: For development mode ( next dev ), the priority is: process.env (runtime environment) → .env.development.local → .env.local → .env.development → .env .
VUE_APP_API_URL=https://api.myapp.com VUE_APP_DEBUG=false
Once you have mastered the basics, you can explore advanced techniques that leverage the full power of .env.development .
: Vite requires the VITE_ prefix; any other prefix won't be exposed to client-side code.
While this article focuses on .env.development , a complete setup includes .env.test . .env.development
Here’s a typical snapshot:
The primary goal of using a .env.development file is to . This ensures that your application behaves correctly in your local environment while remaining flexible enough to switch to different settings when deployed to staging or production.
const z = require('zod');
: Avoid writing KEY = value . Write KEY=value instead. : For development mode ( next dev ),
next.js environment variables are undefined (Next.js 10.0.5)
: It provides a safe space for individual developers to customize their local setup (e.g., pointing to a local database at localhost:5432 instead of a remote staging server). Best Practices for Your .env.development File
A variable has a different value than what's defined in .env.development .
.env.development is a file used to store environment variables specific to the development environment. It's a variant of the popular .env file, which has become a standard in the industry for managing environment variables. The .env.development file serves as a centralized location for storing sensitive information, such as API keys, database credentials, and other configuration settings that differ between environments. While this article focuses on
When a build tool or framework initializes, a specific loading order determines which values take precedence. Generally, local override files ( .env.development.local ) override environment-specific files ( .env.development ), which in turn override the generic fallback file ( .env ). File Syntax Rules
Elias leaned back, satisfied. But in his exhaustion, he decided to do one final "clean up." He opened a new file to share with his collaborator, Sarah. He wanted to show her the
Environment variables are loaded into memory when the application process starts. If you modify your .env.development file, the changes will not take effect dynamically. "My frontend code says the variable is undefined ."