How can I implement authentication in my Next.js app using NextAuth callbacks?

How can I implement authentication in my Next.js app using NextAuth callbacks?

You can implement authentication in your Next.js app using NextAuth by configuring callbacks in your NextAuth options. Callbacks allow you to customize the behavior of the authentication process.

What specific callbacks can I use with NextAuth?

NextAuth provides several callbacks like signIn, redirect, session, and jwt. Each serves a different purpose, such as controlling sign-in behavior or modifying session data.

Can you give me an example of a signIn callback?

Sure! Here's a simple example:

callbacks: {
  async signIn(user, account, profile) {
    // Add your custom sign-in logic here
    return true; // Return true to allow sign-in
  }
}

How do I handle errors during authentication?

You can handle errors in the signIn callback by returning false or throwing an error. This will prevent the user from signing in and you can display an error message accordingly.