I am having trouble making progress with JWT authentication.

I created an API in Node.js called api-disfrutaparaguay: https://github.com/rafaelpalma88/api-disfrutaparaguay. In this API, we can create a user:

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After this I can do a login and get a JWT Token:

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But, my first question is that i suppose my JWT is not signed. When u try at jwt.io website the signature is not working well:

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You can see my configs here:

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src/app.ts

But, you can see that it is working well in my website:

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