Node Js Interview Questions And Answers

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Top Node Js interview questions and answers for freshers and experienced

What is Node Js ?

Answer : Node.js is an event-based, non-blocking, asynchronous I/O framework that uses Google\'s V8 JavaScript engine

Questions : 1 :: What is the purpose of Node.js module.exports and how do you use it?

module.exports is the object that's actually returned as the result of a require call.The exports variable is initially set to that same object (i.e. it's a shorthand "alias"), so in the module...View answers

Questions : 2 :: How do you extract POST data in node.js?

HTML: <form method="post" action="/"> <input type="text" name="user[name]"> <input type="text" name="user[email]"> <input type="submit"...View answers

Questions : 3 :: How to decide when to use Node.js?


Node.js consider to be used in specific scenario. If your app does not fit into that scenario you should not consider it for your app development.When to use Node.JS If your server side code...View answers

Questions : 4 :: how to write files in Node.js?

Currently there are 3 ways to write a file: fs.write(fd, buffer, offset, length, position, [callback]) You need to wait for the callback to ensure that the buffer is written to disk. It's not...View answers

Questions : 5 :: How to debug Node.js applications?

There are a few tools and ways out there: => Joyent's Guide Joyent now maintains their own debugging guide. It's worth a look. =>Interactive Stack Traces with traceGL =>Profiling with...View answers

Questions : 6 :: How to get GET (query string) variables in Express on node.js?


var url = require('url');var url_parts = url.parse(request.url, true);var query = url_parts.query;

Questions : 7 :: What is node.js?

Node.js is a Server side scripting which is used to build scalable programs. Its multiple advantages over other server side languages, the prominent being non-blocking...View answers

Questions : 8 :: How node.js works?

Node.js works on a v8 environment, it is a virtual machine that utilizes JavaScript as its scripting language and achieves high output via non-blocking I/O and single threaded event...View answers

Questions : 9 :: What do you mean by the term I/O ?


i/O is the shorthand for input and output, and it will access anything outside of your application. It will be loaded into the machine memory to run the program, once the application is...View answers

Questions : 10 :: What does event-driven programming mean?

In computer programming, event driven programming is a programming paradigm in which the flow of the program is determined by events like messages from other programs or threads. It is an...View answers

Questions : 11 :: Where can we use node.js?

Node.js can be used for the following purposes a)      Web applications ( especially real-time web apps ) b)      Network...View answers

Questions : 12 :: What is the advantage of using node.js?

a)      It provides an easy way to build scalable network programs b)      Generally fast c)       Great...View answers

Questions : 13 :: What is 'Callback' in node.js?

Callback function is used in node.js to deal with multiple requests made to the server. Like if you have a large file which is going to take a long time for a server to read and if you...View answers

Questions : 14 :: What does it mean "non-blocking" in node.js?

In node.js “non-blocking” means that its IO is non-blocking.  Node uses “libuv” to handle its IO in a platform-agnostic way. On windows, it uses completion...View answers

Questions : 15 :: What are the pros and cons of Node.js?

Pros: a)      If your application does not have any CPU intensive computation, you can build it in Javascript top to bottom, even down to the database level if you...View answers

Questions : 16 :: How to parse JSON using Node.js?

simply use JSON object: JSON.parse(str);JSON.parse. node.js is built on V8, which provides the global object JSON[docs]. The definition of the JSON object is part of the ECMAScript 5...View answers

Questions : 17 :: Can we use jQuery with Node.js?

No. It's going to be quite a big effort to port a browser environment to node.Another approach, that I'm currently investigating for unit testing, is to create "Mock" version of jQuery...View answers

Questions : 18 :: How to get started with Node.js?

First, learn the core concepts of Node.js:You'll want to understand the asynchronous coding style that Node encourages.Async != concurrent. Understand Node's event loop!Node uses...View answers

Questions : 19 :: Explain Node.js Architecture?

