Speeding Up File Downloads: Optimize downloadZip in ReactTS with Parallel API Requests

Learn how to enhance performance in your React TS application by implementing parallel API calls for downloading multiple CSV files efficiently.
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Speeding Up File Downloads: Optimize downloadZip in ReactTS with Parallel API Requests

The Problem

Consider a scenario where you have a React TypeScript function called downloadZip that handles downloading ZIP files containing multiple CSVs. Currently, the function retrieves each CSV file sequentially through a series of API calls. This approach can considerably slow down the process, especially if one or more requests experience delays.

The Current Functionality

Here's a brief overview of the original downloadZip function you might be working with:

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

In the code above, the downloadCSV function is called one after the other, waiting for each to resolve before moving to the next.

The Solution: Parallel API Requests

Step 1: Create an Array of API Calls

Instead of making individual await calls, create an array to hold all the API calls using the downloadCSV function.

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

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

Step 3: Structure Your Response Handling

After the promises resolve, you can process the results as before:

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

Final Code Example

Here's the complete refactored downloadZip function:

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

Conclusion

Give these modifications a try in your application, and watch as response times improve, making your app feel faster and more responsive!