Nick demonstrates implementing JWT (JSON Web Token) authentication in .NET applications, focusing not just on simple integration but also on more advanced scenarios with third-party services like AWS Cognito. He covers how to generate and validate JWTs, using AWS Cognito for user management and token generation, and integrating this with a .NET API to secure endpoints. Additionally, examples include setting up Cognito user pools and handling both basic token validation and more complex authentication flows.

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