.env.local.production

This brings us to the keyword: (often written without the second dot as .env.local.production depending on parser logic). Part 2: What Exactly is .env.local.production ? The file name .env.local.production (or .env.production.local ) is an environment-specific, machine-local override file .

# .github/workflows/deploy.yml - name: Create .env.production.local run: | echo "BUILD_CACHE_TOKEN=$ secrets.CI_TOKEN " > .env.production.local npm run build You are testing a production build but have a limited API key for Stripe or OpenAI that fails on high volume. Override it with a local test key without touching the real .env.production . Part 5: Security Nightmare – Do NOT Commit This File This section cannot be stressed enough. .env.local.production

At first glance, this file name looks like a typo or a conspiracy. However, for developers using frameworks like Next.js, Gatsby, or Vite, this specific naming convention solves a critical pain point: This brings us to the keyword: (often written

Do not use both. Use .env.local for development mode. Use .env.production.local exclusively for production mode debugging. Part 7: Debugging – Is My File Being Loaded? It is notoriously difficult to know which env file is active. Here is how to check. Method 1: Dump the Config (Next.js) Create a file pages/api/debug.js : At first glance, this file name looks like

The framework loads .env.local first (lower priority) and then .env.production.local (higher priority). Variables from the production-local file will win.