1-hour NodeJS full-stack developer interview questions by Maxime Topolov

Inheritance and composition allow the reuse of code but in different ways. Composition determines a class as the sum of its parts, whereas inheritance separates one class from another. Through inheritance, classes and objects are closely linked. If to change the parent or superclass, you can break your code.

The full-stack developer should also possess skills in database management systems and other areas of relational mapping you need for the website. You need a proper understanding of MySQL, SQL SERVER and MongoDB etc., to be good at full-stack website development and other programs. Learn about the key requirements, duties, responsibilities, and skills that should be in a full stack developer job description.

Follow this script to detect the best NodeJS / React developers in 1 hour. This method doesn’t generate a new V8 instance, and only a single copy of the node module is active on the processor. As shown below, the async code asks the JavaScript engine running the code to wait for the request.get() function to complete before moving on to the next line for execution. Streams are objects that enable you to read data or write data continuously. It is the foundation of the non-blocking input/output in Node.js, making it one of the most important environmental features.

How would you scale Node application?

Finally, questions should be asked to assess the candidate’s problem-solving skills and ability to work in a team. In summary, asking the right questions during a full stack developer coding interview can help ensure the candidate is the best fit for the role. You have now gained the ability to answer or formulate any full-stack interview question.

Or, are you a recruiter looking out for brilliant full-stack developers? If the answer is yes, you have come to the right place. Why there’s a need to ask these interview questions for Node.js developers? Security is the number one concern of modern-day Internet users. It’s not optional but obligatory to keep your app safe and invincible.

Since Node.js is by default a single thread application, it will run on a single processor core and will not take full advantage of multiple core resources. However, Node.js provides support for deployment on multiple-core systems, to take greater advantage of the hardware. The Cluster module is one of the core Node.js modules and it allows running multiple Node.js worker processes that will share the same port. 1-hour NodeJS full-stack developer interview questions. He is someone who is able to work on both the front end as well as the back end of a website.

The strict mode allows you to run a program with a strict operating context. When the strict use command is used, the browser switches to a strict mode for the operation, which is far safer than the usual JavaScript framework. The strict mode makes the errors apparent and the whole code accurate and transparent for better monitoring. Callback Hell, or the pyramid of doom, is an anti-pattern seen in asynchronous programming codes. It is a situation where you have multiple asynchronous functions and nested if statements or functions.

NPM stands for Node Package Manager, responsible for managing all the packages and modules for Node.js. Make sure you’re well prepared for your dream interview by researching and learning these important questions. There are many factors that contribute to the result of an interview, however, the most important thing is knowing which skill sets are worth investing in.

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Certainly, you’ve heard about various backend technologies and frameworks. But when hiring Node.js/React.js developers, you first want to see proven expertise in Node.js development. Ans – Continuous Integration is the process of implementation of codes that are specially designed & automated for testing. During the time of production, it helps the developers to apply the codes simply. Web developers prefer this process for the integration of codes many times a day. Continuous Integration helps in detecting errors quickly and locating them more easily.

Transform streams are the same as duplex streams, but they can modify or transform the data while reading or writing it. Pass-through streams are a more trivial implementation of transform streams. It simply passes the input bytes across to the output.

Full-stack developer interview questions and answers

If you are the one to hire, you are 36 questions away from finding your perfect candidate. The same-origin policy is a critical security mechanism restricting the interaction between a document from one origin and a document from another origin. This way, you can isolate potentially dangerous documents and prevent security attacks.

You can’t work with a JavaScript runtime environment without knowing JavaScript itself. Ans – Express.js is a web application server framework. Docker can encapsulate legacy applications, allowing you to deploy them to servers that might not otherwise be easy to set up with older packages & software versions. The full-stack engineer job description includes the use of a variety of different technologies and languages ​​(such as Java, JavaScript, HTML, PHP, C#) to develop applications.

Here is a guide to hiring an offshore software developer. David has been developing websites and web applications for all of his adult life. As a software engineer, he’s worked for many diverse software companies from early-stage startups to Google. 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. Before answering, it’s relevant to mention that handling asynchronous operations is complex.

Which database is more popularly used with Node.js?

It does not expose child threads and thread management methods to the developer. Ans – Node.js is a single-threaded application but it supports concurrency via the concept of event and callbacks. The Promise in the entire stack development process is an alternative to call-back functions that manage asynchronous coding operations. Promises have better error handling over callback functions. The Promise function has three states; one is pending, rejected or fulfilled.

Dependency injection is a design pattern implemented to apply the inversion of control on the programming framework. These patterns can be created out of the classes and provided to different classes in many ways. Inversion of Control is a broad term used by programmers and developers to decouple the components and layers of the system. The overall process is done with the help of object-oriented programming. Control of objects or portions of programming is transferred to a framework with the help of inversion of control. Full-stack developers also need to develop skills in version control systems.

Q27 What Is An Event Loop In Nodejs

Ans Long Polling is a pattern in web development that is used to improve pushing data from the server to the client. By using a Long Polling pattern, the Client requests information from the server. The full-stack developer role is a very coveted position for a professional. It takes a lot of skill and capability to aim for the job of a full-stack developer. When sitting for the interview, ensure you are confident and can convince the interviewer that you can handle both the front and back end of the application development.

• Node.js can handle multiple concurrent request, it’s the power of node.js.
• Writable streams serve as an abstraction of a data destination where the data is written.
• It allows multiple threads to exist within the context of a process such that they execute individually but share their process resources.
• Ans – Dependency Injection is a design pattern by which IoC is executed.
• The computation should be without altering the base result.
• On the server (Node.js), the common way has been to use CommonJS.

If we want to create common tasks (properties/methods) for all the objects inherited from the parent object we need to define them in the prototype object. It is an easy way to distinguish a good full-stack developer from someone who is an amateur. People who have difficulty transmitting their thoughts will have bleak chances of getting through at this point. Ans – In Java, a connection leak is a situation when the developer forgets to close the JDBC connection, it is known as a connection leak.

Top 50+ Node.js Interview Questions and Answers for 2023

Also, they should avoid user-supplied input containing malicious SQL from influencing the query logic. This technique enables you to convert data between incompatible type systems with the help of object-oriented programming languages. Relational databases, such as PostgreSQL and MySQL, store data in tables.

Full stack developer interview questions and answers for experienced professionals can vary greatly depending on the level of experience and expertise of the candidate. Additionally, the interviewer may ask the candidate to demonstrate their problem-solving skills by providing examples of challenges they encountered and how they overcame them. Full stack developer interview questions are a critical part of the recruitment process for any business or organization looking to hire a full stack developer.

Intermediate

They are very comfortable in both front-end and back-end languages. The front end comprises a visible part of the application in which the user interacts, while the back end includes business logic. When a request is made to our API, a separate job node js full stack developer is then created and added to a queue. This job will then be executed independently to the requested endpoint, thus allowing the server to respond without delay. If this is your first interview as a full stack developer, youre probably nervous.

The package.json is a json file which holds all the metadata information about your node.js Application. The first argument of the callback is reserved for an error object. If an error occurred, it will be returned by the first https://xcritical.com/ err argument. A callback is a function, which is called automatically at the completion of a given task. Cross-origin resource sharing is a mechanism that allows restricted resources to be requested from another domain/server.