.env.local.production Jun 2026

NODE_ENV=production next start

Use the wildcard *.local to catch all variants.

In Next.js, variables that are not prefixed with NEXT_PUBLIC_ are only available during the build step. If you need a variable in the browser, use NEXT_PUBLIC_API_URL . 4. .env.local.production

Vite will look for .env.production.local (note the slight syntax variation common in Vite ecosystems, though many setups parse .env.local.production depending on the custom bundler configurations). In Vite, variables must be prefixed with VITE_ to be exposed to your client-side code. 3. Create React App (CRA)

Vite uses dotenv to load environment variables and handles modes explicitly. If you run vite build , Vite automatically sets the mode to production . NODE_ENV=production next start Use the wildcard *

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:

As a developer, you're likely no stranger to the challenges of managing environment variables in your applications. Whether you're working on a small web app or a large-scale enterprise software, environment variables play a crucial role in configuring your application to run smoothly in different environments. In this article, we'll explore the concept of .env.local.production and how it can help you manage environment variables in production. To understand why it fails

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To understand why it fails, break down how the framework reads the filename: : The base prefix alerting the parser to read the file. .production : The target execution stage.

If you deploy to Vercel, Netlify, Cloudflare Pages, or Render, use .env.local.production to upload secrets to your live site. Instead, input your environment variables directly into the platform's web dashboard settings. These platforms securely inject variables at build time, eliminating the need to manage physical .env files on a server. Summary Cheat Sheet Intended Environment Committed to Git? .env All environments Yes Baseline defaults for the project. .env.development Development mode only Yes Shared dev configurations (e.g., dev API endpoints). .env.production Production mode only Yes Shared non-secret production configs. .env.local All environments 🚫 No Your personal overrides for everyday coding. .env.local.production Production mode only 🚫 No

console.log('Loading env from:', process.env.NODE_ENV); console.log('API Key:', process.env.API_KEY);