provides overrides specifically for the test environment.
console.log('Loading env from:', process.env.NODE_ENV); console.log('API Key:', process.env.API_KEY);
To understand .env.local.production , you must first understand how modern build tools and frameworks prioritize configuration files. Most tooling follows a strict cascading order when loading environment variables.
If you see .env.local.production on a cloud server (AWS EC2, Heroku, Vercel), you have made a deployment error. These files belong on local workstations only. .env.local.production
Modern JavaScript frameworks load environment variables using a strict hierarchy. If the same variable is defined in multiple files, the framework will choose the value from the file with the highest priority.
When your application runs in a production environment (typically defined by NODE_ENV=production ), the framework looks for multiple .env files and merges them. If the same variable exists in multiple files, the file with the highest priority overrides the others.
I can provide the exact code or steps for your specific setup. provides overrides specifically for the test environment
NEXT_PUBLIC_API_URL=https://api.myapp.com # This is the default production URL
For professional scaling, treat this file as a fallback. Whenever possible, use the "Environment Variables" settings provided by your cloud host, as these are generally more secure and easier to rotate.
Because .env.local.production is ignored by Git, other developers or your deployment environments won't know what variables it requires. Create a .env.example file to serve as a template. If you see
If developers already have .env.production and .env.local , why does .env.local.production exist?
Like all .local files, it is designed to be ignored by version control to keep sensitive or machine-specific data out of the repository.