Solving the axios GET Request Error: Rendering Client Data in React

Learn how to fix the common "is not defined" error when rendering data fetched with `axios` in your React component!
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This video is based on the question stackoverflow.com/q/72410024/ asked by the user 'matheusfribeiro' ( stackoverflow.com/u/19216395/ ) and on the answer stackoverflow.com/a/72410093/ provided by the user 'Yasser hennawi' ( stackoverflow.com/u/7484842/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Solving the axios GET Request Error: Rendering Client Data in React

React components often need to fetch data from APIs, and using axios is one of the popular methods. However, many developers encounter issues when trying to render that fetched data, often running into the frustrating "is not defined" error. In this guide, we will address this common problem and guide you on how to properly handle the fetched data inside your React component.

The Problem

Imagine you have a React component that makes an axios GET request to retrieve a list of clients. You successfully see the data in your console, but when you attempt to render it in your component, you encounter the error:

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This error occurs because the variable where the fetched clients are stored is defined within a local scope inside the axios callback. As a result, it is not accessible in the component's return statement where you attempt to render it.

The Solution

Step 1: Use React State

To solve this issue, you will need to store the fetched client data in a state variable using React's useState hook. This allows you to manage the data in a way that it persists across renders.

Here's how to implement it:

Import useState from React: Add this at the beginning of your component.

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Initialize State: Create a state variable to hold the clients list.

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Step 2: Update State After Fetching Data

After fetching the data from your API, make sure to set this state variable with the retrieved data. Modify your axios GET request like this:

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Summary of Changes:

Use useState: Added state to store the client data.

Update on Fetch: Set the state with the fetched clients after the API call.

Render Safely: Render the client data from the state variable in your return statement.

Conclusion

By following these steps, you successfully eliminated the "is not defined" error and made your React component more robust and capable of handling API data effectively. Managing state with useState ensures that your component re-renders with the appropriate data as soon as it is fetched. Happy coding!