Node.JS Overview

Node.js is a popular open-source runtime environment that allows developers to build scalable and high-performance applications using JavaScript. It is built on the V8 JavaScript engine used in the Google Chrome browser, and it allows developers to use JavaScript on the server-side.

Here are some steps to get started with Node.js:

Install Node.js: You can download and install Node.js from the official website. Choose the version that is compatible with your operating system.
Create a simple "Hello World" program: After installing Node.js, create a new file with a ".js" extension and write a simple "Hello World" program in it.
Learn the basics of Node.js: Once you have written your first Node.js program, start learning the basics of Node.js. This includes understanding modules, the Node.js event loop, and how to work with the file system, HTTP requests, and databases.
Build a simple application: After learning the basics, build a simple application to practice your skills. This could be a web application, a command-line tool, or any other type of application that interests you.
Explore the Node.js ecosystem: Node.js has a large ecosystem of modules and libraries that can help you build applications more quickly and efficiently. Explore npm (Node Package Manager), a package manager for Node.js, and find modules that can help you with your application.

How is different from JavaScript?

JavaScript is a programming language that is commonly used in web development to create interactive and dynamic web pages. It is executed in a web browser and can interact with HTML and CSS to provide a rich user experience.

Node.js, on the other hand, is a runtime environment that allows you to run JavaScript code outside of a browser. It uses the same JavaScript language as in the browser, but it provides additional capabilities, such as access to the file system, network and operating system functionality, which are not available in a browser.

Node.js allows developers to use JavaScript on the server-side to build web applications and backend services, in addition to the client-side programming with JavaScript in web browsers. This makes Node.js a popular choice for building server-side applications and APIs, as well as real-time applications, such as chat applications and online games.

Node.js has a different set of APIs and modules than what is available in a web browser environment. For example, in a web browser environment, you can use the window object to manipulate the DOM, while in Node.js, you can use the fs module to read and write files on the file system.

Overall, while JavaScript is primarily used for client-side web development, Node.js extends the use of JavaScript to server-side development and enables the creation of more complex and versatile applications.

When to use NodeJS and JavaScript ?

JavaScript is primarily used for client-side web development, where it runs in a web browser to provide dynamic and interactive web pages. It is also used on the server-side for web development, but its use in that context is generally limited to server-side rendering and web application logic that runs on the server.

Node.js, on the other hand, is used on the server-side to build web applications and backend services using JavaScript. It provides access to operating system resources, network and file system capabilities, which are not available in a web browser environment. This makes Node.js a popular choice for building real-time web applications, APIs, and backend services.

Here are some examples of when to use Node.js and JavaScript:

Use JavaScript:

For client-side web development: JavaScript is the primary language used for client-side web development. It is used to create dynamic and interactive web pages that run in a web browser.
For server-side rendering: JavaScript can be used on the server-side to render web pages dynamically before they are sent to the client's browser.

Use Node.js:

For building web applications: Node.js can be used to build full-stack web applications that run entirely on the server-side. It can handle HTTP requests and responses, and provide API endpoints for client-side web applications.
For building real-time web applications: Node.js is well-suited for building real-time web applications, such as chat applications, multiplayer games, and live data streaming applications.
For building backend services: Node.js can be used to build backend services, such as authentication and authorization services, payment processing services, and data processing services.

In summary, JavaScript is primarily used for client-side web development, while Node.js is used for server-side web development and backend services. Both JavaScript and Node.js are important tools in modern web development, and they are often used together to build full-stack web applications.

Here are some of the core topics for learning Node.js:

JavaScript fundamentals: It's essential to have a good grasp of JavaScript to use Node.js. This includes topics like variables, functions, loops, conditionals, and object-oriented programming.
Node.js basics: This includes understanding the Node.js environment, the event loop, and the core modules that come with Node.js.
Asynchronous programming: Node.js is built on an event-driven, non-blocking I/O model, which means you'll need to learn how to write asynchronous code to take advantage of its performance benefits. This includes using callbacks, Promises, and async/await.
Node.js modules: Node.js has a rich ecosystem of modules and libraries, both built-in and third-party, that can help you build your applications more quickly and efficiently. You'll need to learn how to work with modules, how to import and export code, and how to use npm, the Node.js package manager.
Web development with Node.js: Node.js is commonly used to build web applications, so you'll need to learn how to use frameworks like Express.js and how to work with HTTP requests and responses. You'll also need to learn how to use template engines and how to interact with databases.
Real-time applications: Node.js is well-suited for building real-time applications, such as chat applications and online games. You'll need to learn how to work with WebSockets, Socket.io, and other real-time technologies.
Testing and debugging: Testing and debugging are essential parts of the development process, so you'll need to learn how to write tests and use debugging tools like the Node.js debugger and the Chrome DevTools.
Deployment and scaling: You'll need to learn how to deploy your Node.js applications to production environments, including cloud services like AWS and Heroku. You'll also need to learn how to scale your application to handle increasing traffic and load.

These are just some of the core topics you'll need to cover to become proficient in Node.js development. Keep in mind that the Node.js ecosystem is constantly evolving, so it's important to stay up to date with the latest trends and best practices.

Event Loop

Node.js is built on an event-driven, non-blocking I/O model that enables it to handle a large number of simultaneous connections with high throughput. The event loop is at the core of Node.js' event-driven architecture, and it plays a critical role in how Node.js handles I/O operations.

At a high level, the event loop is a continuous loop that waits for events to occur, processes those events, and then goes back to waiting for more events. When an event occurs, it is added to a queue, and the event loop processes each event in order.

Here's a simplified overview of how the event loop works:

When Node.js starts up, it initializes the event loop and registers a few initial events, such as the 'load' event.
The event loop starts running, waiting for events to occur.
When an event occurs, such as an incoming HTTP request, it is added to the event queue.
The event loop then retrieves the next event from the queue and processes it. This processing can include executing code, making I/O requests, or registering new events.
While the event loop is processing an event, it can also receive new events, which are added to the end of the event queue.
Once an event is processed, the event loop moves on to the next event in the queue.
The event loop continues to run indefinitely, waiting for new events and processing them as they arrive.

The non-blocking I/O model of Node.js allows the event loop to efficiently handle large numbers of concurrent requests. When an I/O operation is initiated, Node.js does not block the event loop. Instead, it returns control to the event loop, which can continue processing other events while the I/O operation completes in the background. Once the I/O operation is complete, a new event is added to the queue to notify the event loop that the operation has finished and that any registered callbacks can be executed.

Overall, the event loop is a key part of Node.js' performance and scalability, and understanding how it works is essential for developing high-performance Node.js applications.

console.log('Start'); setTimeout(() => { console.log('Timeout 1'); }, 0); setImmediate(() => { console.log('Immediate 1'); }); process.nextTick(() => { console.log('Next Tick 1'); }); console.log('End');

When you run this code in Node.js, it will output:

Start End Next Tick 1 Immediate 1 Timeout 1

Here's what's happening:

The console.log('Start') statement is executed, and the string "Start" is printed to the console.
Two asynchronous functions are scheduled to execute: setTimeout and setImmediate. The setTimeout function is passed a callback function that logs "Timeout 1" to the console after 0 milliseconds, and the setImmediate function is passed a callback function that logs "Immediate 1" to the console.
The process.nextTick function is also called, which schedules a function to be executed during the current tick of the event loop. In this case, the function logs "Next Tick 1" to the console.
The console.log('End') statement is executed, and the string "End" is printed to the console.
The event loop then starts processing the queued

Asynchronous programming

Asynchronous programming is a key feature of Node.js, and it allows developers to write non-blocking code that can handle many requests and perform I/O operations efficiently.

In traditional synchronous programming, each line of code is executed in order, and the program waits for each line to complete before moving on to the next one. This can cause the program to block while waiting for I/O operations to complete, which can lead to poor performance.

In asynchronous programming, I/O operations are initiated and then control is immediately returned to the program, allowing it to continue processing other tasks. When the I/O operation completes, a callback function is invoked to handle the result.

Here's an example of asynchronous programming in Node.js using the fs module to read a file:

const fs = require('fs'); console.log('Start'); fs.readFile('example.txt', (err, data) => { if (err) { console.error(err); } else { console.log(data.toString()); } }); console.log('End');

In this example, the fs.readFile() function is used to read the contents of a file named 'example.txt'. This function is asynchronous, so it takes a callback function as its second argument. The callback function is invoked when the file has been read, and it takes two arguments: an error object (if any), and the contents of the file.

The console.log('Start') statement is executed first, followed by the call to fs.readFile(). However, since fs.readFile() is asynchronous, control is immediately returned to the program, and the console.log('End') statement is executed next. The program then continues to run, and the contents of the file are logged to the console when the I/O operation completes and the callback function is invoked.

Asynchronous programming in Node.js is essential for building scalable and efficient applications that can handle a large number of requests and perform I/O operations without blocking the event loop. It requires a different mindset and programming style than traditional synchronous programming, but it can lead to faster and more responsive applications.

Asynchronous programming is a fundamental aspect of Node.js, and it's essential for building high-performance, scalable applications. Node.js is built on an event-driven, non-blocking I/O model, which means that it can handle many requests and I/O operations simultaneously without blocking the event loop. To take advantage of this model, you'll need to learn how to write asynchronous code using callbacks, Promises, and async/await.

Here's a brief overview of each approach:

1. Callbacks: Callbacks are the traditional way of handling asynchronous operations in Node.js. When an asynchronous operation completes, a callback function is invoked to handle the result. Callbacks take two arguments: an error object (if any), and the result of the operation.

// Example of using callbacks

fs.readFile('file.txt', (err, data) => {

if (err) {

console.error(err);

} else {

console.log(data);

}

});

2. Promises: Promises are a more recent addition to the JavaScript language and provide a more elegant way to handle asynchronous operations. Promises are objects that represent the eventual result of an asynchronous operation. They can be in one of three states: pending, fulfilled, or rejected. Promises have a .then() method to handle the result when the Promise is fulfilled, and a .catch() method to handle any errors.

// Example of using Promises const readFilePromise = util.promisify(fs.readFile); readFilePromise('file.txt') .then(data => console.log(data)) .catch(err => console.error(err));

3. async/await: async/await is a more recent addition to the JavaScript language that makes it even easier to write asynchronous code. Async functions are functions that return a Promise, and they use the await keyword to wait for the result of an asynchronous operation. Async functions can use try/catch blocks to handle errors.

// Example of using async/await async function readFileAsync() { try { const data = await readFilePromise('file.txt'); console.log(data); } catch (err) { console.error(err); } } readFileAsync();

All three approaches can be used in Node.js to write asynchronous code, and the choice of which to use depends on your personal preference and the specific requirements of your application. However, it's important to understand the differences between them and choose the one that works best for your particular use case.

Node.js has a vast ecosystem of modules and libraries that can help you build your applications more efficiently. Modules in Node.js are reusable pieces of code that can be imported and used in other parts of your application. Node.js includes several built-in modules, such as the fs (file system) module and the http module, and you can also install and use third-party modules using the Node.js package manager, npm.

Here's an overview of how to work with modules in Node.js:

1. Importing modules: To use a module in your Node.js application, you need to import it. You can import built-in modules using the require() function, like this:

const fs = require('fs'); const http = require('http');

To import a third-party module, you first need to install it using npm, and then you can import it using require(), like this:

const express = require('express');

2. Exporting modules: If you're writing your own module in Node.js, you'll need to export it so that it can be used in other parts of your application. There are two ways to export a module in Node.js:

Using module.exports: You can export an object or a function using module.exports, like this:

function myFunction() { console.log('Hello, world!'); } module.exports = myFunction;

Using exports: You can also use the exports object to export a module, like this:

function myFunction() { console.log('Hello, world!'); } exports.myFunction = myFunction;

3. Using npm: npm is the Node.js package manager, and it allows you to install and manage third-party modules for your Node.js applications. You can use the npm install command to install a module, like this:

npm install express

This will download and install the express module and its dependencies. You can then import and use the module in your application, like this:

const express = require('express'); const app = express();

Node.js modules are an essential aspect of building applications in Node.js, and understanding how to work with them is crucial for developing efficient and maintainable code.

