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Node.js Interview Questions and Answers

Node.js Interview Questions and Answers

April 3rd, 2019

Node.js Interview Questions and Answers

In case you’re searching for Node.js  Interview Questions and Answers for Experienced or Freshers, you are at the correct place. Node JS Interview Questions and Answers listed below are prepared by the experts which you can easily understand and simple to remember. The entire question list is thoroughly researched and prepared that gives a great potential to the candidates. With the help of all these questionnaires, anyone can build a simple or complex web application. Based on the difficulty levels, questions are divided into 3 segments which are Beginners level, Moderate level and Advanced level. The topics covered are Node JS Features & Benefits, Prototypes, Importing & Exporting Modules, Callback, I/O systems, Data Types, Creation of server in Node JS and so on. If you are good in cracking the interview by referring these questions, you can easily get into the roles like Node.js Developer, Full Stack Developer, Application Developer, Backend Developer, and JavaScript Developers.

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Best Node.js Interview Questions and Answers

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Q1) What is node.js?

Answer: Node.js is a server side scripting that can be used to create advanced programs. Its many advantages
Other server side languages, mainly non-blocking I / O.

Q2) How does node.js work?

Answer: Node.js runs in a V8 environment, a virtual machine that uses JavaScript as scripting
Language and non-blocking I / O and single threaded event reaches high output through the loop.

Q3) What does the term I / O mean?

Answer: I / O is the shorthand for input and output, which will access anything outside of your application. This will happen
Once the application is started, the machine will be loaded to run the program.

Q4) What does event-driven programming mean?

Answer: In computer programming, event driven programming is a programming paradigm with flow
The program is determined by events such as messages from other projects or texts. it is a
The application structure technique is split into two sections 1) Event selection 2) Event handling

Q5) Where can we use node.js?

Answer: Node.js can be used for the following purposes

  • Web applications (especially real-time web applications)
  • network applications
  • Distributed systems
  • general purpose applications

Q6) What is the benefit of using node.js?


  • This is the easiest way to create measurable network schemes
  • Generally fast
  • better integration
  • everything that is not asynchronous
  • There are almost no blocks

Q7) Types of API functions in Node.js?

Answer: Node.js has two types of API functions

  • Asynchronous, non-preventive operations
  • synchronize and prevent operations

Q8) What is the control flow function?

Answer: Many asynchronous function is known as a common piece of code running between calls
Control flow functionality.

Q9) Explain how “Control Flow” controls functional calls.


  • Control the execution order
  • Collect data
  • integration limit
  • Call the next step in the program

Q10) Why is Node.js single thread?

Answer: For the Async process, Node.js was created explicitly as a test. It is very much believed
Performance and scaling can be achieved through a single oscillation process
Typical web loads than regular thread-based implementation.

Q11) Does the node run in windows?

Answer: Yes, it does.

Q12) Can you access the DOM terminal?

Answer: No, you can not access the DOM terminal.

Q13) What are the tasks to do with the use of the Event Ring?


  •  I / O Functions
  •  heavy calculation

Q14) Why do node.js quickly draw from JavaScript programmers?

Answer: Node.js draws attention because this is a loop-based server for JavaScript. Node.js gives the user
The ability to write javascript on the server, accessing the HTTP stack, file I / O, TCP etc.
And databases.

Q15) What are the two discussions that take async.queue?

Answer: Async.queue two arguments

  •  task function
  •  the value of the individual

Q16) What is an event cycle in Node.js?

Answer: Modify call events to activate and manipulate external events
Used. So, in the I / O calls, node.js can switch from another request.

Q17) Can you specify steps that can be single-tuned in Node.js?

Answer: You can async Node.js with the following steps

  • First Class Activities
  • Operational system
  •  counters
  •  Event loops

Q18) What is the benefit of Node.js?


  •  If you do not have any CPU intensive computation in your application, you can create it with JavaScript, If you use JSON Storage Object DB, such as MonDO DB, above the database level below,
  •  Crawlers receive a response from a complete HTML code, not a SEO friendship, Single page usage or a websockets app run over Node.js.


  • Any serious CPU calculation prevents the responsiveness of node.js, so there is a distorted base Best approach.
  • Using relational databases associated with Node.js is considered less favorable

Q19) How does Node.js violate the issue of blocking I / O operations?

Answer: Node.js uses the event-based model at its center using an event loop to solve this problem

Q20) What is the difference between Node.js against Ajax?

