To understand .env.local.production , it helps to break the filename down into its three component parts:
# .env.example DATABASE_URL="" STRIPE_SECRET_KEY="" NEXT_PUBLIC_API_URL="" Use code with caution. 3. Restrict Local File Permissions
is another frequent source of bugs. In React and Next.js, variables prefixed with REACT_APP_ or NEXT_PUBLIC_ are replaced at build time—they become literal strings in your JavaScript bundle. If you need runtime values, use server-side variables or design your architecture accordingly. .env.local.production
It only loads when your application is running in "production mode" (e.g., after running npm run build and npm start ). It will be ignored during development ( npm run dev ).
Before pushing code to live servers, you should test the optimized production build on your local machine (e.g., running next build && next start ). If your production environment requires specific API keys, payment gateways (like Stripe Live mode), or database strings, you can place them in .env.local.production . This ensures your local development environment ( .env.development ) remains safely hooked into sandbox/test accounts. 2. Debugging Production-Specific Bugs To understand
Overriding a shared teammate's production variable temporarily on your own machine without altering the codebase for the rest of the team. What to Put Inside the File
If you want to dive deeper into configuring your pipeline, let me know: In React and Next
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Use .env.production for non-sensitive production defaults (e.g., public asset URLs).
Because .env.local.production sits higher in the hierarchy than .env.production and .env , it will successfully override any default values you have committed to your repository when you run a production build locally. However, it will still bow to variables explicitly set in your cloud provider's dashboard, ensuring your actual live production server remains unaffected. Common Use Cases for .env.local.production
holds production-specific configuration values. Like its development counterpart, this file should contain only non-sensitive defaults.