node.js

What is Node.js?

Node.js is an open-source, cross-platform runtime environment that executes JavaScript code outside a web browser.

What is the primary use of Node.js?

Node.js is primarily used for building scalable network applications, especially web servers and APIs.

What is npm in Node.js?

npm (Node Package Manager) is a package manager for Node.js, allowing users to install and manage packages that can be used in their applications.

How does Node.js handle asynchronous operations?

Node.js handles asynchronous operations using a single-threaded event loop, which allows for non-blocking I/O operations.

What is Express.js?

Express.js is a web application framework for Node.js designed for building web applications and APIs with minimal setup.

What is a callback function in Node.js?

A callback function is a function passed as an argument to another function, which is then invoked after the completion of an asynchronous operation.

What is the purpose of the package.json file?

The package.json file contains metadata about a Node.js project, including the project's dependencies, scripts, and version.

What is middleware in Express.js?

Middleware in Express.js refers to functions that have access to the request and response objects, used to modify requests or responses and to end the request-response cycle.

How can you create a server in Node.js?

You can create a server in Node.js using the built-in 'http' module and by calling 'http.createServer()' to create a server instance.

What is the purpose of the event emitter in Node.js?

The event emitter is a pattern in Node.js that allows objects to emit events and listen for those events, enabling asynchronous event handling.

What is Node.js?

Node.js is an open-source, cross-platform runtime environment that executes JavaScript code outside a web browser.