.env.development Verified May 2026

Guide: Using .env.development

1. What is it?

.env.development is an environment file that stores variables exclusively for your development environment (e.g., localhost). It is commonly used with libraries like dotenv (Node.js) or frameworks like React (CRA), Vue, and Next.js.

// Advanced dotenv setup
require('dotenv').config( path: '.env' );
if (process.env.NODE_ENV === 'development') 
  require('dotenv').config( path: '.env.development', override: true );
  if (fs.existsSync('.env.local')) 
    require('dotenv').config( path: '.env.local', override: true );

Example .env.test:


Use .env.development to make your npm run dev experience consistent, safe, and configurable. .env.development


    

  1. Comments: Lines starting with # are ignored, allowing you to leave notes for yourself or your team.
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  2. Key-Value Pairs: The standard KEY=VALUE syntax.
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  3. Conventions: Keys are typically written in SCREAMING_SNAKE_CASE to distinguish them from regular variables in code.
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