Environmental variables accessing in expo project

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I have 2 folders in my project. One folder is of API and other is of FRONTEND and both of these contain.env files.

I am confused after reading the expo doc, which .env variables am I supposed to include in extra part of app.json file?

After I am creating a build only the FRONTEND part is working but server isn’t working like it is in development mode.

Did you figure this out? I am also extremely confused the documentation.

you don’t have to use env vars at all. i would recommend not using them unless you have a very good reason to do so. if you are having trouble getting this set up, i would strongly advise not using them. just create a file like Constants.js and put any values you want to store in there