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Learn how to effectively pass additional user data to the session in Next-Auth while implementing OTP authentication in your Next.js application.
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This video is based on the question https://stackoverflow.com/q/71185287/ asked by the user 'A.Anvarbekov' ( https://stackoverflow.com/u/16945230/ ) and on the answer https://stackoverflow.com/a/71202592/ provided by the user 'A.Anvarbekov' ( https://stackoverflow.com/u/16945230/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Pass More Data to Session in Next-Auth: A Comprehensive Guide

When building an authentication system, especially one that involves OTP (One Time Password) authentication, handling user sessions efficiently is key. If you're using Next.js with Next-Auth for your authentication flow, you might find yourself needing to pass additional user data to sessions. This guide will outline the problem and provide you with a step-by-step guide on how to achieve this.

Understanding the Problem

In your application, users input their phone numbers to receive an OTP. After they enter their OTP, you want to verify that it matches the one you sent them. If it does, you provide them with their account credentials, such as tokens and user IDs. The challenge is to persist this information in the session using Next-Auth.

Here's a brief overview of how this process typically works:

User enters phone number and receives an OTP.

The user submits the OTP for verification.

Upon successful verification, user information (like tokens) should be saved in the session.

In your current implementation, you discovered that returning the user_needs object from the authorize callback did not successfully carry over to the session callback.

Solution Overview

To successfully pass additional user data through your Next-Auth implementation, you can utilize the jwt callback. This callback sits between the authorize callback and the session callback. It allows you to intercept and modify the token that will eventually be passed to the session.

Here’s how you can set it up:

Step 1: Modify the authorize Callback

Here, you will obtain user information from your data source after validating the OTP:

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Step 2: Implement the jwt Callback

The jwt callback retrieves the user object returned from the previous authorize callback. You can then enrich the token with this user data.

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Update the session Callback

Finally, in the session callback function, you can pass the token (which now includes the user data) to the session:

[[See Video to Reveal this Text or Code Snippet]]

Complete Example

Here’s how the full implementation looks using Next-Auth:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

Understanding the flow of data through authorize, jwt, and session callbacks is critical for managing user sessions effectively when using Next-Auth. With this setup, you can pass additional user data seamlessly to the session, enhancing your application's authentication experience.

If you have any further questions or additional steps you need help with, feel free to reach out!