Answer: The difference between Node.js and Ajax is AJAX (short for Asynchronous JavaScript and XML)
Client-side technology is often used to update the contents of the page without refreshing.
When Node.js server software javascript, server software is used for developing. Node.js can not be run
In the browser but through the server.

Q21) What are the challenges with Node.js?

Answer: On the technical side, it’s a bit of a challenge to Node.js to have a process
A scalable thread on a multi-core server.

Q22) What does it mean to be “block-prevention” in node.js?

Answer: In “Node.js”, “Block-resistance” refers to blocking its IO. The moment uses “libuv” to handle its IO.
Site-acoustic way In windows, it utilizes complete ports for Unic, which uses epoll or kqueue.
Creates an unblock request and puts it within the so-called event ring on the request.
JavaScript ‘request’ in the main javascript thread.

Q23) What is the command used for node.js to export external libraries?

Answer: The command to import external libraries is “required”, for example, “var http = required (” http “).
This will load the HTTP library and the single exported item through the http variable.

Q24) Do you specify the structure commonly used in node.js?

Answer: “Express” is a common configuration used in node.js

Q25) What is ‘Callback’ in Node.js?

Answer: The callback function is used in node.js to handle many of the server’s requests. If you have
The server is going to take a long time to read a big file and if you do not want to get a server When dealing with other requests, read that big file and repeat the function. Call the backup function allows the server to cope with the pending request first and a function is called when it is present Concluded.

Q26) What is the relationship of Node.js with JavaScript?


  • Node.js is not a javascript framework, and many of its modules are written here.
  • It allows developers to create new modules for JavaScript.
  • Node.js is a virtual machine, which makes JavaScript to get a high output as a scripting language.

Q27) What is the difference between Node.js and Ajax?

Answer: Although AJAX is a client-technology technology, Node.js is a server-side JavaScript environment.

Q28) Explain the word I / O in the context of Node.js.

Answer: I / O has input and output. It is used to access anything outside the application. Once the I / O application is rejected it will be loaded into machine memory to enable programs.

Q29) Node.js state that can be used.


  • Web applications
  • Network applications
  • Distributed systems
  • General purpose applications

Q30) What are two types of API functions in Node.js?

Answer: Disruptive, non-stop functioning and synchronization will prevent operations.

Q31) List the tools and IDEs used for Node.js.


  • The game
  • Nodeclipse Enide Studio
  • Jet Bartons West Star
  • JetBrains InteliJ Idea
  • MS Visual Studio
  • NoFLo

Q32) Explain the role of the request process in Node.js.

Answer: In Node.js, the request function is used to satisfy many requests from the server. If there is a large file that will take long for the server to perform, you can make a request to ensure that other requests to the server are uninterrupted.

Q33) What is a bug – first request?

Answer: Error-to-use invitations are mainly used to add errors and data. By default, the first argument always refers to a bug, and the user must check if there is anything wrong with it.

Q34) The difference between functional and programmer errors in the context of Node.js.

Answer: Functional errors are not real bugs. They are computer errors, such as “request time” or “hardware error”. Programming errors are the actual errors in the index.

Q35) What structure is commonly used in Node.js?

Answer: The most commonly used Node.js configuration is “Express”.

Q36) Event-driven programming definition.

Answer: This program is a programming example that is characterized by events by news programs of other programs.

Q37) What are two sections of event driven programming?

Answer: Event selection and event handling are two parts of event driven programming.

Q38) List some of the benefits of using Node.js.


  • Ability to develop strategic plans
  • Increased coordination
  • Incomparable skills

Q39) Explain the control flow function.

Answer: It is a common area code running simultaneously between multiple asynchronous function calls.

Q40) List the instructions in the Control Flow process.

Answer: Limit concurrency is the next program call to collect data to control the order of execution.

Q41) Can a user access the DOM?

Answer: No, you can not access the DOM.

Q42) How can I access the last expression in Node.js?

Answer: Underline the last expression (_) to use the character.

Q43) What is the biggest drawback of Node.js?

Answer: The biggest disadvantage is the fact that it is challenging to process a single thread to measure multiple core servers.

Q44) Explain REPL at Node.Js

Answer: REPL REAL REAL Print Loop It accepts, evaluates, and prints results. REPL provides the UNIX / Linux shell or a window console, which will include the command and the system, as a result we will respond to the output. REPL performs the following tasks.

Q45) What is the request on Node.Js?

Answer: We can call “callback” a coherent equivalent to a call. Node.js utilizes callbacks at large and stimulates the end of the given task. All APIs in Node.js are written to support callbacks.

