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Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>
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content/roadmaps/107-nodejs/content/101-nodejs-modules/100-commonjs-vs-esm.md
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# CommonJS vs ESM
The CommonJS module system, on the other hand, is built into Node.js. Before the introduction of the ES module in Node.js, CommonJS was the standard for Node.js modules. As a result, many Node.js libraries and modules are written with CommonJS.
A module system allows us to split up our code in different parts or to include code written by other developers.
The ES module format was created to standardize the JavaScript module system. It has become the standard format for encapsulating JavaScript code for reuse.
Since the very beginning of NodeJS, the CommonJS module system is the default module system within the ecosystem. However, recently a new module system was added to NodeJS - ES modules.
<ResourceGroupTitle>Free Content</ResourceGroupTitle>
<BadgeLink colorScheme='yellow' badgeText='Read' href='https://reflectoring.io/nodejs-modules-imports/'>CommonJS vs ESM</BadgeLink>
<BadgeLink colorScheme='yellow' badgeText='Read' href='https://blog.logrocket.com/commonjs-vs-es-modules-node-js/'>CommonJS vs. ES modules in Node.js</BadgeLink>
<BadgeLink colorScheme='yellow' badgeText='Read' href='https://reflectoring.io/nodejs-modules-imports/'>CommonJS vs. ES Modules: Modules and Imports in NodeJS</BadgeLink>

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content/roadmaps/107-nodejs/content/102-nodejs-npm/101-global-install-vs-local-install.md
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# Global Install vs Local Install
NodeJS and NPM allow two methods of installing dependencies/packages: Local and Global. This is mainly used when adding a package or dependency as part of a specific project you're working on. The package would be installed (with its dependencies) in `node_modules` folder **under your project**. In addition, in `package.json` file there will be a new line added for the installed dependency under the label `dependencies`.
At this point - you can start using the package in your NodeJS code by importing the package.
Unlike the local install, you can install packages and dependencies **globally**. This would install it in a system path, and these packages would be available to any program which runs on **this specific** computer. This method is often used for installing command line tools (for example, even `npm` program is a Globally installed npm package).
NodeJS and NPM allow two methods of installing dependencies/packages: Local and Global. This is mainly used when adding a package or dependency as part of a specific project you're working on. The package would be installed (with its dependencies) in `node_modules` folder **under your project**. In addition, in `package.json` file there will be a new line added for the installed dependency under the label `dependencies`. At this point - you can start using the package in your NodeJS code by importing the package. Unlike the local install, you can install packages and dependencies **globally**. This would install it in a system path, and these packages would be available to any program which runs on **this specific** computer. This method is often used for installing command line tools (for example, even `npm` program is a Globally installed npm package).
<ResourceGroupTitle>Free Content</ResourceGroupTitle>
<BadgeLink colorScheme='blue' badgeText='Official Website' href='https://docs.npmjs.com/downloading-and-installing-packages-locally'>Downloading and installing packages locally</BadgeLink>
<BadgeLink colorScheme='blue' badgeText='Official Website' href='https://docs.npmjs.com/downloading-and-installing-packages-globally'>Downloading and installing packages globally</BadgeLink>
<BadgeLink colorScheme='yellow' badgeText='Read' href='https://docs.npmjs.com/cli/v8/commands/npm-install'>NPM Install Docs</BadgeLink>
<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.geeksforgeeks.org/what-is-global-installation-of-dependencies-in-node-js/'>What is global installation of dependencies in Node.js ?</BadgeLink>

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content/roadmaps/107-nodejs/content/106-nodejs-command-line-apps/104-environment-variables/readme.md
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# Environment variables
# Environment variables
<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.geeksforgeeks.org/reading-environment-variables-from-node-js/'>Reading Environment Variables From Node.js</BadgeLink>
<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.twilio.com/blog/working-with-environment-variables-in-node-js-html'>Working With Environment Variables in Node.js
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