Node.js is a popular choice for building web applications because it's fast, efficient, and scalable. To build web applications with Node.js, you'll typically use a web framework like Express.js, which provides a set of tools and utilities for building web applications.

Here are some of the key concepts and skills you'll need to learn for web development with Node.js:

Working with HTTP requests and responses: In web development, the Hypertext Transfer Protocol (HTTP) is used to exchange data between the web server and client. Node.js provides a built-in http module that you can use to create an HTTP server and handle HTTP requests and responses. You'll need to learn how to work with HTTP methods like GET, POST, PUT, and DELETE, and how to handle errors and exceptions.
Using Express.js: Express.js is a popular web framework for Node.js that provides a set of tools and utilities for building web applications. It simplifies many of the common tasks involved in web development, such as routing, middleware, and handling requests and responses. You'll need to learn how to use Express.js to create routes, handle middleware, and interact with databases.
Using template engines: Template engines are tools that allow you to generate HTML dynamically based on data from your application. Express.js supports several popular template engines, such as Pug, EJS, and Handlebars. You'll need to learn how to use template engines to create dynamic views and render data to the client.
Interacting with databases: Most web applications require some form of persistent data storage, and Node.js provides several ways to interact with databases. You can use the built-in fs module to read and write data to files, or you can use a database system like MongoDB, MySQL, or PostgreSQL. You'll need to learn how to use database drivers and ORM libraries to interact with databases and perform CRUD (Create, Read, Update, Delete) operations.

Overall, web development with Node.js requires a solid understanding of web development concepts like HTTP, routing, middleware, and database integration, as well as specific tools and frameworks like Express.js, template engines, and database drivers. With these skills, you can build fast, efficient, and scalable web applications using Node.js.

Real-time applications

Real-time applications require a different approach to web development because they involve two-way communication between the client and server. Unlike traditional web applications, where the server sends a response to the client and then waits for another request, real-time applications require the server to send updates to the client in real-time as new data becomes available.

Node.js is well-suited for building real-time applications because it supports non-blocking I/O and event-driven programming, which allows for efficient and scalable handling of many simultaneous connections. To build real-time applications with Node.js, you'll need to learn how to work with real-time technologies like WebSockets and Socket.io.

Here are some key concepts and skills you'll need to learn for building real-time applications with Node.js:

WebSockets: WebSockets are a protocol that allows for bi-directional, real-time communication between the client and server. Unlike traditional HTTP requests, WebSockets maintain a persistent connection between the client and server, allowing for real-time updates. Node.js provides a built-in ws module for working with WebSockets.
Socket.io: Socket.io is a popular library for building real-time applications with Node.js. It provides a simple and elegant API for working with WebSockets and other real-time technologies, and it supports fallbacks to other technologies like long-polling for clients that don't support WebSockets. Socket.io also provides features like rooms and namespaces for organizing and managing real-time connections.
Event-driven programming: Real-time applications require efficient handling of many simultaneous connections, and Node.js's event-driven programming model is well-suited for this. With event-driven programming, the server can handle many connections in parallel without blocking, and it can respond to events as they occur in real-time.
Scalability: Real-time applications can be highly scalable, but they also require careful design and architecture to handle many simultaneous connections. Node.js provides several tools and techniques for building scalable real-time applications, such as clustering, load balancing, and horizontal scaling.

Overall, building real-time applications with Node.js requires a solid understanding of real-time technologies like WebSockets and Socket.io, as well as event-driven programming and scalability. With these skills, you can build fast, efficient, and scalable real-time applications using Node.js.

