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Step 1 =
                Create .env file on root directory

Step 2 = 
              Make variables like this.

              REACT_APP_APP_URL=http://localhost:3000

Note that the environment variables in React must be prefixed with REACT_APP_, otherwise React will ignore the variable during bundling.

Step 3 =

Use variable like this in any file

"process.env.REACT_APP_APP_URL"