Uncaught ReferenceError: process is not defined ReactJS

• Add latest react-scripts using npm

  You can run npm install react-scripts@latest command to get the solution of error Uncaught ReferenceError: process is not defined ReactJS.

  npm install react-scripts@latest
  

• Upgrade react-scripts using package.json file

  Upgrade react-scripts using package.json file and run npm install command.

  "dependencies": {    
      "react-scripts": "5.0.0",
  }
  

• Adding window.process to App.js

  Another solution is to add window.process to your src\App.js file.

  useEffect(() => {
      window.process = {
        ...window.process,
      };
    }, []);
  

• What is react-scripts

  react-scripts are simply scripts to run the build tools required to transform React JSX syntax into plain JavaScript programmatically. In the past, creating a React app was a painful process. You had to go through a lot of configuration, especially with webpack and Babel. But here react-scripts make your task easy.

  "scripts: {
      "start": "react-scripts start",
      "build": "react-scripts build",
      "test": "react-scripts test",
      "eject": "react-scripts eject"
  },
  

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