Fetching Dynamic URLs After Google Identity Services Login with TypeScript

Описание: Learn how to fetch dynamic URLs in `TypeScript` after logging in with Google Identity Services. This comprehensive guide explains the workaround and offers code snippets for better comprehension.
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Fetching Dynamic URLs After Google Identity Services Login with TypeScript

In today's guide, we will explore a common challenge faced by developers when using Google Identity Services (GIS) for authentication in modern applications. Specifically, we will focus on how to log in with GIS, extract user information, and dynamically fetch a URL that includes the user's email address. Whether you're a developer new to TypeScript or looking to refine your skills, this guide aims to provide a clear understanding of the process.

The Problem

When logging in using GIS, you might want to fetch data from an API endpoint that is user-specific. A typical scenario is needing to use the user's email to construct the endpoint URL after a successful login. However, achieving this dynamic fetching while managing user state can be a bit tricky—especially when you're just starting with TypeScript.

Here's the crux of the problem:

Goal: Fetch a URL that includes the user's email (url/${user.email}) immediately after a successful login.

Challenge: The need for the API URL to update dynamically based on authenticated user details while maintaining the login state.

The Initial Attempt

Let's briefly go over the initial approach you might have used. Here’s a summarized version of your effort:

User Initialization: You initialized a user state using a useState hook.

Handling the Callback: Upon a successful login callback from GIS, you decoded the JWT, extracted the user’s information, and stored it in local storage.

Fetching Data: In an effect hook, you attempted to fetch data from a hardcoded URL instead of dynamically generating it using the user’s email.

Here's a snippet of your initial code:

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

The Solution

You were able to solve the main problem of fetching data dynamically post-login. Let's break down the solution into manageable parts.

Step 1: Construct the Dynamic URL

Instead of embedding the user's email directly into the fetch call, store it in a separate variable. This ensures that the constructed URL is updated every time the user's email changes.

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

Step 2: Utilize the Effect Hook Properly

In the effect hook, set up the API call to trigger only when the userEmail is defined. This prevents unintended calls when the user state is still being initialized.

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

Step 3: Ensuring Persistent Login State

One outstanding issue remains—keeping the user signed in even after refreshing the page. You can manage this by checking the local storage for an existing user in a useEffect that runs on component mount. Here's an example:

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

Conclusion

By following these steps, you can fetch dynamic URLs securely in your TypeScript application after logging in with Google Identity Services. This method not only enhances the user experience but also streamlines your API interactions.

Final Thoughts

While you've made great strides in solving your initial problem, continuing to refine your authentication and data fetching strategies will significantly improve your application. Stay tuned for more posts where we delve deeper into modern authentication practices!

Feel free to share your experiences with GIS and TypeScript in the comments below. Happy coding!