Introduction
Node.js has emerged as a popular platform for building scalable and efficient server-side applications. It leverages JavaScript, enabling developers to use their front-end skills on the backend. In this article, we'll explore key aspects of Node.js and how to handle various operations with simple one-liners.
How do you handle asynchronous operations in Node.js?
👉 Answer: Asynchronous operations in Node.js are managed using callbacks, promises, or the concise async/await syntax, ensuring non-blocking code execution.
What is the purpose of the package.json file?
👉 Answer: The package.json file serves as the backbone of a Node.js project. It stores essential metadata, such as dependencies and scripts, making it easier for developers to manage their projects efficiently.
What is the difference between require() and import?
👉 Answer: Node.js supports both CommonJS and ECMAScript modules. Use require() for CommonJS modules, while import is for ECMAScript modules (ESM).
How do you handle file I/O?
👉 Answer: File I/O in Node.js is seamlessly handled using the built-in fs (File System) module, providing methods for reading, writing, and manipulating files.
How do you handle database connections?
👉 Answer: Database connections in Node.js are managed using modules like mysql or mongodb, or ORM libraries like Sequelize or Mongoose, enabling object-oriented database management.
How do you handle real-time communication?
👉 Answer: Real-time communication in Node.js is facilitated using technologies like WebSockets, with libraries such as Socket.IO providing efficient client-server interactions.
What is the event-driven architecture?
👉 Answer: Node.js adopts an event-driven architecture where events trigger callbacks, allowing non-blocking and efficient handling of I/O operations.
What is the purpose of the global object?
👉 Answer: The global object in Node.js provides global variables and functions that are accessible throughout the application, allowing easy data and functionality sharing.
How do you handle errors in Node.js asynchronous code?
👉 Answer: Errors in Node.js asynchronous code are managed using try-catch blocks, error-first callbacks, or the Promise.catch() method in promise-based code.
How do you handle cross-origin resource sharing (CORS)?
👉 Answer: Cross-Origin Resource Sharing (CORS) is managed by utilizing middleware such as the cors package or setting appropriate response headers to allow or restrict cross-origin requests.
What is the purpose of the net module?
👉 Answer: The net module provides networking functionality, allowing for creating TCP servers and clients, enabling network communication in Node.js applications.
How do you handle routing?
👉 Answer: Routing in Node.js is efficiently handled using frameworks like Express.js, where you can define routes using HTTP methods (GET, POST, etc.) and associated handler functions.
What is middleware in the context of Express.js?
👉 Answer: Middleware in Express.js is a function that can intercept and process requests before they reach the final route handler, enabling flexible request handling.
How do you handle form data in Node.js?
👉 Answer: Form data in Node.js is handled using middleware like 'body-parser' in Express.js to parse and extract form data from incoming requests, simplifying form handling.
What is the purpose of the 'path' module?
👉 Answer: The 'path' module provides utility functions for working with file and directory paths, ensuring consistent file operations regardless of the platform.
How do you handle cookies?
👉 Answer: Cookies in Node.js are managed using middleware like 'cookie-parser' in Express.js, enabling the parsing and handling of cookies in HTTP requests and responses.
How do you handle concurrency?
👉 Answer: Concurrency in Node.js is achieved through techniques such as worker threads, the 'cluster' module, or libraries like async or Promise.all() for managing concurrent tasks and parallel execution.
What is the purpose of the EventEmitter?
👉 Answer: The EventEmitter is a core module in Node.js that allows objects to emit and listen for custom events, facilitating robust communication between components.
Conclusion
With these powerful one-liners, you'll be well on your way to mastering Node.js and building efficient and feature-rich applications.
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