Node js Interview Prep: Questions + Answers With Code Examples

With the rise of modular programming paradigms, candidates should be well-versed in both CommonJS and ES Modules, highlighting the differences and scenarios for each. Surveys reveal that nearly 60% of codebases are transitioning to ES Modules, indicating a clear industry trend. The interviewer may ask you a question to gauge your salary expectations. When answering this question, you can suggest a range based on the industry standards you identified or express your flexibility. Ultimately, having skills in continuous integration helps improve the quality of your software and the efficiency of releasing updates. In your interview, it’s important to highlight your coding experience with continuous integration and how you’ve worked to make your software error-free and functional.

Explain the Event Loop.

Streams are used for processing data that is read or written a block at a time. It is especially important for working with big files or streaming data through a network while being very frugal with memory. Package.json is file in Node.js where Full stack developer skills the project name and version, dependencies, or scripts can be located. It becomes relevant in terms of the configuration of the project and the development environments of the project too. Concurrency in Node is done using callbacks, Promises, or async/await in Node.js.

#16. What are the differences between process.nextTick() and setImmediate()?

These methods align with CRUD (Create, Read, Update, Delete) operations, which are JavaScript Full-stack developer (Node.jsReact.js) job used to manipulate resources over the web. In NodeJS url module is used to split the URL of the website into parts so that it becomes readable and can be used in the different parts of the application. The parse() method is used with the url module to separate the URL of the website into parts. Less likely to block the event loop, as it schedules the callback in the next iteration. Can cause a stack overflow if used excessively, as it keeps the event loop busy without yielding.

• It allows other code to be run in the meantime and prevents any blocking.
• Threads share the same memory space and resources as the main process, allowing  more efficient use of CPU cores and better responsiveness in applications.
• Node.js is an open-source, cross-platform JavaScript runtime environment and library to run web applications outside the client’s browser.
• Your application can be tested by running the below-given command in your terminal.
• They encapsulate a value that may be available now, or in the future, or never, resolving these states into a more manageable form.

How Important Interview Questions Are Intended for Node JS Developers when Hiring?

Build these 5 NodeJS projects to show prospective employers you know the most important Node skills. Plus, once you join, you’ll have the opportunity to ask questions in our private Discord community from me, other students and working tech professionals. Check out our blog on the React roadmap to follow in 2025 to get a better understanding of one of the technologies and explore its functions. This opens a Python console where we may add objects, retrieve objects, modify existing items, and delete objects. Teams can together work on distinct parts of the system and later combine their changes using pull requests. It enables the navigation among views of various components in a React Application, allows changing the browser URL, and keeps the UI in sync with the URL.

• The session identifier is typically sent to the client as a cookie, allowing the server to recognize the user across multiple requests.
• React Hooks are functions that are designed to make sure about all attributes must be statically typed.
• In Node.js, setImmediate() executes a callback immediately after the current event loop phase, while setTimeout() runs the callback after a specified delay.
• Now that we have covered some of the important beginner-level Node.js interview questions, let us look at some of the intermediate-level Node.js interview questions.

Describe the purpose of the module.Exports in Node.js.

• One of them is used to store the current state of the objects and the other to store the previous state of the objects.
• Comments are the statements in your code that are ignored by the compiler and are not executed.
• Implement robust patterns such as callbacks, Promises, or async/await to effectively manage asynchronous errors.
• Also, the functional component AboutPage will obtain the data passed by props.match.params.aboutId.
• However, it is very easy to integrate Redis with NodeJS applications.
• The ‘package.json’ file is a file that contains the metadata about all items in a project.

It acts as a handy approach for relocating a repository offline or sharing upgrades when network connection is not available. Using Spring Boot, we can create applications like Microservices, Console applications, and batch applications. Here, name represents the name of the property you want to configure, and value is the value you want to assign to that property.

How do you handle user authentication and authorization in Node JS?

Node.js is a JavaScript runtime that allows you to run JavaScript on the server. First, you should make sure that the candidate has experience with React and Node.js. Second, you should ask the candidate to show you a sample of their work. Finally, you should make sure that the candidate is comfortable working on both the front-end and back-end of a web application. This mechanism allows Node.js to manage multiple asynchronous operations simultaneously, making it well-suited for handling concurrent requests in web applications and other I/O-intensive tasks. Non-blocking I/O operations allow a single process to serve multiple requests at the same full-stack developer time.

A full app with just Node.js can lead to complex code, so combining Node.js with Express.js leverages speed and simplicity, creating scalable web APIs. MongoDB serves as a document-oriented database manager specifically crafted for the storage of substantial data volumes. It stores data in a binary JSON format and incorporates the concepts of collections and documents.