API_ENDPOINT_DEV=http://localhost:3000/api API_KEY_DEV=myapikey
Your test runner (Jest, Mocha, PyTest) should automatically load .env.test and load .env.development .
Frameworks like React, Next.js, and Node.js can be configured to automatically load .env.development when running a "dev" script, and switch to .env.production during the build process. How to Implement .env.development 1. Structure of the File .env.development
Multiple .env files, encrypting secrets, and committing .env to code
import environ env = environ.Env() environ.Env.read_env(overwrite=True) Structure of the File Multiple
Many developers forget that frontend frameworks (React, Vue) bake environment variables at build time. If you run npm run build with NODE_ENV=development , your production bundle will contain dev API URLs. Always ensure your build pipeline uses .env.production .
Which (Next.js, Vite, Node/Express, etc.) you are building with. Which (Next
: Write keys in uppercase, separated from values by an equals sign ( = ), with no spaces around the operator.