Node.js projects are managed by the crucial `package.json` file, which holds metadata such as dependencies, scripts, and configuration settings. It's generated when initializing a new project with `npm init`, but its significance extends beyond initialization, and mastering its features can unlock full potential in Node.js projects.
Environment variables are values set outside of code, allowing decoupling of configuration settings from the codebase, making it easier to manage different environments. They're essential for building scalable and maintainable applications, enabling easy switching between environments without modifying code, and keeping sensitive data out of the codebase.
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