How to Iteratively Store Multiple API Calls into a useState Array in React

Описание: Discover the best practices for handling multiple API calls in React with `useState`. Learn how to avoid glitches and store responses efficiently!
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This video is based on the question https://stackoverflow.com/q/69535173/ asked by the user 'subprimeloads' ( https://stackoverflow.com/u/13424118/ ) and on the answer https://stackoverflow.com/a/69539560/ provided by the user 'nima' ( https://stackoverflow.com/u/5737950/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Iteratively Store Multiple API Calls into a useState Array in React

React is a powerful library for building user interfaces; however, managing API calls, particularly when dealing with multiple requests, can pose challenges. One common scenario is when you have a list of names and need to fetch associated data for each name. In this guide, we'll explore how to properly set up your API calls in a way that avoids glitches and organizes data effectively using useState and useEffect.

The Problem at Hand

Imagine you have a list of names, and your goal is to make multiple API calls to fetch data for each name. In a typical setup, you might encounter issues where making these requests leads to a glitchy experience on your site.

The issue usually arises from how the loop for the API calls is structured within the useEffect hook. As the state changes, the useEffect re-runs, potentially causing endless loops and performance bottlenecks. How do we achieve the goal without these pitfalls?

A Robust Solution

To implement a more efficient solution, consider the following steps:

1. Separate Fetch Logic

Instead of fetching data directly within useEffect, create a separate function for API calls. For this, we can utilize the useCallback hook, or simply a standalone function. This approach makes your code cleaner and enhances maintainability.

Example:

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2. Use useEffect for Initial Call

You should structure your useEffect to only run once on component mount (similar to componentDidMount), by providing an empty dependency array. Inside this useEffect, invoke the fetchData function for each name.

Example:

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3. Correctly Updating State

When using setPersons, it's critical to utilize the previous state to ensure that new entries are appended correctly. This avoids overwriting data and ensures that your state management is predictable.

4. Final Component Structure

Your complete component might look like this:

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5. Rendering the Data

Make sure to render the data cleanly on your page. In the final structure, we've mapped over the persons array to display individual components for each person's data.

Conclusion

Handling multiple API calls in React using useState doesn't have to be cumbersome. By following structured patterns such as separating fetch calls, using useEffect correctly, and managing state updates with care, you can create a seamless experience in your application.

Next time you find yourself needing to make multiple API calls, remember these tips to keep your React application glitch-free and organized!