.env.development.local |top| Jun 2026

The existence of .env.development.local might seem like an unnecessary complication at first glance. Why not simply modify .env.development directly? The answer lies in three core principles of collaborative software development: , security , and workflow flexibility .

.env.local .env.*.local

# Emergency local overrides - do not share API_GATEWAY=http://localhost:8999 MOCK_PAYMENTS=true FORCE_LEGACY_FALLBACK=1 DEVELOPMENT_MODE_OVERRIDE=ok .env.development.local

When your app runs in development, it loads environment files in a specific order. Files listed earlier (left to right) have higher priority and will override matching keys in files to their right: .env.development.local (Highest priority) .env.local .env.development (Lowest priority) Example Content The file follows a standard format. Here is how a typical .env.development.local might look: # Example overrides for local development only PORT=4000 DATABASE_URL= "postgres://localhost:5432/my_dev_db" API_SECRET= "your-private-local-key" DEBUG_MODE=true Use code with caution. Copied to clipboard Comparison Table Shared (Commited to Git)? Default values for all environments. Yes (often as .env.example .env.development Values specific to development. Yes, if they aren't secret. .env.development.local Local secrets/overrides for development. No (Add to .gitignore programmatically load this file in a specific framework like Node.js or React?

# .env.production.local (Ignored) NODE_OPTIONS="--inspect" LOG_LEVEL="debug" The existence of

And sometimes, .env.development.local is the truest environment of all.

# .env.development.local DATABASE_URL=postgresql://localhost:5432/mydb STRIPE_SECRET_KEY=sk_test_1234567890 API_PORT=5000 Use code with caution. Step 4: Accessing the Variables in Code Copied to clipboard Comparison Table Shared (Commited to

This pattern will ignore .env.development.local , .env.production.local , and any other similarly named files.

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

Remember: commit the shared .env.development , ignore the local .env.development.local , and always respect the load order. Do this, and you will never again have the dreaded "but it works on my machine" argument over environment variables.

The Complete Guide to .env.development.local In modern software development, managing configuration settings—like API keys, database URLs, and environment-specific toggles—is a critical challenge. Hardcoding these values is unsafe, and storing them in version control (like Git) is a security risk.