Q46) What is a foot blade?

Answer: Initially, you can report a reputation after you know about it. Anger hell is very hard towers, which is hard to read and maintain.

Q47) How to Avoid Calling on Node.Js

Answer: Node.js uses a single threaded event indoors to activate the order processes. But if this approach is running longer than expected, it will prevent the whole process.

Q48) How many streams are there in Node.Js?


  • <Reader> – This is a stream that can be used for reading activity.
  • <Write> – It makes writing function easier.
  • <Duplex> – This stream can be used to read and write both.
  • <Transform> – This is a double stream format, which calculates the available input.
  • <data> – Removes this event when there are data available to read.
  • <end> – The stream burns this event when there is no more data to read.
  • <error> – This event gun when there is no error reading or writing data.
  • <Filler> – It will fill this event after clearing all the data on the base system.

Q49) Which of the below statement/s are true about Node.js?

  • Node is completely written in JavaScript
  • Node supports modular JavaScript

Answer: Only 2 is true

Q50) A node application developer is working on an application wherein he has to send a message back to the client from the server. Which among the below method can he use to implement the same?

Answer: write(“message”);

Q51) Consider a module index.js which is placed inside the mymodule folder. Consider another index.js  Which is placed outside the mymodule folder and given below is its content: var mymodule=require(‘./mymodule’);


What will be the output if the outside index.js is executed?

Answer: executes successfully

Q52)Consider the below code snippet:

 url = require(“url”);

function onRequest(request, response) { var query=___________________; var name=querystring.parse(query)[“un”]; response.writeHead(200, {“Content-Type”: “text/plain”}); response.write(“Hello “+name);}

Answer: parse(request.url).query

Q53) on (____, function(data){var data1=data; }); Fill the missing code from the options below to get the data from the client using post request.

Answer: data

Q54) Which of the below are built-in events in Node?

Answer: data, end

Q55) url = require(“url”);http.createServer(function(request, response) { var url_parts = _________; if(url_parts.pathname==”/login”)  write(“Login Page”);  response.end(); } Fill the missing code from the below options.

Answer: parse(request.url)

Q56) After successfully installed the Node.js on the developer system which of the below command   can be used to check the version of Node.

Answer: Node –v

Q57) Which of the following types of applications can be built in node.js?

Answer: Web application, RESTFUL Service, Chat application

Q58) State TRUE or FALSE – The callback function is a way of synchronous coding execution and get executed following a blocking I/O operation

Answer: FALSE

Q59) A node.js application is working in an application, wherein he has to send a response back to the client from the server. Which among the below methods can be used to implement the same?

Answer: end(“message”);

Q60) Consider a module test1.js which is placed inside my module folder. Consider another test2.js  file which is placed outside my module folder and given below is its content. What will be the output if the outside test2.js is executed

Var  mymodule = require(“./mymodule”); mymodule();

Answer: Throws exception

Q61) Consider the code snippet below: request.on(——, function(data) { var data1 = data;}); fill the missing code to get the data from the client using POST request.

Answer: data

Q62) Which of the following is true about EventEmiiter.on()?

Answer: The on() method is used to bind an event handler with the event.

Q63) STATE TRUE or FALSE – The ‘querystring’ module in node.js provides methods for parsing and formatting URL query strings.

Answer: TRUE

Q64) After successfully installed the Node.js on the system which of the below command can be used to update NPM version?

Answer: Npm install npm

Q65) Why node.js is a single threaded/multi-threaded?

Answer: js is a single-threaded for asynchronous processing. With the help of asynchronous processing on a single-thread under typical web loads, leads more the performance and the scalability can be achieved thread-based implementation.

Q66) Which one is not a method of EventEmiiter class in Node.js?

Answer: raw

Q67) Which of the following is true that the EventEmitter.emit() function in the Node.js?

Answer: emit() method is used to fire an event.

Q68) If the URL is http://localhost:7777/login?name=Chitra, the url pathname prints

Answer: Login

 Q69) Which of the most popular framework of Node for implementing routing?

Answer: Express

Q70) A node application developer is working on a project specification wherein she needs to read the content of a file while performing other operations. When function from the below will she select to perform the same?

Answer: readFile

Q71) What is the responsibility for the writeFile method in FS module?

Answer: It replaces the file if it already exists.

