Node.js is a JavaScript runtime built on Chrome’s V8 JavaScript engine. Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient. Node.js’ package ecosystem, npm, is the largest ecosystem of open source libraries in the world.
What are the benefits of using Node.js?
Node.js is fast and scalable. It is suitable for real-time applications. Node.js is open source and has a large community. Node.js has a rich set of libraries and frameworks.
What are some of the drawbacks of using Node.js?
Node.js is a single-threaded platform. It is not suitable for CPU-intensive applications. Node.js applications are vulnerable to security attacks.
What is the event loop in Node.js?
The event loop is a mechanism that allows Node.js to perform non-blocking I/O operations. When an I/O operation is performed, the event loop will wait for the operation to be completed before moving on to the next operation.
What is a callback function in Node.js?
A callback function is a function that is passed as an argument to another function. The callback function is called when the operation is completed.
What is a promise in Node.js?
A promise is an object that represents the result of an asynchronous operation. A promise can be either fulfilled or rejected. If the operation is successful, the promise is fulfilled. If the operation fails, the promise is rejected.
What are some of the most popular Node.js frameworks?
Some of the most popular Node.js frameworks are Express, Koa, and Hapi.