Implement JWT Auth

Step-by-step guide to implement JWT in Node.js.

SCENARIO

Guide me through implementing JWT authentication in an Express.js application, including generating tokens, middleware for verification, and secure storage practices.

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Authentication

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NextAuth Implementation

Setup NextAuth with Google Provider.

How do I set up NextAuth.js in a Next.js App Router project using Google as a provider? Please provide the code for route.ts and the needed environment variables.