Testing and debugging

Testing and debugging are critical parts of the development process for any software project, including Node.js applications. Testing ensures that your code works as expected and helps catch errors and bugs early in the development cycle, while debugging is the process of identifying and fixing errors and bugs in your code.

In Node.js, you can use a variety of tools and frameworks for testing and debugging, depending on your needs and preferences. Here are some key concepts and skills you'll need to learn:

Testing frameworks: There are several testing frameworks available for Node.js, including Mocha, Jasmine, and Jest. These frameworks provide tools for writing and running tests, as well as features like assertions, test runners, and test suites.
Assertions: Assertions are statements that test whether a condition is true or false. In Node.js, you can use built-in assertions or assertion libraries like Chai or Assert.js to write tests that check whether your code is working as expected.
Mocking and stubbing: Sometimes you need to simulate certain parts of your application, such as external APIs or databases, in your tests. Mocking and stubbing allow you to replace parts of your code with test-specific versions that mimic the behavior of the real thing.
Debugging tools: Node.js provides a built-in debugger that allows you to step through your code and inspect variables and function calls. You can also use the Chrome DevTools to debug Node.js applications, which provides a more graphical and interactive interface.
Code coverage: Code coverage is a measure of how much of your code is covered by tests. Tools like Istanbul or nyc allow you to generate code coverage reports that show you which parts of your code are covered by tests and which parts are not.

Overall, testing and debugging are essential skills for any Node.js developer. By learning how to write tests, use assertions, and debug your code effectively, you can ensure that your Node.js applications are reliable, maintainable, and bug-free.

Deployment and scaling

Deployment and scaling are critical aspects of building a production-ready Node.js application. Deploying an application refers to the process of getting your application running on a server or a cloud-based infrastructure that can serve your application to end-users. Scaling an application refers to the process of making your application handle increasing traffic and load.

Here are some key concepts and skills you'll need to learn for deployment and scaling:

Production environments: You'll need to be familiar with the infrastructure and configuration requirements of production environments. This includes knowledge of operating systems, web servers, load balancers, and other components that make up a production stack.
Cloud services: Cloud services like AWS and Heroku provide infrastructure and services that can simplify the deployment and scaling process. You'll need to learn how to set up and manage cloud-based resources, such as virtual machines, databases, and load balancers.
Configuration management: Configuration management tools like Puppet and Chef allow you to automate the process of setting up and configuring your production infrastructure. These tools can help you manage configuration files, install software packages, and automate routine tasks.
Load balancing: Load balancing is a technique used to distribute traffic evenly across multiple servers. You'll need to learn how to set up and configure load balancers, such as Nginx or HAProxy, to ensure that your application can handle increasing traffic.
Performance optimization: To ensure that your application can handle increasing traffic and load, you'll need to optimize its performance. This includes techniques like caching, compression, and database optimization.

Overall, deployment and scaling are critical skills for any Node.js developer building a production-ready application. By learning how to deploy and scale your application effectively, you can ensure that your application is available, reliable, and performs well under increasing traffic and load.

deployment and scaling in Node.js:

