This article will teach you how to read environment variables from .env files into multiple Angular environments. What is the .env file? The .env file is a plain-text file used to store sensitive data and environment-specific configuration for a software application. Sample file: GREETING = HELLO WORLD SECRET = 12345 Enter fullscreen mode Exit fullscreen mode By default, Angular uses the Environment files built into the framework (under src/environments ), which are good for runtime but are publicly visible (and thus expose environment secrets). To get around this, we'll create a .env file for each environment (dev, staging, production) and load those variables into the Angular env file. How are we going to implement this?…