How to Implement Google Authentication in Next.js with FastAPI or Node.js (Step-by-Step)

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In this guide, we’ll walk through integrating Google Authentication into a Next.js application using FastAPI as a backend. Google OAuth is a popular choice for user authentication, providing a secure and streamlined experience by allowing users to log in with their Google account. This tutorial will help you add Google OAuth login to your Next.js app step-by-step, making it a robust feature for any web application.

Why Use Google Authentication in Your Next.js App?

Adding Google authentication to your Next.js app improves user convenience and security by leveraging Google’s secure login system. With Google’s OAuth 2.0, users can log in with a few clicks, enhancing their experience and building trust. This feature can be particularly valuable for applications requiring authenticated access, such as dashboards, e-commerce platforms, and social networks.

Table of Contents

1. Prerequisites
2. Setting Up Google Cloud Project and OAuth Credentials
3. Building the Next.js Frontend with Google Login
4. Creating a FastAPI Backend for Google Authentication
5. Testing and Final Touches