Top Frontend Developer Interview Questions

Software Developer
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Particularly for those new to web development, front-end development is recognised as one of the most successful specialties. Many beginners view front-end programming as a good method to begin a career in full-stack development due to the fact that it primarily requires fundamental abilities like HTML, CSS, JavaScript, and some server knowledge.

However, frontend development is a broad field that includes a variety of approaches and equipment. As a result, the kind of questions used in interviews for front-end developer positions vary and cover a range of topics.

You shouldn’t worry if you’re looking for a job as a front-end programmer and don’t know how to prepare for the interview because this article clarifies all the difficult and perplexing front end developer interview questions that interviewers are most likely to ask.

What is frontend Development?

The area of web development known as frontend development focuses on what users see on their end. It centers on converting the code written by backend developers into a graphical interface and ensuring that the data is presented in a straightforward, understandable style.

Without frontend development, a website or web application would only display some confusing codes. People without a background in coding can easily comprehend and use web applications and web pages, thanks to frontend developers.

The things you see when you visit Canva, Facebook, Google Apps, and other websites are the results of the collaboration between frontend and backend developers.

Frontend Developer Interview Questions and Answers

Question 1: What is Lazy loading?

Answer: One method for loading content on the browser according to the user’s needs is lazy loading. This optimizes the use of servers and resources. eCommerce platforms like Flipkart and Amazon provide a practical illustration of this. Only the specifics (price, picture, important characteristics) for the elements that are only visible on the first fold are displayed when you search for a specific product on these websites. The elements below continue to load as and when required as you scroll down.

Question 2: What is React JS?

Answer: ReactJS is an open-source JavaScript front-end library that is mostly used to create user interfaces, particularly for one-page apps. It is also used to manage the view layer for both web and mobile applications. With React, developers can create expansive online applications that can modify data without requiring a page reload. React’s primary goals are to be speedy, scalable, and simple. It relates to the view in the MVC template and only works with user interfaces in the application. It can be used in conjunction with other JavaScript frameworks or libraries, such as MVC’s AngularJS.

Question 3: Why do we recommend external CSS or JavaScript versus Inline?

Answer: Javascript and inline CSS have a negative effect on the speed of websites.

Using inline scripts makes your HTML code heavier, whereas using external scripts shrinks the HTML file size and speeds up webpage rendering.

Inline scripts are better since HTML code is never cached. In contrast, the visitor’s web browser will cache external dependencies like CSS and JavaScript files. As a result, it makes less requests for https each time a user navigates through a website.

Javascript and Inline CSS code maintenance is challenging. When altering the same type of code snippets scattered throughout the website’s files is more preferable to having the code in a single central spot.

Question 4: Describe the advantages of REST web services?

Answer: Some benefits of REST web services are listed below:

  • The learning curve is easy because it uses the HTTP protocol.
  • No agreement is made between the server and the client, hence the program is loosely connected.
  • Three RESTful techniques are easily testable on the browser.
  • It also supports a variety of transmission technologies, including those for text, JSON, XML, and image data.
  • It’s a simple protocol.

Question 5: What is the purpose of using doctypes in HTML?

Answer: In an HTML page, you have probably seen a declaration before the tag. To inform the browser which version of HTML is being used on the page, use the element in HTML. The name of this document type declaration is (DTD).

It is just a directive to the browser that specifies the type of page; it is not strictly a tag or element. It is a null element that lacks a closing tag and cannot contain any content. The HTML version affects the doctype declaration.

Question 6: What is Node.JS for us?

Answer: An open-source JavaScript runtime environment is called Node.JS. It easily makes JS code on the server itself executable. JavaScript code would run on the browser before Node.JS, but NOde radically changed this. To handle the server component, Node.JS is now widely utilized in full-stack development. With the MEAN stack, for example, you can perform full-stack development using just the JS language and several frameworks! This enables the developers to operate across both ends of the web project using a single language (JavaScript)!

Question 7: Mention the difference between MySQL and MongoDB?

Answer: MySQL: SQL is used as a standard language by MySQL, a Relational Database Management System (RDBMS), to manage its database. MySQL uses a structure akin to a table to store data, just as other relational database management systems.

MongoDB: MongoDB is a NoSQL database that stores data pieces in a JSON-like manner. The MongoDB Query Language should be used by the programmer to access and alter data in MongoDB (MQL)


With the help of these thoughtful front-end developer interview questions, you are now well-prepared to formulate and respond to any front-end development-related inquiries.

However, the only portion of the interview covered by these front-end developer interview questions is the technical one. The technical proficiency of a candidate is only one aspect of an interview. As a front-end developer, you should work on your soft skills and social life in addition to preparing for these front-end developer interview questions.

As a recruiter, it is your duty to inquire about a candidate’s time management, personal and team projects, and other topics aside from those covered in the front-end interview.

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Paschal Okafor is NaijaTechGuide Team Lead. The article Top Frontend Developer Interview Questions was written by NaijaTechGuide Team. The article was last modified: November 2nd, 2022
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