Next.js comes with built-in support for environment variables, which allows you to do the following:
* Expose environment variables to the browser by prefixing with
NEXT_PUBLIC_
Default Environment Variables : In general only one .env.local file is needed. However, sometimes you might want to add some defaults for the development (next dev) or production (next start) environment.
Next.js allows you to set defaults in .env (all environments), .env.development (development environment), and .env.production (production environment).
.env.local always overrides the defaults set.
