Top 50 Full Stack Developer Interview Questions and Answers

The back end consists of a server, an application, and a database. Together, these three enable the visible part of an app to exist. Promises allow additional desirable behavior such as error propagation and chaining. Node.js core modules, as well as most of the community-published ones, follow a pattern whereby the first argument to any callback handler is an optional error object.

A Comprehensive Guide To Becoming a Full-stack Developer – Analytics Insight

A Comprehensive Guide To Becoming a Full-stack Developer.

Posted: Tue, 27 Sep 2022 07:00:00 GMT [source]

REPL provides an environment similar to that of Unix/Linux shell or a window console, in which we can enter the command and the system, in turn, responds with the output. If you’re an experienced full stack Web Developer with a lot of information to share, articles can be a great way to do so. Here the event propagation model identifies that in which order the elements receive the event. It gives you admittance to an external function’s degree from an internal capacity. Docker can be used to create test blocks during deployment to facilitate ongoing integration testing. Docker can be used to provision boxes in the cloud, and with the swarm, you can also manage clusters.

How V8 compiles JavaScript code?

We should not use node.js for cases where the application requires long processing time. So, Node.js is best suited when processing needs less dedicated CPU time. Npm automatically installs all the dependencies mentioned here in the node_module folder of the package. NVM is very helpful if you are working on multiple projects of Node.js having different versions. The second argument of the callback is reserved for any successful response data.

node js full stack developer interview questions

Node thread keeps an event loop and whenever any task gets completed, it fires the corresponding event which signals the event listener function to get executed. Ans – The asynchronous function requires callbacks as a return parameter. When multiple asynchronous functions are chained together then a callback hell situation comes up.

This is why you have to ensure your developers know what security threats to expect and how to prevent them. Why there’s a need to ask these full-stack Node JS developer interview questions? API is something both front-end and back-end developers have to work with. They must know the basics of network data transfer to avoid critical security errors. Inheritance and composition are two programming principles developers use to model relations between classes and objects. Both concepts determine the app’s design and show how the app should function and develop with newly implemented features and changes.

Explain the result of this code execution

In Node.js, however, declaring any variable outside of any function’s scope binds it only to the module’s own scope which therefore makes it much easier and faster to resolve. The time required to run this code in Google Chrome is considerably more than the time required to run it in Node.js. Explain why this is so, even though both use the v8 JavaScript Engine.

node js full stack developer interview questions

The point of this question is to see if they have experience working with it. Child_process is a module enabling accessing the functionalities of the OS by running any system command inside a child process. In JavaScript, the keyword “this” refers to the object it belongs to. It refers to a global object if located alone or in a function, to a local object if located in a method, or to an event if located in an event. Context also refers to objects, but it refers to the object located inside the executed function, while “this” refers to the object the function is executed in.

What is the difference between returning a callback and just calling a callback?

This means that the Participants are numbered 1,2, ..,n-1,n, and participants 1 and n are sitting next to each other. After the Hackathon duration, judges started reviewing the performance of each participant. However, some participants have not finished the project. Each participant needs an extra minute to complete their project. Judges started reviewing the projects sequentially in the clock direction, starting with team x, and it takes them exactly 1 minute to review each project.

Regular functions are quite ordinary, but arrow functions have been introduced recently by ES6 to enable writing concise JS functions. Regular functions are constructible as they can be created with a function declaration or expression. Also, they are callable because they can be called with a “new” keyword.

node js full stack developer interview questions

On is used to add a callback function which will be executed when the event is triggered. Its default size is 4, but it can be changed at startup time by setting the UV_THREADPOOL_SIZE environment variable to any value . The cluster module allows easy creation of child processes that all share server ports.

New trends emerge in the area of full-stack development very quickly. Many trends that are noteworthy when it comes to full-stack development. For example, the rise of multiple programming libraries like ReactJS and VueJS.

What are the main principles of REST?

JavaScript offers different options to handle it, including callback, promises, rxjs, and async/await. Callback hell is one of the problems we sometimes face. The issue appears when we have many asynchronous operations, and we can’t chain them.

Non-relational databases, such as MongoDB, store data in JSON documents. Relation databases are best used when your app has to support dynamic queries. Meanwhile, non-relational databases are the best choice if you prioritize easy scalability. Libuv provides a threadpool (threadpool is global and shared across all event loops.) which can be used to run user code and get notified in the loop thread. Node.js is a single threaded, which in background (Under the hood Node.js uses many threads through libuv) uses multiple threads to execute asynchronous code.

  • The area of full stack development is fast developing, and new tools keep emerging from time to time.
  • There are benefits and drawbacks to using Use Strict in the programming process.
  • The webpage interacts with other resources from different domains and runs with the most optimized resources.
  • Why there’s a need to ask these Node.js interview questions for experienced developers?

If an application has to wait for some I/O operation in order to complete its execution any further than the code responsible for waiting is known as blocking code. The package.json file is normally located at the root directory of your node.js project. It will install all the dependencies to ./node_modules directory.

What are the modules in Node.js?

Full Stack Developers work primarily on the Back End of the application as well as the Front End, or client side. To do their job, Full Stack Developers must have experience in a wide range of coding niches, ranging from databases to graphic design and UI/UX management. node js full stack developer In pair programming, two programmers share one machine and create codes for the project. One of the programmers acts as a driver who creates the code. On the other hand, the other programmer operates as a navigator, helps monitor the process, and reduces error.

When these connections are not properly committed, the whole thing shuts down and permanently closes. There are many web hosting platforms, and you need a thorough understanding and grasp of multiple web hosting platforms for the success of the project you develop. Front-end languages and frameworks like HTML and CSS are skills and capabilities required for you as a full-stack developer. These capabilities help you reach out to style and visual representation abilities on the website you develop.

Node.js Interview Questions and Answers For Experienced Professionals

The Multi-Threaded Request/Response Stateless Model is not followed by the Node JS Platform, and it adheres to the Single-Threaded Event Loop Model. The Node JS Processing paradigm is heavily influenced by the JavaScript Event-based model and the JavaScript callback system. As a result, Node.js can easily manage more concurrent client requests.

If there is no error, the argument will be null or undefined. The event-based model of Node.js solves the problem of blocking input-output operations and uses event loops instead of threads. As for the question “To which level should you normalize your database so that it is acceptable? Yet, the candidate’s answer can show you how confident they feel about databases and how meticulous they are.

Ideally, a candidate must have a few languages that he loves, preferably, some with which he can design the front end and others with which he can take care of the back end. A candidate should be able to demonstrate that well and remember to include the basic most used ones like HTML, CSS, Python, etc. But before jumping into the topic, we will briefly introduce a full-stack developer. Questions asked during the interview help interviewer determine the candidate’s ability level.

As such, it is essential for businesses to ask the right questions when interviewing full stack developers to ensure they are the right fit for the job. When interviewing for a full stack developer role, it is important to ask the right questions to ensure the candidate is the right fit. Questions should focus on the candidate’s experience working with frontend and backend technologies such as HTML, CSS, JavaScript, and Node.js. Additionally, questions should be asked to gauge the candidate’s knowledge of databases, such as MySQL, and server-side scripting languages, such as PHP. It is also important to ask the candidate questions related to the development process, such as their experience with version control and debugging techniques.