NextJS

To secure the authentication used by NextAuth, you need an HMAC-SHA512 or HS512 encryption key.

Generate your secret key with the following command:

npm run --silent nextjs:generate:secret

Once you've got your new key, edit the value of NEXTAUTH_SECRET.

Example:

NEXTAUTH_SECRET=V+P8sohr9JRtRooeyApVtc8ywDpUStqAdr0aq56eAJhiqflWQjcko2Ihs56/4JiSkFWdeL9GuWY7VgI5RFpEhQ==

In order to indicate the domain URL that you use for your website, you need to set the NEXTAUTH_URL.

NEXTAUTH_URL=http://localhost:3000

Example:

NEXTAUTH_URL=https://bildap.co

Remember that it's important for security of your website to use httpsinstead of http.