.env.local.production [upd]

In many modern frameworks (like Next.js, Vite, and Gatsby), there is a specific hierarchy of file loading. While .env.production is loaded for production builds, acts as an override specifically for local instances of a production build.

A .env.local.production file is used to store for a production build that are intended to be kept local to a specific machine . In frameworks like Next.js or Create React App , this file overrides general production settings without being committed to version control, keeping sensitive keys secure on the server . Sample Content for .env.local.production .env.local.production

# .gitignore .env.production.local .env.local *.local # .env.production (committed) API_URL=https://api.myapp.com/v1 LOG_LEVEL=info # .env.production.local (gitignored) API_URL=https://staging-api.myapp.com/v1 # local override LOG_LEVEL=debug DEBUG=true In many modern frameworks (like Next

Remember the golden rule of environment variables: Whether the file is called .env , .local , or .env.local.production , if it contains sensitive data, it belongs outside your repository. In frameworks like Next

Use conventional filenames recognized by your framework (.env.production for production config and .env.local for local overrides). Reserve .env.local.production only if you have a documented, explicit loader that requires it and ensure strict secret-handling practices (ignore in VCS, use secret managers, audit access).

# .env.local.production (not in Git) DATABASE_URL="postgresql://localhost:5432/prod_mirror" STRIPE_SECRET_KEY="sk_test_localDebugKey" NEXT_PUBLIC_ANALYTICS_ID="debug-123"

When running npm run build && npm start (production mode), the app will use API_URL from .env.production.local .