There are four building blocks that constitute Node.js. First, Node.js encapsulates libuv to handle asynchronous events and Google’s V8 to provide a run-time for JavaScript. Libuv is...View answers

Questions : 20 :: Is Node.js on multi-core machines?

Yes, Node.js is one-thread-per-process. This is a very deliberate design decision and eliminates the need to deal with locking semantics. If you don't agree with this, you probably don't...View answers

Questions : 21 :: Are you sure node.js execute system command synchronously?

There's an excellent module for flow control in node.js called asyncblock. If wrapping the code in a function is OK for your case, the following sample may be considered:var asyncblock =...View answers

Questions : 22 :: Tell me how to use underscore.js as a template engine?

Everything you need to know about underscore template is here. Only 3 things to keep in mind:<% %> - to execute some code<%= %> - to print some value in template<%- %> - to...View answers

Questions : 23 :: Do you know what mean stack means?

MEAN stack stands for MongoDB-Express-AngularJS-NodeJS. First of all, MEAN is JS-only environment. Express is one of the most popular web app frameworks for NodeJS. Node.JS development...View answers

Questions : 24 :: What is the difference between Node.js vs Ajax?

The difference between Node.js and Ajax is that, Ajax (short for Asynchronous Javascript and XML) is a client side technology, often used for updating the contents of the page without...View answers

Questions : 25 :: Mention the steps by which you can async in Node.js?

By following steps you can async Node.js a)      First class functions b)      Function...View answers

Questions : 26 :: What are the two arguments that async.queue takes?

The two arguments that async.queue takes a)      Task function b)      Concurrency...View answers

Questions : 27 :: Why node.js is quickly gaining attention from JAVA programmers?

Node.js is quickly gaining attention as it is a loop based server for JavaScript. Node.js gives user the ability to write the JavaScript on the server, which has access to things like HTTP...View answers

Questions : 28 :: Using the event loop what are the tasks that should be done asynchronously?

a)      I/O operations b)      Heavy computation c)       Anything requiring...View answers

Questions : 29 :: Explain the steps how "Control Flow" controls the functions calls?

a)      Control the order of execution b)      Collect data c)       Limit...View answers

Questions : 30 :: Why Node.js is single threaded?

For async processing, Node.js was created explicitly as an experiment. It is believed that more performance and scalability can be achieved by doing async processing on a single thread...View answers

Questions : 31 :: What are the two types of API functions in Node.js ?

The two types of API functions in Node.js are a)      Asynchronous, non-blocking functions b)      Synchronous, blocking...View answers

Questions : 32 :: What tool and IDE is used for Node.js?

=>Nodeclipse Enide Studio=>JetBrains WebStorm=>JetBrains IntelliJ IDEA=>Microsoft Visual Studio with TypeScript=>NoFlo – flow-based...View answers

Questions : 33 :: How to handle the "Unhandled exceptions" in Node.js?

It can be caught at the "Process level" by attaching a handler for uncaughtException event.Example: process.on('uncaughtException', function(err) {...View answers

Questions : 34 :: Is Nodejs really Single-Threaded

Node.js operates on single-thread, but using non-blocking I/O calls allows it to support many concurrent connections. That means node doen't process the...View answers

Questions : 35 :: Can you explain what is Globals in Nodejs

Global, Process and Buffer are combinedly termed as Globals.Global : Its a global namespace objectProcess : Its also a global object but it provides essential...View answers

Questions : 36 :: What is the Use of underscore in Nodejs?

To access the last expression, we have to use the (_) underscore/underline...View answers

Questions : 37 :: Can you create Http Server in Nodejs, explain with code

Yes, we can create Http Server in Nodejs. We can use http-server command to do so.Code :var http = require('http');var requestListener = function (request,...View answers

Questions : 38 :: Can you explain the difference between readFile vs createReadStream in Nodejs

readFile - It will read the file completely into memory before making it available to the User.createReadStream - It will read the file in chunks of the size...View answers
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