Go (Golang) JWT Authentication Tutorial

Go (Golang) JWT Authentication Tutorial

In this episode we are going to implement JWT authentication for an endpoint in our JSON REST APIs which we have seen in our previous episode. Go (Golang) JWT Authentication Tutorial.

Go (Golang) JWT Authentication Tutorial

In this episode we are going to implement JWT authentication for an endpoint in our JSON REST APIs which we have seen in our previous episode πŸ‘‰ https://www.youtube.com/watch?v=8S30eoBSojU

We are going to:

  • See how the JWT is structured (header, payload, signature)
  • Different Algorithms that can be used (HMAC-based, RSA, ECDSA)
  • Implement a "auth" endpoint which generates a JWT
  • Implement a "authorizer" handler which verifies a provided JWT token and ensures only authenticated users can access that handler

JWT is a fantastic standard that allows us to verify users (or anything for that matter) in a stateless way. Once the user has been firstly identifier and issued a token, any further request coming from the user carrying the JWT token will be verified without having to check the database or any other authentication system, we can just verify the authenticity of the token to verify the user.

JWT (JSON Web Token) Wiki - https://en.wikipedia.org/wiki/JSON_Web_Token Official JWT Spec (lots of details here) - https://tools.ietf.org/html/rfc7519 JWT Algorithms Overview by Auth0 - https://auth0.com/blog/json-web-token-signing-algorithms-overview/

Source Code - https://play.golang.org/p/PZZ9c6nwVrs Go JWT Library used - https://pkg.go.dev/github.com/dgrijalva/jwt-go

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golang go jwt authentication

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