7/7/2023 0 Comments Golang decode jwt![]() Token Signing is probably the most challenging part for a JWT authentication system to understand. While we have an identity and some very minimal permissions data, we need a way to validate that data to ensure it is not modified by our users to try and get more access. So now we have auth, right? Can I take this data with the user and roles and pass it between services? Well, not quite. ![]() Also, this encoding is not something we will ever have to write in our code because our upstream library will handle it. But remember, this is not encrypted, just encoded. If we were to then base64 encode the sample payload above, and we would get something like this:ĮyJhdWQiOiJhcGkiLCJleHAiOjE2NDI5ODIzMzYsImlhdCI6MTY0Mjk4MjI3NiwiaXNzIjoiaHR0cDovL2xvY2FsaG9zdDo4MDgxIiwibmJmIjoxNjQyOTgyMjc2LCJyb2xlcyI6WyJhZG1pbiIsImJhc2ljIl0sInVzZXIiOiJhZG1pbiJ9Īgain, the same data just condensed down. So over large payloads could cause excessive memory and network use. It would be best if you were wary of creating overly large payloads because we will store and pass them for each request. Although it is worth noting that you should not put secrets in the payload because JWTs are not encrypted. But you can put anything else you want in this payload. We will only focus on user and roles claims for the rest of this article and in all our code. This is where we can add custom functionality on top of JWTs in our auth system. Or what the JWT world calls private claims. But here, you can see the beneficial part of our JWT, our custom fields. There are some common fields like aud(audience), exp (expire), iat (issued at), and nbf (not before). Now we are getting somewhere! While this does have some more standardized three-character keys, there is also much more complex data. The other two fields will be handled automatically by our upstream JWT library.Īn example raw HEADER might look something like this: If that seems like a lot to manage, don’t worry! We won’t have to deal with anything but the PAYLOAD directly.
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