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This guide explains how to retrieve data using `axios`, handle promises, and display fetched data clearly within your React component. Learn effective techniques for managing asynchronous data in React!
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This video is based on the question https://stackoverflow.com/q/76624247/ asked by the user 'dont-know' ( https://stackoverflow.com/u/22181645/ ) and on the answer https://stackoverflow.com/a/76624322/ provided by the user 'SearCloud' ( https://stackoverflow.com/u/22181632/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Mastering React: How to Fetch and Display Data with axios

If you're new to React and working with asynchronous data, you may have encountered issues when trying to retrieve and display data using axios. This is a common challenge faced by many developers, especially those transitioning from using jQuery or XMLHttpRequests. In this post, we'll break down how to effectively fetch data and display it within your React components. We'll cover handling promises and utilizing React's state management to ensure your data is presented correctly. Let's dive in!

Understanding the Problem

First, let's clarify the issue at hand. As you work with asynchronous functions in React, you may find that you can access the data within your async function but struggle to pass it out for use in your React component. Specifically:

Fetching Data: You've confirmed that your data exists and can be fetched asynchronously, but once you try to reference it outside your async function, it returns as a promise.

Using Data in the Component: You want to display this data in your component and iterate through it, similar to how you would with jQuery.

To address these challenges, we will utilize the useEffect hook and React's state management features effectively.

The Solution

Setting Up State with useState

Before we can fetch and display our data, we need to set up state using the useState hook. This hook will allow us to maintain the fetched data throughout the component's lifecycle. Here's how to initiate it:

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Using useEffect for Data Fetching

Next, we need to fetch the data when the component loads. For this purpose, we'll use the useEffect hook. This hook runs a function when the component is mounted (or when specified dependencies change). Here's the setup we need:

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Rendering the Fetched Data

Now that we have our data saved in state, we can render it within our component. We’ll iterate through the bookData using the map function, allowing us to display each book's title in the UI. Here's how this can be done:

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Final Code Example

Putting all these pieces together, here is the complete implementation of our Books component which fetches and displays book titles:

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Conclusion

Fetching data in React can be simple and straightforward once you understand how to manage useEffect and component state. Using axios or the standard fetch method, you can easily retrieve and display dynamic data within your components. This fundamental skill is vital for building interactive applications. Now you're equipped to pass data outside of your async functions effortlessly and make it integral to your React components. Happy coding!