How to Validate Environment Variables in TypeScript (and Why You Should)

A tutorial shows how TypeScript developers can validate environment variables with a schema-based approach before deployment.

It uses env-haven to automatically check .env values, generate TypeScript types, and enforce fields like DATABASE_URL, NODE_ENV, API_KEY, and PORT.

The workflow can be added to CI, including GitHub Actions, so config errors are caught early instead of causing runtime failures.

This helps prevent silent environment-variable mistakes, credential issues, and production outages.