How to Fetch Data from Multiple APIs in React

Learn how to effectively `call multiple APIs` in a React application using `axios`, combining responses to render dynamic content.
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How to Fetch Data from Multiple APIs in React: A Simple Guide

When developing applications in React, it’s common to need data from multiple sources. For instance, you might want to fetch data from a primary API and use that data to make another API call. This can sometimes be challenging, especially if you are unfamiliar with handling asynchronous operations. In this guide, we will tackle a specific problem: how to fetch data from a second API based on responses from the first API using React and axios.

The Problem

In a recent project, a developer faced the challenge of calling a second API using data obtained from the first one. They attempted to use a single state with useState and chain promises using axios, but it wasn’t working as expected. Here's a quick overview of the two APIs involved:

API 1 (Posts)

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API 2 (External Images)

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

The challenge was to fetch data from both APIs and render them based on the relationships defined by the external_id in API 1.

The Solution

To fetch and combine data from these two APIs effectively, let’s consider a structured approach to rework the initial code provided in the question. Here's a step-by-step breakdown:

Step 1: Set Up State Variables

We need to set up two state variables: one for storing the posts fetched from the first API and another for the external data from the second API.

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

Step 2: Use useEffect to Fetch Data

We will place the data fetching logic within the useEffect hook to ensure it runs when the component mounts.

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

Step 3: Render the Combined Data

Once we have set the state variables with the fetched data, we can pass them as props to a child component for rendering:

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

Final Implementation

Here's the complete revised implementation of the App component:

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

Conclusion

The above approach effectively fetches data from both APIs and combines them for rendering. By using an array and the forEach method, we can easily handle multiple asynchronous requests in a manageable way. Remember, this method helps prevent multiple rerenders while ensuring all data is fetched correctly.

Now you're equipped to integrate multiple API calls in your React applications, enhancing your ability to work with dynamic data sources!