.env.development.local Free May 2026
Master .env.development.local : The Modern Developer's Guide Managing configuration settings is a core part of building modern web applications. Whether you're using React, Next.js, or Node.js, the .env.development.local file is an essential tool for keeping your local development environment secure and flexible. What is .env.development.local ?
.env.development.local (gitignored): REACT_APP_API_URL=http://localhost:5000 LOCAL_DB_URL=postgres://dev:password@localhost:5432/devdb FEATURE_X=true .env.development.local
Variable Precedence
: In frameworks like Next.js or Create React App , variables in .env.development.local will override those in .env.development and .env . Master
.env.development.local
Managing configuration across different environments is a cornerstone of modern web development. While standard .env files are common, the specifically named plays a critical role in local workflows, particularly within ecosystems like Next.js and Create React App . What is .env.development.local ? Scenario A: Personal API Keys
- .env — default values for all environments
- .env.local — local overrides for all environments (not committed)
- .env.development — defaults for development environment
- .env.development.local — local overrides for development (highest priority in development)
- .env.production — defaults for production environment Note: exact precedence can vary by tool; consult your framework’s docs.
Scenario A: Personal API Keys
.env.development.local is a dotenv-style environment file commonly used in JavaScript/Node and frontend projects (Create React App, Vite, Next.js, etc.) to store development-only environment variables that should override other development settings on a single machine. It fits into a conventional dotenv hierarchy where different files target different environments and scopes (e.g., .env, .env.development, .env.production, .env.local).
Sometimes you need to simulate a production build locally ( npm run build && npm run start:prod ). In that scenario, you might load .env.production . But what if you need to test a Production build with a specific local override (like a different log level or a mock payment gateway)?