.env.local.production [top] Instant

He remembered now. Three weeks ago, a junior developer had complained that the production logs were too noisy. "Can't we just turn them off for a bit?" the kid had asked in a Slack thread. Leo had laughed and written a quick reply: "Never. But if you want to test locally, you can create a .env.local.production file to simulate production behavior without spamming real logs."

| File Name | Purpose | Commit to Git? | | :------------------------ | :---------------------------------------------------------------------------------------------------------------- | :------------- | | .env | Base defaults that are safe to share (e.g., NEXT_PUBLIC_APP_NAME=MyApp ). Serves as a fallback. | Yes (Use with caution—no secrets!) | | .env.local | Local machine overrides for all environments (except test). Ideal for secrets that should never leave your machine, like a personal API key for local development. | No | | .env.development | Development-specific defaults (e.g., a local API URL). Often safe to commit if it contains no secrets. | Maybe | | .env.development.local | Local overrides for the development environment. The highest priority for npm start or npm run dev . | No | | .env.production | Production-specific non-secret defaults (e.g., the URL of your production API). Can be committed if no secrets. | Maybe | | .env.production.local | Local overrides for the production environment. Highest priority for npm run build . commit. | No | | .env.test | Test-specific settings. | Maybe | | .env.test.local | Local overrides for the test environment. | No | .env.local.production

Modern frameworks require specific prefixes to expose variables to the browser client (e.g., NEXT_PUBLIC_ in Next.js, VITE_ in Vite). He remembered now

If your framework does not natively support this pattern, or you want full control, here is a custom implementation using Node.js and dotenv . Leo had laughed and written a quick reply: "Never

Mastering .env.local.production : The Ultimate Guide to Environment Variable Overrides