.env.development.local | //free\\

If you aren't using a frontend framework, you can replicate this behavior with the dotenv-flow package.

const dotenv = require('dotenv'); const path = require('path');

: While .env.development is often tracked in Git to give the team a starting point, .env.development.local is where you put the real secrets you want to keep off GitHub. .env.development.local

She navigated to the project root and typed ls -a . There it was, hidden in plain sight:

DB_HOST=localhost DB_PORT=5432 DB_USERNAME=myuser DB_PASSWORD=mypassword API_KEY= myapikey If you aren't using a frontend framework, you

Maya stared at the blinking cursor in her terminal. The deadline was seventeen hours away, and the staging environment had just collapsed like a house of cards in a hurricane.

.env.development (committed): REACT_APP_API_URL=https://staging-api.example.com FEATURE_X=false There it was, hidden in plain sight: DB_HOST=localhost

This file acts as the ultimate override for development-specific variables. When you run your application in development mode (typically via npm run dev or yarn start ), the system looks for variables across several files. In frameworks like Next.js, .env.development.local holds the . The typical hierarchy (from highest to lowest priority) is: