Since .env.development.local is not committed, create a .env.example file containing the keys (but not the values) so other developers know what variables are required [3jop].
.env.local .env.*.local
const envPath = path.join(process.cwd(), '.env.development.local'); const content = fs.readFileSync(envPath, 'utf-8');
: If using Vite or Create React App, ensure variables meant for the browser are prefixed with REACT_APP_ , respectively. Fallback Sync : Check if .env.example
Environment-specific configuration is a common challenge in software development. Different environments require distinct settings, such as database connections, API keys, and server configurations. Hardcoding these settings directly into the application code can lead to errors, security vulnerabilities, and difficulties in maintaining and scaling the application. To address this issue, developers often use environment files, which store configuration settings specific to each environment. .env.development.local
For generic Node.js applications, the dotenv-flow package provides the most robust implementation of this file hierarchy. It is an extension of the popular dotenv library that adds support for environment-specific files.
Environment variables are typically loaded into process.env when the application or development server starts. If you modify a .env* file while the server is running, the changes take effect until you manually restart the server.
Hardcoding environment variables directly in an application's code is a common anti-pattern. This approach has several drawbacks:
files exist, frameworks load them in a specific order. A typical loading order (from highest to lowest priority) is: .env.development.local .env.local .env.development 3. Usage Example For generic Node
If you commit this file, you defeat the purpose of the .local suffix. You risk exposing secrets (API keys, database passwords) on GitHub/GitLab, and you force your local configuration onto your teammates.
export default async function HomePage() const users = await getUsers(); // Safe: runs only on the server // Pass only the necessary data to client components return <UserList initialUsers=users />;
: It is only loaded when your app is running in "development" mode (usually NODE_ENV=development Priority Order
Add it to your .gitignore immediately.
Keys that shouldn't be shared with teammates (e.g., your personal STRIPE_SECRET_KEY Local Overrides:
: Indicates that this specific file is unique to the developer's machine and must not be tracked by version control systems like Git . Environment Variable Load Order
// Your database connection logic here... export async function getUsers() // Query your database using the secure URL const users = await fetch(DATABASE_URL, ... ).then(res => res.json()); return users;
git rm --cached .env.development.local