Fundamentals · Easy · Free
What are environment variables? Never commit secrets — how?
FresherFundamentalsWeb & Full-Stack
Environment variables
Config differs per environment (DB URL, API keys). Inject via env vars or secret managers—never commit .env with secrets to git.
text
# .env.example (committed)
DATABASE_URL=postgres://localhost:5432/app
# real .env in .gitignoreUse
.env.example documenting keys without values.