Q1. What is Node.js?
Node.js is an open-source, cross-platform JavaScript runtime environment built on Chrome's V8 JavaScript engine. It allows developers to run JavaScript code outside of a web browser, on servers or local machines. Node.js uses an event-driven, non-blocking I/O model, making it lightweight and efficient for building scalable network applications.
Q2. Who created Node.js and when?
Node.js was created by Ryan Dahl in 2009. He was inspired by the limitations of traditional web servers that used blocking I/O. He combined the V8 engine, an event loop, and a low-level I/O library to create Node.js. The first version was released at the JSConf Europe conference in 2009.
Q3. What are the key features of Node.js?
Key features include: asynchronous and event-driven architecture, non-blocking I/O, single-threaded with event loop, cross-platform compatibility, large ecosystem of npm packages, and built-in modules for HTTP, file system, and networking. It's ideal for real-time applications, APIs, and microservices.
Q4. What type of applications can you build with Node.js?
Node.js is versatile and can build various applications: RESTful APIs and microservices, real-time applications (chat, gaming), streaming applications, command-line tools, web servers, and even desktop applications with Electron. It's particularly good for I/O-intensive applications but not ideal for CPU-intensive tasks.
Q5. Is Node.js a programming language or a framework?
Node.js is neither a programming language nor a framework. It's a runtime environment that allows JavaScript to run on the server-side. JavaScript is the programming language, and frameworks like Express.js run on top of Node.js. Think of Node.js as the platform that executes JavaScript code outside the browser.