Q72) Guess the output of below code snippet?

var fs = require(‘fs’);

fs.readFIle(‘demo.txt”, “UTF8”, (err, content) => console.log(content); });

var data = fs.readFileSyce(“demo2.txt”); console.log(data.toString());

Answer: Data from demo2.text file data from demo1.txt file

Q73)Streams should be preferred in which of the following situations


  • File uploads in real time
  • To perform live streaming of video

Q74) John, a software developer wants to compress the file using node.js. Which of the following built-in modules he can use to achieve his requirement?

Answer: Zlib

Q75) Consider the code snippet

var  readStream = fs.createReadStream(“test.txt”);
var writeStream = fs.createWriteStream(“text2.txt”);
fill in the code to write the date to the destinations.
Answer: pipe(writeStream);

Q76) The statement is true regarding the TCP server?

Answer: TCP server can send data to the client

Q77) Which method is used to create a TCP server?

Answer: createServer()

Q78) Which built-in module can be used for socket programming?

Answer: Net

Q79) Which of the mode of installation is better to install any package which has an application dependency?

Answer: local

Q80) The correct statement regarding npm


  • Npm is the default package manager bundled with node.js
  • Open-source developers use npm to share and borrow packages
  • Packages are structured to keep track of dependencies and version in npm

Q81) A node application developer is working on a project requirement wherein he needs to have a node module to be available across the command line. Which among the command will he use to install the module?

Answer: npm install modulename – g

Q82) John wants to check the version of NPM. Which command line he can use to meet his requirement?

Answer: npm – v

Q83) Which of the following is a drop-in replacement of NPM?

Answer: Yarn

Q84) The package.json file can contain which of the following information?


  • Module name
  • License

Q85) Which of command is used to create the package.json file?

Answer: npm init

Q86) The “npm install” command installs the dependencies present in package.json file in the node_modules folder. Is state true or false?

Answer: Yes

Q87)Consider the code below written for connection the MYSQL database

var client = sql.createConnection({ host: “localhost”, user: “root” });


client.query(“use bookDB”);

which is true in above code?

Answer: Throws error if the DB does not exist

Q88) Select the object data modeling library for MongoDB used in node application?

Answer: Mongoose

Q89) A node application developer is working on a requirement wherein she needs to connect to another web application to execute a specific logic. Which among the will select to do the same?

Answer: Make a rest call to the other application using restler module

Q90) A node application developer is working on a project specification wherein she needs to save the data to the database using another application. Which among to do the same?

Answer: Make an HTTP post request to a restful web service.

Q91) A node application developer is working on a requirement wherein she needs to create a child process to execute a set of code in her application. Which will she make use to achieve the same?

Answer: exec()

Q92) A node application developer is working on an application, wherein she has to do load balancing between child processes. Which node module will she select to implement the same?

Answer: Cluster

Q93) ———- method the specialized form of spawn() method to create the child process?

Answer: fork()

Q94) Harry, a node application developer wants to run a python script from node.js. Is it possible for him to achieve his requirement using chid process module?

Answer: Yes

Q95) Which command is used to inert the breaking point in a node application?

Answer: debugger

Q96) Which is used to give a graphical user interface to perform node application debugging?

Answer: V8 inspector

Q97) Which is used to watch the changes occurring inside a given directory and restart the node application after each change?

Answer: Nodemon

 Q98) js asynchronous/ synchronous?

Answer: Asynchronous

Q99) Node js single threaded/multi-threaded?

Answer: Single-threaded

Q100) Is Node.js is front end/back end?

Answer: js is not front end or back end. It is a combination of the runtime environment and javascript library

Q101) Is it possible to evaluate expressing in Nodejs?

Answer: Yes, it is possible to evaluate the expression

Q102) What do you mean by local dependencies?

Answer: NPM installation can be any dependency in local. But local mode means the package of installation in a node_module folder. Here deployment is accessible by require();

Q103)what do you know about package.json?

Answer: It sits in the root directory of node application which is used to define properties.

Q104)List attribute of package.json?


  • Name
  • Version
  • Description
  • Author
  • Homepage
  • Repository
  • Main
  • Keywords
  • Contributors
  • Dependencies

Q105) Difference between Angularjs & nodejs ?


  • Angularjs – It’s a web application framework
  • NodeJs – It’s a runtime system.

Q106) What is Node.js?

Answer: Node.js is an amazing system created on Chrome’s V8 JavaScript motor that arranges the JavaScript straightforwardly into the local machine code. It is a lightweight structure utilized for making server-side web applications and stretches out JavaScript API to offer common server-side functionalities. It is commonly utilized for enormous scale application advancement, particularly for video spilling locales, single-page applications, and other web applications.

Q107) Why Node.js is single-strung?

