Create React App Environment Variables. By default you will have node_env defined for you.env Since create react app produces a static html/css/js bundle, it can’t possibly read them at runtime.
Therefore no build per environment would be required. The environment variables we usually use in react are for build time, instead of run time. Variables declared in build configuration.
Now, we can define environment variables inside that file using react_app_.variable_name=value.
In this chapter we will look at some simple ways to configure multiple environments in our react app. Create react app has support for custom environment variables baked into the build system. // grab node_env and react_app_* environment variables and prepare them to be // injected into the application via defineplugin in webpack configuration. Create react app has support for custom environment variables baked into the build system.