How to: ![✔] 5.15. Set `NODE_ENV=production`
**TL;DR:** Set the environment variable `NODE_ENV` to ‘production’ or ‘development’ to flag whether production optimizations should get activated – some npm packages determine the current environment and optimize their code for production

**Otherwise:** Omitting this simple property might greatly degrade performance when dealing with some specific libraries like Express server-side rendering

🔗 [**Read More: Set NODE_ENV=production**](./sections/production/setnodeenv.md)