Category: Node JS Interview Question and Answer

No, it is not possible to access DOM in Node.

The control flow does the following job:

Control flow function is a generic piece of code that runs in between several asynchronous function calls.

Yes, Node.js provides a simple TCP based protocol and built-in debugging client. For debugging your JavaScript file, you can use debug argument followed by the js file name you want to debug. Syntax:

To avoid callbacks, you can use any one of the following options:

All the API’s of Node.js library are asynchronous means non-blocking. A Node.js based server never waits for an API to return data. The Node.js server moves to the next API after calling it, and a notification mechanism of Events of Node.js responds to the server for the previous API call.

Error-first callbacks are used to pass errors and data. If something goes wrong, the programmer has to check the first argument because it is always an error argument. Additional arguments are used to pass data.

In general, a buffer is a temporary memory mainly used by the stream to hold on to some data until it is consumed. Buffers are used to represent a fixed-size chunk of memory allocated outside of the V8 JavaScript engine. It can’t be resized. It is like an array of integers, which each represents a…

In Node.js applications, modules are like JavaScript libraries and include a set of functions. To include a module in a Node.js application, we must use the require() function with the parentheses containing the module’s name. Node.js has several modules which are used to provide the basic functionality needed for a web application. Following is a…

See the following example of using async-await pattern: