.env.local |best|

By placing .env.local of the precedence chain, the pattern ensures that any variable you set there will override the same variable from any other file. This is intentional: it allows you to test a different API endpoint or database without modifying the committed configuration.

The .env.local file is an indispensable tool for local web development. It allows you to customize your local runtime environment safely, keeps sensitive credentials out of source control, and ensures seamless collaboration across development teams when paired with a .env.example file. .env.local

Next.js has the most sophisticated environment variable handling. It supports multiple files out-of-the-box. By placing

Then, initialize it at the very top of your entry file (e.g., index.js or server.js ): javascript It allows you to customize your local runtime

Failure to add this entry is a . Any developer committing .env.local to a repository exposes all local API keys, database credentials, and service tokens.