Are you facing the dreaded “Uncaught ReferenceError: React is not defined” error in your JavaScript code? Don’t worry, you’re not alone! This error is a common stumbling block for developers working with React. In this blog post, we will explore the possible causes of this error and provide you with multiple solutions to resolve it.
Cause of the Error
The “Uncaught ReferenceError: React is not defined” error occurs when the React library is not properly imported or included in your JavaScript file or HTML document. This error typically happens when you forget to include the necessary React script tags or import statements.
Solution 1: Using Script Tags
If you are using React in a traditional HTML file, make sure to include the React script tags in the correct order. The React library should be included before any other scripts that depend on it. Here’s an example:
Make sure to replace the URLs in the script tags with the appropriate version of React that you are using.
Solution 2: Using Module Bundlers
If you are using a module bundler like Webpack or Parcel, you can import React directly into your JavaScript file. Here’s an example:
import React from 'react';
import ReactDOM from 'react-dom';Make sure that you have installed React and its dependencies using a package manager like npm or Yarn.
Solution 3: Checking the React Version
If you have multiple versions of React installed in your project, it’s possible that the version you are trying to use is not defined. In this case, you can check the version of React you have installed and make sure it matches the version you are importing or including in your project.
Conclusion
The “Uncaught ReferenceError: React is not defined” error can be frustrating, but with the solutions provided in this blog post, you should be able to resolve it and get back to coding with React. Remember to double-check your script tags or import statements, ensure the correct order of dependencies, and verify the React version you are using. Happy coding!
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