envexp

Export environment variables to a json or javascript file

Use case

One use case for this small cli tool is to enable runtime variables when deploying a create-react-app web-app with Docker. The idea consists in using a env.js script included from index.html. This script sets the window._env property with environment variables. However, this script must be created during start up of your docker container.

With envexp tool you can create the env.js script easily before start serving your web-app.

Fore more details read this issue.

Usage Examples:

Basic export

./envexp -t json > env.json
./envexp -t web > env.js

Export environment variables starting with prefix

./envexp -t json -prefix REACT_APP_ > env.json
./envexp -t web -prefix REACT_APP_ > env.js

Basic export with pretty output

./envexp -p -t json > env.json
./envexp -p -t web > env.js