Top 50 Node.Js Interview Questions with Answers

Node.Js Interview Questions with Answers

1. What is Node.js?

a. A programming language
b. A web server
c. A runtime environment for JavaScript
d. A database management system

Answer: c

2. Which event loop does Node.js use?

a. Non-blocking
b. Blocking
c. Sequential
d. Parallel

Answer: a

3. What is the purpose of the Node.js modules?

a. To create reusable code
b. To import JavaScript libraries
c. To add new features to Node.js
d. To improve Node.js performance

Answer: a

4. What is callback hell?

a. When a function calls itself recursively
b. When too many callbacks are nested within one another
c. When a callback function returns an error
d. When a callback function takes too long to execute

Answer: b

5. What is the purpose of the Node.js package.json file?

a. To store metadata about the project
b. To store the project’s source code
c. To store the project’s dependencies
d. To store the project’s configuration settings

Answer: c

6. What is NPM?

a. Node Package Manager
b. Node Programming Module
c. Node Project Manager
d. Node Package Module

Answer: a

7. How can you install a Node.js module using NPM?

a. npm install module-name
b. node install module-name
c. module-name install npm
d. install npm module-name

Answer: a

8. What is a buffer in Node.js?

a. A temporary storage area for data
b. A data type used to represent binary data
c. A function used to read and write files
d. An object used to create streams

Answer: b

9. What is middleware in Node.js?

a. A function that is executed before processing a request
b. A function that is executed after processing a request
c. A function that is executed between two other functions
d. A function that is executed when an error occurs

Answer: c

10. What is the purpose of the Node.js http module?

a. To handle HTTP requests and responses
b. To create and manage web servers
c. To send emails
d. To connect to a database

Answer: a

11. Which HTTP method is used to update a resource?

a. GET
b. POST
c. PUT
d. DELETE

Answer: c

12. What is the difference between res.send() and res.end() methods in Node.js?

a. res.send() sends JSON data, while res.end() sends plain text
b. res.send() sends plain text, while res.end() sends JSON data
c. res.send() terminates the response, while res.end() does not
d. res.send() and res.end() are interchangeable

Answer: a

13. What is an EventEmitter in Node.js?

a. A function that listens for events
b. An object that emits events
c. A method that triggers an event
d. A module that handles events

Answer: b

14. What is the purpose of the fs module in Node.js?

a. To handle file system operations
b. To create and manage web servers
c. To send emails
d. To connect to a database

Answer: a

15. What is a route in Node.js?

a. A path to a file
b. A URL endpoint
c. A function that handles a specific HTTP request
d. A function that handles a specific HTTP response

Answer: b

16. What is Express.js?

a. A library for building web applications in Node.js
b. A Node.js module for handling HTTP requests and responses
c. An object-oriented programming language
d. A database management system

Answer: a

17. What is Mongoose?

a. A Node.js module for working with MongoDB
b. A Node.js module for working with MySQL
c. A web server framework for Node.js
d. A front-end framework for Node.js

Answer: a

18. What is the difference between MongoDB and MySQL?

a. MongoDB is a document-oriented database, while MySQL is a relational database
b. MongoDB is open source, while MySQL is not
c. MongoDB is faster than MySQL
d. MySQL is more scalable than MongoDB

Answer: a

19. What is the purpose of the cluster module in Node.js?

a. To create multiple child processes of a Node.js application
b. To create a cluster of web servers
c. To manage user sessions
d. To handle database connections

Answer: a

20. What is the purpose of the bcrypt module in Node.js?

a. To create and manage web servers
b. To encrypt and decrypt data
c. To handle file system operations
d. To connect to a database

Answer: b

21. What is the purpose of the Node.js net module?

a. To handle HTTP requests and responses
b. To handle TCP connections
c. To send emails
d. To connect to a database

Answer: b

22. What is the purpose of the forever module in Node.js?

a. To create and manage web servers
b. To continuously run a Node.js application
c. To handle file system operations
d. To connect to a database

Answer: b

23. What is the purpose of the Node.js child_process module?

a. To handle file system operations
b. To create and manage child processes
c. To handle HTTP requests and responses
d. To manage user sessions

Answer: b

24. What is a stream in Node.js?

a. A data type used to represent binary data
b. A buffer that is read or written to sequentially
c. A function that processes data asynchronously
d. An object that is used to create streams

