How to Create and Use the env Variable in React js || .env || React App Environment Configuration
In a React.js project, a .env file is used to store environment variables. These variables are often configuration values that can change depending on the environment (development, production, etc.). Using a .env file helps keep sensitive information (like API keys) and configuration values separate from your source code, making your project more secure and easier to manage.
If console.log('API URL:', apiUrl); outputs undefined, it could be due to several reasons. Here are a few common issues and how to address them:
Incorrect Variable Naming:
Ensure the environment variable in the .env file is correctly named and prefixed with REACT_APP_. For example:
REACT_APP_API_URL=https://api.example.com
Placing .env in the Correct Directory:
Make sure the .env file is placed in the root directory of your React project (at the same level as package.json).
Restart the Development Server:
After making changes to the .env file, you need to restart the development server. Stop the server and run npm start (or yarn start) again.
Correctly Accessing Environment Variables:
Ensure you are accessing the environment variables correctly in your React
Environment Variable Availability:
Check if the environment variables are properly defined and not misspelled in the .env file.
If you have verified all the above steps and still face issues, try to:
Check for Typos: Ensure there are no typos in the .env file or in the code where you access the variables.
Create a New React App: Sometimes, configurations might be corrupted. Creating a new React app and copying your files there can help isolate the issue.
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