWT token programmatically in Java code.
Here we use Base64 decoding to decode JWT
jsonString variable contains the JSON string we’re looking for.
So now we know the structure of the JWT authentication token. Knowing that we can create the class
Decode JWT token. Usage example
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