Answer: b

25. What is the purpose of the Node.js util module?

a. To handle file system operations
b. To create and manage web servers
c. To provide utility functions
d. To connect to a database

Answer: c

26. What is a Readable stream in Node.js?

a. A stream that can only be read from
b. A stream that can only be written to
c. A stream that can be both read from and written to
d. A stream that is used to read and write files

Answer: a

27. What is a Writable stream in Node.js?

a. A stream that can only be read from
b. A stream that can only be written to
c. A stream that can be both read from and written to
d. A stream that is used to read and write files

Answer: b

28. What is the purpose of the os module in Node.js?

a. To handle file system operations
b. To create and manage web servers
c. To interact with the operating system
d. To connect to a database

Answer: c

29. What is the purpose of the http-proxy module in Node.js?

a. To handle HTTP requests and responses
b. To create and manage web servers
c. To proxy HTTP requests to other servers
d. To connect to a database

Answer: c

30. What is the purpose of the Node.js crypto module?

a. To handle file system operations
b. To create and manage web servers
c. To encrypt and decrypt data
d. To connect to a database

Answer: c

31. What is the purpose of the Node.js path module?

a. To provide utility functions for working with file paths
b. To create and manage web servers
c. To handle HTTP requests and responses
d. To connect to a database

Answer: a

32. What is the purpose of the Node.js url module?

a. To create and manage web servers
b. To handle HTTP requests and responses
c. To parse and format URLs
d. To connect to a database

Answer: c

33. What is the purpose of the Node.js zlib module?

a. To handle file system operations
b. To create and manage web servers
c. To compress and decompress data
d. To connect to a database

Answer: c

34. What is the purpose of the Node.js cluster module?

a. To create and manage child processes of a Node.js application
b. To create a cluster of web servers
c. To handle database connections
d. To handle user authentication and authorization

Answer: a

35. What is a Promise in Node.js?

a. A function that is executed before processing a request
b. An object that represents the eventual completion of an asynchronous operation
c. A method that triggers an event
d. A method that handles rejected Promises

Answer: b

36. What is the purpose of the Node.js assert module?

a. To handle HTTP requests and responses
b. To create and manage web servers
c. To write unit tests for Node.js applications
d. To connect to a database

Answer: c

37. What is the purpose of the Node.js debug module?

a. To create and manage web servers
b. To handle database connections
c. To improve the debugging capabilities of Node.js
d. To handle file system operations

Answer: c

38. What is the purpose of the Node.js dgram module?

a. To handle HTTP requests and responses
b. To handle datagram sockets
c. To create and manage web servers
d. To connect to a database

Answer: b

39. What is the purpose of the Node.js punycode module?

a. To encode and decode domain names
b. To create and manage web servers
c. To handle file system operations
d. To connect to a database

Answer: a

40. What is the purpose of the Node.js q module?

a. To create and manage web servers
b. To provide a simple and powerful promise-based API
c. To handle file system operations
d. To connect to a database

Answer: b

41. What is the purpose of the Node.js request module?

a. To handle HTTP requests and responses
b. To create and manage web servers
c. To handle file system operations
d. To connect to a database

Answer: a

42. What is the purpose of the Node.js sinon module?

a. To create and manage web servers
b. To improve the testing capabilities of Node.js
c. To handle file system operations
d. To connect to a database

Answer: b

43. What is a duplex stream in Node.js?

a. A stream that can only be read from
b. A stream that can only be written to
c. A stream that can be both read from and written to
d. A stream that is used to read and write files

Answer: c

44. What is the purpose of the Node.js tty module?

a. To handle HTTP requests and responses
b. To create and manage web servers
c. To interact with the terminal
d. To connect to a database

Answer: c

45. What is the purpose of the Node.js zlib-sync module?

a. To handle file system operations
b. To compress and decompress data synchronously
c. To handle HTTP requests and responses
d. To connect to a database

Answer: b

46. What is the purpose of the Node.js async module?

a. To provide a simple and powerful promise-based API
b. To handle file system operations
c. To create and manage web servers
d. To provide utility functions for working with asynchronous code

Answer: d

47. What is the purpose of the Node.js strong-agent module?

a. To create and manage web servers
b. To improve the performance of Node.js applications
c. To handle file system operations
d. To connect to a database

Answer: b

48. What is the purpose of the Node.js chokidar module?

a. To watch files and directories for changes
b. To create and manage web servers
c. To handle HTTP requests and responses
d. To connect to a database

Answer: a

49. What is the purpose of the Node.js fs-extra module?

a. To handle file system operations
b. To create and manage web servers
c. To handle HTTP requests and responses
d. To connect to a database

Answer: a

50. What is the purpose of the Node.js clusterize module?

a. To create and manage child processes of a Node.js application
b. To improve the scalability of a Node.js application
c. To handle database connections
d. To handle user authentication and authorization

Answer: b

How to become a Node.js Developer?

Introduction

Node.js could be a platform designed on Chrome’s JavaScript runtime for simply building quick and scalable network applications. Node.js uses an event-driven, non-blocking I/O model that creates it light-weight and efficient, excellent for data-intensive time period applications that run across distributed devices.
Node.js is an open-source, cross-platform runtime setting for developing server-side and networking applications. Node.js applications are written in JavaScript and maybe run among the Node.js runtime on OS X, Microsoft Windows, and Linux.

Node.js additionally provides an expensive library of assorted JavaScript modules that simplifies the event of internet applications victimization Node.js to a good extent.


What is Node.js?

Node. js could be a platform designed on Chrome’s JavaScript runtime for simply building quick and scalable network applications. Node. js uses an event-driven, non-blocking I/O model that creates it light-weight and efficient, excellent for data-intensive time period applications that run across distributed devices.

How does Node.js work?

First of all just like other languages node comes with packages and modules. These are libraries of functions that we can import from npm (node package manager) into our code and utilize. Node. js is that the JavaScript runtime surroundings that’s supported Google’s V8 Engine for example with the assistance of Node. js we are able to run the JavaScript outside of the browser js is that it’s single-threaded, supported event-driven design, and non-blocking supported the I/O model.

Why is node js so popular?

Node. js will handle several concurrent requests. this is often the most reason it quickly became popular among developers and huge corporations. It will handle several simultaneous requests while not straining the server.

Role of a Node.js developer:

A Node. js developer is answerable for writing server-side internet application logic in JavaScript and/or variants of it, like CoffeeScript, IcedCoffeeScript, etc, js developer is answerable for writing server-side internet application logic in JavaScript and/or variants of it, like CoffeeScript, IcedCoffeeScript, etc.

Node.js Developer duties:

  • Work as part of a team developing applications and services using Agile development methods.
  • Contribute to team and organizational improvements in process and infrastructure.
  • Build customer-facing UI and back-end services for payment processing administration and management.
  • Code, test, and operate a node. js-based services.
  • Effectively use tools and ingenuity to identify and fix defects before they become a problem.

Responsibilities of Node.js Developers:

Features of Node.js:
Following are some of the important features that make Node.js the first choice of software architects.

Asynchronous and Event-Driven − All Apis of the Node.js library are asynchronous, that is, non-blocking. It primarily means that a Node. the js-based server never waits for an API to come back with the information. The server moves to the next API when calling it and a notification mechanism of Events of Node.js helps the server to induce a response from the previous API decision.

Very Fast − Being built on Google Chrome’s V8 JavaScript Engine, the Node.js library is very fast in code execution.

Single-Threaded but Highly Scalable − Node.js uses a single-threaded model with event looping. The event mechanism helps the server to reply in a non-blocking way and makes the server extremely scalable as against ancient servers that produce restricted threads to handle requests. Node.js uses a single-threaded program and therefore the same program will offer service to a far larger range of requests than ancient servers like Apache HTTP Server.

No Buffering − Node.js applications never buffer any data. These applications simply output the data in chunks.

License − Node.js is released under the MIT license.

The Benefits of Node.js:

  • Better efficiency and overall developer productivity
  • Code sharing and reuse
  • Speed and performance
  • Easy knowledge sharing within a team
  • A huge number of free tools

What is the scope of node JS?

Node.js could be a runtime environment that permits you to write down server-side applications in JavaScript. PHP could be a server-side language. attributable to that, you’ll get to try PHP with a frontend language, sometimes a mix of HTML, CSS, and JavaScript, to make full-stack internet apps.

Node.js Developer Course:

Js Developer Course covers the basics of Node before diving deep into nice tools like specific, Mongoose, and MongoDB. the whole course is predicated around one goal: Turning you into an expert Node developer capable of developing, testing, and deploying real-world production applications.

Node.js Developer requirements and qualifications:

  • Previous working experience as a Node.js Developer for (x) years.
  • BA in computer science or similar relevant field.
  • In-depth knowledge of Node.js.
  • Hands-on experience with HTML, CSS, and AJAX.
  • Development experience designing object-oriented JavaScript and SVG.
  • Applicable knowledge of web libraries and frameworks such as AngularJS, Polymer, and Closure.
  • Familiarity with the whole web stack, including protocols and web server optimization techniques.
  • Strong analytical skills and problem-solving aptitude.
  • Attention to detail.

Conclusion

Node.js is, while not a doubt, one of all the additional interesting technologies in use nowadays, and it’s full-grown into one of all the foremost popular platforms used for internet applications, services, and desktop apps. It’s my hope that when looking at this course, you currently have a solid foundation to begin writing your own Node applications.

If you wanna learn, and from all of us here at DevOpsSchool, thank you for watching!

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Top programming languages in the world & their courses and certifications?

The world is turning into smarter day by day with the quick development of Automation, computing, Blockchain, etc. And at the middle of it, somewhere, are programming languages. In fact, Labour Statistics have expected a 21% growth for programming jobs within the returning decade, which is quite 4x the common for all occupations. however attempting to start out out with programming is a frightening escapade, particularly for professionals with no previous expertise. thus if you’re one who cannot decide wherever to start, don’t worry as a result of we’ve got you coated. the following article aims to grant you a fast examine the highest Programming Languages within the world & their courses and certifications?

Java

Owned by the Oracle Corporation, Java is one of the oldest, most typical, in-demand programming languages in use these days. Well, think about a number of your favorite internet apps and games. It’s extremely probably that Java plays an enormous role within the code that creates their work. Another necessary factor that has kept Java’s magic intact among internet development corporations is its independence from platforms. This helps developers to basically “write once, work anywhere”(WORA). Java is everyplace and also the demand for sturdy developers is virtually high.

How does it work?

In Java, programs don’t seem to be compiled into practicable files; they’re compiled into bytecode (as mentioned earlier), that the JVM (Java Virtual Machine) then executes at runtime. Java source code is compiled into bytecode after we use the javac compiler. The bytecode gets saved on the disk with the file extension.

Reasons for Demand:

  • With its presence in almost 3 billion devices, Java’s new frameworks such as Spring, Struts, and Hibernate have also become very popular.
  • It is favored by enterprises, with roughly 90 percent of Fortune 500 companies use Java for building applications and back-end systems.
  • Java is highly recognized for its scalability and portability across multiple platforms from mainframe data centers to smartphones.
  • With millions of users across the globe, the popular users of Java include Barclays, HCL, Capital One, etc.
  • Forms the base for and is used in a multitude of domains including mobile application, web development, system programming, and big data.
  • Its powerful features include strong memory management, high performance, backward compatible and top-notch security.

Golang

Developed by the technical school big Google itself, Go is one of the newest players within the programming platform. it’s an open-source language that produces it simple to form easy, secure, and productive computer code. It combines the most effective aspects of useful and object-oriented programming, also as options a valuable set of intrinsical development tools.

How does it work?

Go was originally designed for programs associated with networking and infrastructure. it absolutely was meant to switch widespread high-performance server-side languages like Java and C++. Today, Go is used for a spread of applications like cloud and server-side applications, DevOps, command-line tools, and far additional.

Reasons for Demand:

  • Popular projects like Kubernetes, Docker, Hugo, Hyperledger Blockchain, and Ethereum are developed using Golang.
  • The language is straightforward to grasp even for the new programmers while being extremely powerful at the same time.
  • Supports multithreading at large and is hence used by a lot of companies that rely heavily on distributed systems.
  • Go has been optimized by Google to be incredibly efficient with memory and has blazing fast speed.
  • It provides high performance like C/C++ and has efficient concurrency handling like Java.
  • It is widely used in startups and some of the companies that use the language are Walmart, Springboard, Siemens, Dell.

TypeScript

TypeScript might be a superset of the JavaScript language that has a single open-source compiler and is developed within the main by one trafficker (Microsoft.) The goal of the matter is to help catch mistakes early through a sorting system and to make JavaScript development further economical.

How does it work?

TypeScript works by adding increased syntax to JavaScript so transforming it to JavaScript when the typescript compiler will its own checks. It does not modification JavaScript’s kind of system. Instead, it adds a lot of checks to it.

Reasons for Demand:

  • TypeScript simplifies JavaScript code, making it easier to read and debug.
  • TypeScript gives us all the benefits of ES6 (ECMAScript 6), plus more productivity.
  • TypeScript can help us to avoid painful bugs that developers commonly run into when writing JavaScript by type checking the code.
  • TypeScript is a modern programming language loved by engineers for making web development a lot easier.
  • You can use TypeScript everywhere instead of JavaScript, as it compiles to regular JS code. That’s another reason for its demand.

Scala

Scala could be a programming language used for practical programming and powerful static systems. It’s object-oriented and runs on JVM. It’s the aptitude to interoperate with existing Java code and libraries. It’s powerfully thought of to be a static kind of language and doesn’t have an idea of primitive information.

How does it work?

The compiler in Scala works during a similar fashion because of the Java compiler. It gets the source code and generates Java byte-code which will be dead severally on any commonplace JVM (Java Virtual Machine). Scala could be a statically typed language. Scala will execute Java.

Reasons for Demand:

  • Scala programming language variables are immutable and can be easily overloaded in Java. In addition to this, it also offers to adopt new languages like Python, Ruby, etc. to implement functional programming.
  • Scala is a language that is inherently more expressive than Java. The developers who learn Scala after Java find it easier and interesting to write code in Scala. To get the beauty of this language in comparison with Java.
  • A developer needs to be in demand always. The main reason or use of Scala is a better growth and job. Learning Scala will increase your demand and will make you even more marketable. Many companies like Twitter, LinkedIn, Foursquare, etc are using Scala.
  • Scala can be said as a language that is growing fast and lots of programmers going to join the Scala bandwagon. Even developers who know Java are now moving to learn Scala. There are many new libraries and frameworks that are being built on application of Scala.
  • A Java programming finds it difficult to learn any functional language. uses of Scala is easy due to its object-oriented functionality. Scala has clean syntax, nice libraries, good online documentation, and lots of people in the industry using it.

JavaScript

Along with HTML and CSS, Javascript is that the programming language that engineered the internet. So, it’s a fairly huge deal. Universally referred to as the language of internet developers, javascript could be a feature-rich object-based scripting language that includes asynchronous event handling and crisp syntax, it’s found widespread use within the field of internet development. What started off as an easy client-side scripting language, is currently a highlight inside the net development community that includes multiple frameworks for each backend and frontend development.

How does it work?

JavaScript is what’s known as a Client-side Scripting Language. within a standard website, you place some JavaScript code See however sites Work for details on sites. once the browser loads the page, the browser features a constitutional interpreter that reads the JavaScript code it finds on the page and runs it.

Reasons for Demand:

  • In extension to absolute JavaScript, various popular libraries and frameworks make JavaScript development easier.
  • Most accessible supporting technologies related to JavaScript are JSON, jQuery, Angular, React (JS Library), etc.
  • Fundamentally a front-end language, it can also be practiced on the server-side throughout Node.js to create scalable network applications.
  • Majority of tech giants like Google, Facebook, SAP, Dell, Accenture, etc rely on Javascript to design interactive web pages and dynamically display content to users.

PHP

PHP is used by 79% of all the websites whose server-side programming language we all know. it’s the main used for developing dynamic and data-heavy websites and applications. it’s been the cornerstone of the net for a protracted time. PHP could be an easy, fast, and platform-independent general programming language with over 631,000 repositories on GitHub.

How does it work?

The PHP software system works with the webserver, which is that the software system that delivers sites to the planet. after you A URL into your net browser’s address bar, you are causation a message to the webserver at that URL, asking it to send you an HTML file. Your browser reads the HTML file and displays the online page.

Reasons for Demand:

  • PHP is used by 79.0% of all the websites whose server-side programming languages are known.
  • PHP is simple, fast and platform-independent.
  • It is 631k repositories on GitHub and has a community of 5.9M to back it up.
  • Companies that have publicly declared usage of PHP include Facebook, Yahoo, Wikipedia.

AngularJs

AngularJS could be a client-side JavaScript MVC framework to develop a dynamic internet application. It extends the flexibility of HTML by adding intrinsical attributes and parts and additionally provides a capability to form custom attributes victimization easy JavaScript.

How does it work?

AngularJS could also be a structural framework for dynamic net apps. It permits you to use hypertext markup language as your model language and permits you to extends HTML syntax to specify your application’s elements clearly and compactly. AngularJS’s information binding and dependency injection eliminate a lot of the code you’d otherwise need to write.

Reasons for Demand:

  • Modularity is one of the prime reasons why AngularJS is popular among web developers.
  • AngularJS recognizes the need to create an additional module so that it can be combined with other developed application modules.
  • It allows and enables web developers to create multiple modules for a single web application.
  • AngularJS is one of the skills unique to this job, along with React. js, Code. js, Javascript, and CSS.
  • Today, AngularJS is a leading framework for building dynamic, single-page web applications (known as SPAs), including ones like PayPal and Netflix.

NodeJs

Node. js is primarily used for non-blocking, event-driven servers, because of its single-threaded nature. It’s used for ancient websites and back-end API services time period was designed with the period of time, push-based architectures in mind.

How does it work?

Node. js is the JavaScript runtime environment which is based on Google’s V8 Engine with the help of Node, Js we can run the JavaScript outside of the browser, js is that it is single-threaded, based on event-driven architecture, and non-blocking based on the I/O model.

Reasons for Demand:

  • A Single Language for All Layers. Another key benefit of Node.
  • It can be Hosted Anywhere.
  • It’s lightning Fast. Node.
  • It is JavaScript Everywhere. One of the biggest reasons why Node.
  • It is Lightweight. Typically, Node.
  • High Performance.
  • It is Easy to Modify and Maintain.

Conclusion

In this article, we have listed the top most popular programming languages to learn. Now, it’s your choice where you want to land your career or choose the right programming language for you, If you wanna learn then i would suggest you check out DevOpsSchool it is a great platform for learning. Get an insight to all the details we mentioned, and choose accordingly. So, make sure you should hold a good command on a specific language you choose for programming.You’ll even also join our Online and Classroom Programs.
And that concludes my list of the Top Programming Languages. Hope this article proved useful to you.

Thank you!

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error in ./resources/assets/sass/app.scss

If you are getting this error (error in ./resources/assets/sass/app.scss) in Node module please follow some steps which is have mentioned in the following

Error:-

Many of you get this error when you did not change anything in app.scss, but when I run npm run watch I get the following errors:

 error  in ./resources/sass/app.scss                                                                      

Module build failed (from ./node_modules/sass-loader/lib/loader.js):                                      
Unsupported operation: Cannot extract a file path from a URI with a fragment component                    

@ ./resources/sass/app.scss 2:14-254                                                                     

    Asset      Size   Chunks             Chunk Names                                                     
/js/app.js  2.46 MiB  /js/app  [emitted]  /js/app                                                         

ERROR in ./resources/sass/app.scss                                                                        
Module build failed (from ./node_modules/css-loader/index.js):                                            
ModuleBuildError: Module build failed (from ./node_modules/sass-loader/lib/loader.js):                    

undefined                                                                                                 
      ^                                                                                                  
      Join(null, "variables"): part 0 was null, but part 1 was not.                                       
@import 'variables';                                                                                      
        ^^^^^^^^^^^                                                                                       
  stdin 2:9  root stylesheet                                                                              
      in C:\Users\TAQI VAHEED\Desktop\#Coding\resPro\resources\sass\app.scss (line 2, column 9)           
    at runLoaders (C:\Users\TAQI VAHEED\Desktop\#Coding\resPro\node_modules\webpack\lib\NormalModule.js:30
    at C:\Users\TAQI VAHEED\Desktop\#Coding\resPro\node_modules\loader-runner\lib\LoaderRunner.js:364:11  
    at C:\Users\TAQI VAHEED\Desktop\#Coding\resPro\node_modules\loader-runner\lib\LoaderRunner.js:230:18  
    at context.callback (C:\Users\TAQI VAHEED\Desktop\#Coding\resPro\node_modules\loader-runner\lib\Loader
13)

Solution:-

The main issue which we have found that is related to dart-sass being used instead of node-sass with laravel

You have to just follow one step:-

Step 1:- You have to run this Command and all the things will solve .

npm install node-sass

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