Production environments: To deploy and run a Node.js application in production, you'll need to be familiar with the infrastructure and configuration requirements of production environments. This includes knowledge of operating systems, web servers, load balancers, and other components that make up a production stack. For example, you'll need to know how to set up and configure a web server like Nginx or Apache to serve your Node.js application.
Cloud services: Cloud services like AWS and Heroku provide infrastructure and services that can simplify the deployment and scaling process. With these services, you can quickly and easily set up virtual machines, databases, and load balancers, without having to manage the underlying infrastructure. To use cloud services effectively, you'll need to learn how to set up and manage cloud-based resources, such as virtual machines, databases, and load balancers. You'll also need to understand the pricing and billing models of cloud services, to ensure that your application is cost-effective.
Configuration management: Configuration management tools like Puppet and Chef allow you to automate the process of setting up and configuring your production infrastructure. These tools can help you manage configuration files, install software packages, and automate routine tasks. Configuration management is especially useful when managing large-scale production environments, where manual configuration can be time-consuming and error-prone.
Load balancing: Load balancing is a technique used to distribute traffic evenly across multiple servers. In a production environment, you'll likely have multiple instances of your Node.js application running on different servers. To ensure that traffic is distributed evenly and that your application can handle increasing traffic, you'll need to set up and configure a load balancer, such as Nginx or HAProxy. The load balancer can distribute incoming traffic across multiple instances of your application, and can also handle failover and recovery in case one of the instances goes down.
Performance optimization: To ensure that your application can handle increasing traffic and load, you'll need to optimize its performance. This includes techniques like caching, compression, and database optimization. Caching involves storing frequently-accessed data in memory or on disk, so that it can be retrieved more quickly. Compression involves reducing the size of files and data sent over the network, to reduce network latency and bandwidth usage. Database optimization involves tuning the database configuration and queries to ensure that they are efficient and can handle increasing load.

