Environment Variables: A Complete Guide for Developers
Learn what environment variables are, how to use them, best practices for managing secrets.
By RiseTop Team · May 2026 · 8 min read
Environment variables are dynamic values that affect how running processes behave. They are essential for configuring applications without hardcoding values.
Common Use Cases
API keys and secrets - Database passwords, API tokens
Configuration - Port numbers, debug mode, log level
Paths - HOME, PATH, NODE_PATH
Feature flags - Enable/disable features per environment
Best Practices
Never commit .env files to version control
Use .env.example files to document required variables
Validate required variables at startup
Use a secrets manager for production
Frequently Asked Questions
Should I commit .env files to git? +
Never commit .env files with real values. Commit .env.example with placeholders. Add .env to your .gitignore.
How do I manage secrets in production? +
Use a secrets manager like HashiCorp Vault, AWS Secrets Manager, or GitHub Secrets.
What is the difference between env vars and config files? +
Env vars are set by the system/container and are simpler for deployment. Config files offer more structure. Use env vars for secrets, config files for everything else.