Node.js utilizes a solitary strung model to help async preparing. With async handling, an application can perform better and is increasingly adaptable under web loads. Along these lines, Node.js utilizes a solitary strung model methodology instead of regular string-based usage.

Q108) What do you comprehend by Event-driven programming?

Answer: Occasion driven writing computer programs is a programming approach that vigorously utilizes occasions for activating different capacities. An occasion can be in any way similar to a mouse click, keypress, and so forth. At the point when an occasion happens, a get back to work is executed that is as of now enrolled with the component. This methodology basically pursues the distribution buy-in design. In view of occasion driven programming, Node.js is quicker when contrasted with different advances.

Q109) Rundown down the errands which ought to be done non concurrently utilizing the occasion circle?

Answer: The following is the rundown of the assignments which must be done nonconcurrently utilizing the occasion circle:
I/O activities
Overwhelming calculation
Anything requiring blocking

Q110) Rundown down the means utilizing which “Control Flow” controls the capacity brings in Node.js?

Answer: Control the request for execution
Gather information
Point of confinement simultaneousness
Call the following stage in the program

Q111) What do you comprehend by the Reactor Pattern in Node.js?

Answer: Reactor Pattern in Node.js is an idea of non-blocking I/O tasks. This example furnishes a handler that is related with every I/O activity and when an I/O demand is created, it is then submitted to a demultiplexer. This demultiplexer is a notice interface that is equipped for dealing with simultaneousness in non-blocking I/O mode. It additionally helps in gathering each solicitation as an occasion and afterward place every occasion in a line. In this way bringing about the age of the Event Queue. All the while, we have our occasion circle which emphasizes the occasions present in the Event Queue.

Q112) What are LTS arrivals of Node.js?

Answer: LTS stands Long Term Support adaptation of Node.js that gets all the basic bug fixes alongside security updates and execution enhancements. These adaptations are bolstered for in any event year and a half and fundamentally center around strength and security. The changes done to the LTS renditions are confined to the bug fixes, security overhaul, npm, and documentation refreshes, execution improvement, and so on.

Q113) Rundown down the significant security executions inside Node.js?

Answer: Significant security usage in Node.js are:
Mistake Handling

Q114) Clarify libuv.

Answer: Libuv is a multi-stage bolster library of Node.js which significantly is utilized for offbeat I/O. It was essentially produced for Node.js, with time it is prevalently drilled with different frameworks like Luvit, pyuv, Julia, and so forth. Libuv is a reflection around libev/IOCP relying upon the stage, giving clients an API dependent on libev. A couple of the significant highlights of libuv are:
Full-included occasion circle supported
Record framework occasions
Offbeat record and document framework activities
Offbeat TCP and UDP attachments
Youngster forms

Q115) Clarify the idea of middleware in Node.js?

Answer: When all is said in done, middleware is a capacity gets the Request and Response objects. At the end of the day, in an application’s solicitation reaction cycle these capacities approach different solicitation and reaction protests alongside the following capacity of the cycle. The following capacity of middleware is spoken to with the assistance of a variable, as a rule, named straightaway. Most generally performed undertakings by the middleware capacities are:
Execute any kind of code
Refresh or adjust the solicitation and the reaction objects
Finish the solicitation reaction cycle
Summon the following middleware in the stack

Q116) What do you comprehend by ESLint?

Answer: ESLint is an open-source venture at first created by Nicholas C. Zakas in 2013 which expects to give a linting utility to JavaScript through a fitting. Linters in Node.js are great apparatuses for looking through certain bug classes, particularly those which are identified with the variable extension.

Q117) For Node.js, why Google utilizes the V8 motor?

Answer: Google utilizes V8 as it is a Chrome runtime motor that changes over JavaScript code into local machine code. This, thus, accelerates the application execution and reaction process and gives you a quick running application.

Q118) Clarify the working of the control stream work.

Answer: In Node.js, the control stream work is essentially the code that is executed between the offbeat capacity calls. The following are the means that must be pursued for executing it:
Right off the bat, the request for execution must be controlled.
At that point, the necessary information should be gathered.
Next, the simultaneousness must be restricted.
When done, the following stage of the program must be summoned.

Q119) Rundown down the two contentions that async. Does the line take as much information?

Answer: The following are the two contentions that async. the line takes as info:
Assignment Function
Simultaneousness Value

Q120) What do you comprehend by worldwide items in Node.js?

Answer: In Node.js, Globals are the articles which are worldwide in nature and are accessible in every one of the modules of the application. You can utilize these articles legitimately in your application, instead of including them expressly. The worldwide items can be modules, capacities, strings, objects, and so on. In addition, a portion of these items can be in the module scope rather than a worldwide degree.

Q121) Clarify the idea of stub in Node.js.

Answer: In Node.js, stubs are essentially the projects or capacities that are utilized for animating the module or segment conduct. During any experiments, stubs give the canned answers of the capacities.

Q122) Characterize the idea of the test pyramid. Disclose the procedure to execute them regarding HTTP APIs.

Answer: The test pyramid is an idea that is created by Mike Cohn. As indicated by this, you ought to have a higher number of low-level unit tests when contrasted with significant level start to finish tests that going through a GUI.
Regarding HTTP APIs it might be characterized as:
A higher number of low-level unit tests for each model
Lesser mix tests to test model communications
Lesser acknowledgment tests for testing genuine HTTP endpoints

Q123) Clarify the reason for the ExpressJS bundle?

Answer: Express.js is a system based over Node.js that encourages the administration of the progression of information among server and courses in the server-side applications. It is a lightweight and adaptable system that gives a wide scope of highlights required for the web just as portable application advancement. Express.js is created on the middleware module of Node.js called interface. The associate module further utilizes the Http module to speak with Node.js. Accordingly, in the event that you are working with any of the interface based middleware modules, at that point you can without much of a stretch coordinate with Express.js.

Q124) Separate between the process.nextTick() and setImmediate()?

Answer: In Node.js, process.nextTick() and setImmediate(), both are elements of the Timers module which help in executing the code after a predefined period. Be that as it may, these capacities contrast in their execution. The process.nextTick work sits tight for the execution of activity till the following go around in the occasion circle or once the occasion circle is finished at exactly that point it will conjure the callback work. Then again, setImmediate() is utilized to execute a callback technique on the following cycle of the occasion circle which in the long run returns it to the occasion circle to execute the I/O activities.

Q125) Clarify the use of a cradle class in Node.js?

Answer: Cradle class in Node.js is utilized for comparably putting away the crude information as a variety of whole numbers. However, it compares to a crude memory portion that is situated outside the V8 stack. It is a worldwide class that is effectively available can be gotten to in an application without bringing in a cradle module. Cushion class is utilized in light of the fact that unadulterated JavaScript isn’t perfect with paired information. In this way, when managing TCP streams or the record framework, it’s important to deal with octet streams.

Q126) How does Node.js handle the youngster strings?

Answer: By and large, Node.js is a solitary strung procedure and doesn’t uncover the youngster strings or string the executive’s strategies. Be that as it may, you can, in any case, utilize the kid strings utilizing bring forth() for some particular nonconcurrent I/O errands that execute out of sight and don’t typically execute any JS code or block the headliner circle in the application. On the off chance that regardless you need to utilize the stringing idea in your application, you need to incorporate a module called ChildProcess unequivocally.

Q127) Clarify stream in Node.js alongside its different kinds.

Answer: Streams in Node.js are the assortment of information like clusters and strings. They are objects utilizing which you can peruse information from a source or compose information to a goal in a nonstop way. It probably won’t be accessible without a moment’s delay and need not to have fit in the memory. These streams are particularly valuable for perusing and preparing an enormous arrangement of information. In Node.js, there are four key kinds of streams:
Coherent: Used for perusing huge lumps of information from the source.
Writeable: Use for composing huge pieces of information to the goal.
Duplex: Used for both the capacities; peruse and compose.
Change: It is a duplex stream that is utilized for adjusting the information.

Q128) Clarify affixing in Node.js.

Answer: Affixing is a component whereby the yield of one stream is associated with another stream making a chain of numerous stream operationsExplain fastening in Node.js.
Tying is an instrument whereby the yield of one stream is associated with another stream making a chain of various stream activities.

Q129) Clarify the event Loop in Node Js?

Answer: In Node Js forms are single-strung, to bolsters simultaneousness, it utilizes occasions and callbacks. An occasion circle is a system that permits Node.js to perform non-blocking I/O tasks.

Q130) What is the utilization of a cradle class in Node.js?

Answer: The Node.js gives Buffer class to store crude information like a variety of whole numbers yet relates to a crude memory assignment outside the V8 load. It is a worldwide class and can be gotten to in an application without bringing in a support module. Cradle class is utilized in light of the fact that unadulterated JavaScript isn’t good with double information. Along these lines, when managing TCP streams or the record framework, it’s important to deal with octet streams.