Node.js Basics: The Core Foundation

Install and verify Node.js by downloading the LTS or current version from nodejs.org, then use the Node.js CLI and REPL to run JavaScript in your terminal.

Master the Node.js file system (fs) core module to write, read, and delete files with callbacks. Run app.js with node to work on example.txt using UTF-8 encoding.

Explore the node global object, using console and console.log, and leverage process methods for stdout write and standard input to read data and exit.

Use the readline module in node.js to prompt user input with rl.question and a callback, log the answer, and exit with process.exit, via an interface using process.stdin and process.stdout.

Learn to use the base module and its base name method to get the last part of a path, build absolute paths with path.join, and log with util for timestamps.

Learn to build reusable custom modules in node.js by creating a logger module with appendFile, exporting default and named properties, and importing via require in main.js.

Export and import a custom module in node.js using default and named exports, test with console.log, and use require in the main file, while the path module retrieves file extensions.

Explore listing files and directories with the fs module in node.js, including importing fs, reading the current directory, and logging the results.

Learn to read files in Node.js using the fs readFileSync method, handle buffers by setting encoding to utf-8, and print text with console.log.

Learn how to write and append data to files in node.js using the fs.writeFile function, handle errors, and understand file replacement versus appending.

Learn how to create directories in Node.js using the file system module, using mkdir and fs.existsSync to avoid 'directory exists' errors, and run main.js to see the results.

Learn how to rename, move, and delete files in Node.js using the fs module's renameSync and unlink methods. Practice applying these operations across directories and paths to manage file lifecycles.

Learn to rename, move, and remove directories in node.js using fs.renameSync, manage directory structures like images, and handle cleanup by removing contents before deletion.

Learn how Node.js streams enable asynchronous data handling via read stream from the file system module, reading text chunk by chunk with utf-8 encoding and handling data and end events.

Use the Node.js file system module to create a writable stream and copy data from a readable stream into a text_copy file. Connect read and write streams and close afterward.

Attach a writable stream to a readable stream and pass data through pipes to write into a file in one line, while logging errors via an error event listener.

Start a new NodeJS project with npm and learn to verify your npm version. Create the package.json by answering prompts or using npm init -y for quick defaults.

Install and use external modules with npm as lodash is added to dependencies, imported with require, and used to sort an array and print results.

Install, update, and manage npm packages like lodash, check for outdated dependencies, and use npm install, npm outdated, and npm update to keep projects secure and up to date.

Differentiate between dependencies and dev dependencies in a node.js project, demonstrate npm install saving to dependencies or dev dependencies, and use moment for date formatting and eslint for development checks.

Use npm scripts to run the project with npm run start, instead of invoking node directly. Add nodemon as a dev dependency to auto restart index.js on changes.

Explore callbacks as functions passed to other functions to handle asynchronous tasks in JavaScript. See an example with fetchdata, using setTimeout to simulate a two second delay and log results.

Learn how to use promises to handle asynchronous operations in JavaScript, including creating a promise with new Promise, resolving and rejecting, chaining then methods, and catching errors.

Explore async/await in node for clean promise handling by implementing getdata with fetch data, using await to pause until resolution, and employing try/catch for errors.