The .env.local.production file is a powerful tool for modern developers. It provides a sandboxed environment to test optimized, production-grade builds on a local machine without leaking secrets to version control or interfering with standard day-to-day development configurations. By mastering the environment cascade, you ensure smoother deployments, fewer configuration bugs, and an uncompromised security posture.
Add your targeted staging or local production keys. Remember to use the NEXT_PUBLIC_ prefix only for variables that must be exposed to the browser. .env.local.production
You might wonder why you wouldn't just use .env.production . The answer lies in the distinction between and sensitive secrets . 1. Security and Secrets Add your targeted staging or local production keys
In a Next.js application, if you run next build , the framework will look for .env.production . If it finds .env.local.production , it will load those values and let them overwrite any conflicting keys in .env.production . NEXT_PUBLIC_API_URL=https://myapp.com LOG_LEVEL=info Use code with caution. Example .env.local.production (On the Server): The answer lies in the distinction between and
# .env.production NEXT_PUBLIC_CDN_URL=https://d123.cloudfront.net
Vite uses dotenv under the hood but has a slightly different loading order.