A high-quality template includes:

| Problem | Solution with .env.sample | |---------|-----------------------------| | New developers don't know which vars to set | They copy .env.sample → .env and fill in values | | Secrets would leak if .env is committed | .env is ignored; only the sample (with dummy/fake values) is shared | | Deployment systems need a var checklist | The sample acts as a contract | | CI/CD pipelines need to mock env vars | They can use .env.sample with test values |

Let's start with the basics. A standard .env file (dot-env) is a plain text file used to store environment variables for a specific environment (development, staging, production). It usually looks like this: