42 Node js Interview Questions and Answers

By admin
Nisan 13, 2023

A single thread from the Thread Pool is assigned to a single complex request. This thread is responsible for completing a particular blocking request by accessing external resources, such as computation, database, file system, etc. Additionally, adhering to standard interview etiquette when conducting Node.js interviews is essential.

  • Ajax is a client-side technology that allows for asynchronous communication between the client and the server.
  • Libuv is a critical component of Node.js, and it’s what makes it possible to handle I/O operations in a non-blocking and efficient manner.
  • However, it is important to note that clustering does not guarantee a linear increase in performance.
  • A module can be seen as a container for a specific feature or domain of the application.
  • This means that setImmediate() has a higher priority than setTimeout().

The package.json file is located in the root directory of an application and it is used by the npm package manager to install and manage the dependencies of an application. Front-end developers focus on the client side of the application, while back-end developers focus on the server side of the application. Both roles are important for building a successful web application and require different skill sets and expertise. Global objects in Node.js are objects that are available in all modules without the need for an explicit require statement.

Node.js interview questions about skills

DNS stands for Domain Name System, and it is responsible for translating domain names into IP addresses. Lookup() method is used to perform a DNS lookup and resolve a domain name into an IP address. Clustering can be used to improve the performance of HTTP servers, database connections, and other I/O operations. However, it is important to note that clustering does not guarantee a linear increase in performance. Express is a great choice for building web applications in Node.js, and its popularity and active community make it a safe and reliable choice for developers of all levels. One of the most important security features in Node.js is the ability to run code in a restricted environment.

The purpose of using a callback function is to handle asynchronous operations. Modularization in Node.js provides scalability when developing complex applications. The modularization option can be used to execute the import of objects, classes, functions, modules, and external files. One of the main applications where Node.js can be used is building real-time web applications.

Node.js Interview Questions

On the other hand, the setImmediate() method schedules code execution to occur immediately after the current event loop iteration completes. This means that setImmediate() has a higher priority than setTimeout(). The crypto module is widely used in Node.js applications to generate secure random numbers, create digital signatures, and verify signatures. It also provides support for various encryption algorithms such as AES, DES, and RSA.

Node.js Developer interview questions

But it corresponds to a raw memory allocation that is located outside the V8 heap. It is a global class that is easily accessible can be accessed in an application without importing a buffer module. So, when dealing with TCP streams or the file system, it’s necessary to handle octet streams. Node.js is an extremely powerful framework developed on Chrome’s V8 JavaScript engine that compiles the JavaScript directly into the native machine code. It is a lightweight framework used for creating server-side web applications and extends JavaScript API to offer usual server-side functionalities. It is generally used for large-scale application development, especially for video streaming sites, single page application, and other web applications.

Could you name some libraries that developers frequently use with Node.js?

A backend Javascript / Node.js developer would be responsible for the server-side of web applications. They must be able to work with databases, APIs, and web servers. They need to be able to troubleshoot errors and performance issues. A backend developer should also be able to optimize code for speed and scalability.

Node.js Developer interview questions

However, it’s important to carefully consider when and where to implement caching, as it can also introduce complexity and potential tradeoffs. In summary, the choice between PostgreSQL and MongoDB largely depends on the specific needs of your Node.js project. If you need a database that can handle large amounts of unstructured data and prioritize scalability, MongoDB might be a better choice.

Node.js Interview Questions and Answers For Experienced Professionals

It allows you to handle incoming HTTP requests and send HTTP responses, as well as control the server’s behavior, such as listening on a specific port and setting various options. Module.exports is a Node.js module that allows you to export objects, functions, and variables from your code. You can use it to create modules that can be imported and used in other Node.js programs.

David is experienced with many web frameworks and environments, but he particularly enjoys developing with Meteor.js. He appreciates the importance of quality code as well as the need to meet scheduling demands. Jamie is a front‑end developer focused on crafting clean and beautiful experiences. Her fever for color coordination and meticulous notebooks are indicative of her programming style and attention to detail. Much of her focus is on collaboration, efficiency, and learning. Jamie is a perfectionist to the smallest pixel and has a passion for building custom WordPress themes and React applications.

Q23: What is a blocking code? ☆☆☆

Describe the projects you have and how the contribution of the Node.js developer will help your organization. Explain whether you have development projects, maintenance projects, or both. Talk about your larger team, and give examples of the innovations you pursue. Chanining is a mechanism to connect output of one stream to another stream and create a chain of multiple stream operations.

Node.js Developer interview questions

This process can return a response only after the file is pushed into the buffer completely, moreover, the process must read the file fully. Callback function gets called whenever corresponding event triggered. Node.js also provides https://wizardsdev.com/en/vacancy/middle-nodejs-developer-3/ a rich library of various javascript modules which eases the developement of web application using Node.js to great extents. Package.json is a file that is used to store the metadata of all the contents of the project.

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