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Learn how to efficiently provide user feedback during long-running processes in Next.js using server-sent events and streaming.
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Providing Sequential User Feedback in Long-Running Next.js Processes

In today's fast-paced web application landscape, providing users with timely feedback is critical, especially during long-running processes that can take up to 30 seconds or more. In this post, we'll explore how to convey real-time updates to users in a Next.js application when dealing with multiple external APIs. By leveraging server-sent events (SSE), you can enhance user experience while maintaining a clean architecture.

The Problem

When you're running a process that involves multiple sequential tasks, it's essential for users to know the status of the operation. In our scenario, the ideal feedback would look something like this:

Processing task 1

Processing task 2

Processing task 3

Finished (with data callback)

While working on this functionality, you might have attempted using regular streaming but found that the responses were logged all at once rather than sequentially. Alternatively, you could break the subprocesses into separate API routes and call them sequentially, but that could overcomplicate your application logic.

The Solution: Server-Sent Events

To effectively provide the sequential feedback you're looking for, we can use server-sent events. Here's a step-by-step guide to implementing this solution in your Next.js application.

Step 1: Setting Up the API Route

First, we need to create the server-side logic that will send updates to our client. Below is an example of how to set up an API endpoint using SSE:

pages/api/endpoint.ts

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

Step 2: Creating the Client Component

Next, we need to put together the client-side component that will receive updates from the server.

Example of a Client Component

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

Step 3: Integrating the Component in Your Application

You can now integrate the ClientComponent into your Next.js application wherever you wish to display the progress updates. This layout encourages users to stay informed on the task at hand.

Conclusion

Using server-sent events in Next.js allows you to provide real-time user feedback during long-running API processes without much complexity. With the basic framework and examples provided, you're now equipped to implement sequential user feedback for your applications in a clean and efficient manner.

Feel free to customize the responses and interval timing as per your application needs, and enjoy a smoother user experience!