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The Create React App documentation states that you must prefix all environment variables within your .env files with REACT_APP_ for them to be available from within your codeprocess.env.REACT_APP_<variable name>
If you don't want to useREACT_APP_ prefix, you can use env-create-react-app
Try using backticks(``)
For Example :`${process.env.API_URL}/code`
Make sure you have the .env file in your root folder(same place where you have your package.json) and NOT in your src folder.
You mention you changed your environment variables to start withREACT_APP - do you have a trailing underscore? They should start withREACT_APP_.
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