What is Node.js and how does it differ from other web technologies?
What are the benefits of using Node.js?
How would you define asynchronous programming?
How does Node.js handle asynchronous operations?
What is the Event Loop in Node.js?
How do you handle errors in Node.js?
What are callbacks in Node.js?
Can you explain the difference between callback and promises in Node.js?
What are the different data types in Node.js?
How does Node.js handle I/O operations?
Can you explain the role of NPM in Node.js?
What are the different modules in Node.js?
How do you create and use custom modules in Node.js?
Can you explain the concept of middleware in Node.js?
What is Express.js and how does it work with Node.js?
What are the different HTTP methods in Node.js?
Can you explain the difference between PUT and POST methods?
How do you handle routing in Node.js?
How does Node.js handle file system operations?
Can you explain the difference between blocking and non-blocking I/O in Node.js?
What is the purpose of the package.json file in Node.js?
How do you create a package.json file?
What are the different types of events in Node.js?
Can you explain the EventEmitter class in Node.js?
What are streams in Node.js?
How does Node.js handle encryption and decryption?
What are the different types of streams in Node.js?
How do you use streams in Node.js?
Can you explain the concept of piping in Node.js?
What are child processes in Node.js?
How do you create a child process in Node.js?
What is the purpose of the cluster module in Node.js?
Can you explain how to handle sessions in Node.js?
What is the difference between cookies and sessions in Node.js?
How do you create a RESTful API in Node.js?
Can you explain how to handle authentication in Node.js?
What are the different types of databases that can be used with Node.js?
Can you explain how to connect to a MongoDB database using Node.js?
How do you handle validation in Node.js?
Can you explain the concept of middleware in the context of Express.js?
What are the different types of middleware in Express.js?
How do you handle CORS in Node.js?
Can you explain the concept of web sockets in Node.js?
What is the purpose of the Socket.IO library in Node.js?
Can you explain how to use the Socket.IO library in Node.js?
What is the purpose of the Mocha testing framework in Node.js?
How do you write unit tests in Node.js using Mocha?
What is the purpose of the Chai assertion library in Node.js?
How do you write integration tests in Node.js using Chai?
Can you explain the concept of mocking in Node.js testing?
How do you use Sinon.js for mocking in Node.js testing?
What is the purpose of the Supertest library in Node.js testing?
How do you use Supertest for integration testing in Node.js?
What are the different types of HTTP status codes in Node.js?
How do you handle errors in Node.js?
Can you explain the concept of JWT (JSON Web Tokens) in Node.js?
How do you implement authentication using JWT in Node.js?
What is the purpose of the Helmet middleware in Node
Can you explain the difference between synchronous and asynchronous code execution in Node.js?
How do you handle errors in Node.js?
What is a Promise in Node.js? Can you give an example of using Promises?
Can you explain the concept of streams in Node.js?
What is a middleware in Node.js? How is it used in Express.js?
Can you explain the concept of clustering in Node.js?
What are the different types of Node.js modules?
How do you handle sessions in Node.js?
Can you explain the concept of callbacks in Node.js?
What is the difference between Node.js and other server-side languages like Java or Python?
Can you explain the role of NPM in Node.js?
Can you explain how to use Node.js with MongoDB?
How do you handle authentication and authorization in Node.js?
What is a Node.js REPL?
How do you use child processes in Node.js?
Can you explain the concept of garbage collection in Node.js?
How do you implement caching in Node.js?
Can you explain the difference between PUT and POST requests in Node.js?
How do you deploy Node.js applications on a production server?
Can you explain the concept of web sockets in Node.js?
How do you handle file uploads in Node.js?
What is the role of the fs module in Node.js?
How do you handle file I/O operations in Node.js?
Can you explain the concept of middleware chaining in Node.js?
How do you use the npm package nodemon for development?
What are the different types of testing in Node.js?
How do you use the assert module in Node.js?
Can you explain how to use the async module in Node.js?
How do you use the request module in Node.js?
Can you explain the concept of callback hell in Node.js?
How do you handle form data in Node.js?
Can you explain how to use the ejs template engine in Node.js?
What is the role of the cluster module in Node.js?
How do you use the https module in Node.js?
Can you explain the concept of the Event Emitter in Node.js?
How do you use the crypto module in Node.js?
Can you explain the difference between let, const, and var in Node.js?
What is the role of the path module in Node.js?
How do you use the express.Router() method in Express.js?
Can you explain how to use the morgan middleware in Node.js?
How do you handle cookies in Node.js?
Can you explain the concept of the factory pattern in Node.js?
How do you use the Sequelize ORM in Node.js?
Can you explain the role of the net module in Node.js?
How do you use the Nodemailer module in Node.js?
Can you explain the concept of JWT in Node.js?
How do you use the body-parser middleware in Node.js?
How do you use the Passport middleware in Node.js?
Can you explain the concept of debugging in Node.js?
How do you use the Winston logging module in Node.js?
How do you use the Node.js cluster module for load balancing?
Can you explain how to use the Node.js REPL for debugging?
How do you use the Node.js vm module for sandboxing?
How do you use the Node.js child_process module for
How do you manage dependencies in Node.js?
What is the role of package.json in a Node.js project?
What is the difference between global and local modules in Node.js?
How do you use environment variables in Node.js?
How do you handle errors in a Node.js application?
How do you manage sessions in a Node.js application?
What is middleware in Express.js?
What is the difference between PUT and POST requests in Node.js?
How do you implement authentication in a Node.js application?
How do you handle file uploads in a Node.js application?
What is the purpose of the Node.js cluster module?
How do you implement caching in a Node.js application?
What are the benefits of using a task runner like Grunt or Gulp in a Node.js project?
How do you implement pagination in a Node.js application?
How do you implement security measures in a Node.js application?
How do you implement internationalization in a Node.js application?
How do you implement search functionality in a Node.js application?
What is the purpose of the Node.js repl module?
How do you handle authentication and authorization in a Node.js application?
What are some common security vulnerabilities in a Node.js application and how do you prevent them?
How do you implement server-side rendering in a Node.js application?
What is the purpose of the Node.js fs module?
How do you handle database migrations in a Node.js application?
What is the purpose of the Node.js buffer module?
How do you implement a RESTful API in a Node.js application?
How do you implement websockets in a Node.js application?
How do you implement real-time updates in a Node.js application?
How do you handle long-running tasks in a Node.js application?
What is the purpose of the Node.js net module?
How do you handle concurrency in a Node.js application?
How do you implement serverless architecture with Node.js?
What is the purpose of the Node.js child process module?
How do you implement message queuing in a Node.js application?
How do you handle load balancing in a Node.js application?
What is the purpose of the Node.js http module?
How do you implement cross-site scripting (XSS) prevention in a Node.js application?
How do you handle application configuration in a Node.js application?
What are some best practices for logging in a Node.js application?
How do you implement rate limiting in a Node.js application?
How do you handle and prevent memory leaks in a Node.js application?