Top 50 web developer interview questions and answers

Web developer interview questions are common in many organizations and can be used to assess a potential web developer’s skills and knowledge. These Top 50 web developer interview questions and answers should not be too difficult or easy but should test a candidate’s ability to think critically and problem solve. The following is a list of Top 50 web developer interview questions and answers:

Table of Contents

Question 1: How did you become interested in web development?

Answers: When I was younger, I became interested in web development and started making basic websites for fun. I then started to learn more about coding and web development and realized that it was something I was interested in. I then ascertained to explore it as a career.

Question 2: What languages are most serious for web development?

Answers: Web development has seen an explosive increase in current years. There are now so many languages and frameworks available that it can be vital to decide which one to use. The most important language for web development is HTML.

Question 3: What language is most important for web design?

Answers: HTML is an important language for web design.HTML: HTML is the base language for all web pages. It is crucial for creating structured documents and is supported by nearly every browser.

Question 4: What is your favorite software to use for web development?

Answers: There is a vast best software out there for web development. However, my personal favorite is Adobe Dreamweaver. I find it to be a user-friendly and powerful web development tool.

Question 5: What is the difference between SOAP and REST?

Answers: SOAP is a messaging protocol that permits projects to communicate with each other. REST is an architectural style that defines how applications communicate with each other.

Question 6: What is your favorite text editor?

Answers: There are thousands of text editors out there for web development. However, not all of them are perfect for every task. VS Code TextEditor is my beloved text editor.

Question 7: What is the use of a namespace in Web Development?

Answers: A namespace is a naming convention that avoids collisions between class names in different libraries.

Question 8: Explain the critical responsibilities of a Web Developer.

Answers: Web developers are primarily responsible for a site’s coding, design, structure and layout. They are responsible for a website’s technical functionality, including its speed, input capacity, and the amount of traffic it can receive. Besides, web developers may make content for the website and manage the website’s server.

Question 9: What is your favorite database?

Answers: There are countless databases, but which is your favorite? The most popular choices include Microsoft Access, MySQL, Oracle, and SQL Server. Unfortunately, I don’t have a favorite database.

Question 10: What is SVG, and why is it used?

Answers: SVG is short for Scalable Vector Graphics. It is a graphic arrangement for creating and displaying vector graphics on the internet. Vector graphics aren’t based on pixels, like raster graphics. Instead of points, lines, and shapes, vector graphics compose of lines and curves. They can be scaled without losing quality, so they are sometimes used for logos and icons.

Question 11: What is your favorite development environment?

Answers: I like using Visual Studio Code for development because it is lightweight and has many features.

Question 12: What is Webpack?

Answers: A webpack is a module bundler that seamlessly merges framework-dependent modules into static placeholders from which they can be referenced later.

Question 13: Enlist some of the types of CSS used.

Answers: CSS Style Sheets is a style sheet programming language used for elaborating the presentation of a statement written in a markup language. A style sheet is a collection of methods that tells a browser how to show a record written in HTML or XML. CSS styles all HTML tags, involving the project body, headings, title, paragraphs, structure and other text types. 

Question 14: What is your favorite issue tracker?

Answers: I don’t have a favorite issue tracker, and I use the one provided by the project I am working on.

Question 15: How can page loading time be reduced?

Answers: There are many ways to reduce page loading time: 

  • Reduce the number of HTTP requests by using CSS sprites, inline images, and combining files
  • Make fewer DNS lookups by using a content delivery network (CDN)
  • Minimize latency with a CDN
  • Use HTTP Keep-Alive and pipelining
  • Avoid CSS expressions
  • Reduce the number of DOM elements
  • Minimize the size of JavaScript and CSS files
  • Optimize images
  • Use a CSS preprocessor
  • Use a JavaScript preprocessor
  • Cache static content
web developer interview questions and answers

Question 16: What is your favorite code review tool?

Answers: Code reviews can be time-consuming and tedious, but they’re essential to maintaining quality code. I like using a tool called Gerrit.

Question 17: What is your favorite performance testing tool?

Answers: There are different types of tools to choose from when it comes to performance testing, but which is your favorite? My favorite performance testing tool is JMeter.

Question 18: What is your favorite security testing tool?

Answers: I love the Burp Suite. It is a comprehensive set of tools that cover practically every aspect of security testing.

Question 19: What is your favorite web application firewall?

Answers: There is no definitive answer to this question, as everyone’s favorite web application firewall (WAF) will likely differ based on personal preferences and needs. However, some of the more popular web application firewalls today include ModSecurity, Sucuri, Cloudflare, and Incapsula.

Question 20: What is your favorite coding style?

Answers: I prefer coding styles that are clean, consistent, and easy to read. My favorite coding style is probably the Google Java Style Guide.

Question 21: What are CSS selectors? Name some.

Answers: CSS selectors are the part of a CSS rule that determines which element or elements on the page the rule should be applied. Some examples of CSS selectors are: 

  • element selector (e.g. p {…})
  • class selector (e.g. .className {…})
  • id selector (e.g. #idName {…})
  • attribute selector (e.g. [attrName] {…})
  • pseudo-class selector (e.g. :hover {…})
  • pseudo-element selector (e.g. ::before {…})
  • combinators (e.g. div p {…})

Question 22: What is the difference between localStorage and sessionStorage objects?

Answers: LocalStorage persists across all tabs and windows from the same domain. However, SessionStorage is only available in the current tab or window.

Question 23: What is your favorite software development methodology?

Answers: I don’t have a favorite software development methodology, but I think the Agile method is an excellent way to manage software development projects.

Question 24: What is the use of CORS?

Answers: Cross-origin resource sharing (CORS) is a mechanism that permits limited resources on a website page to be requested from another domain outside the domain from which the 1st resource was served.

Question 25: What is a pseudo-class?

Answers: A pseudo-class is a selector component that specifies an element’s state.

Question 26: What is long polling?

Answers: Long polling is a method used to retrieve data from a source where the data may not be immediately available. With long polling, instead of returning immediately with whatever data is available, the polling method waits a certain amount of time for data to become available before returning.

Question 27: What is Namespacing in JavaScript?

Answers: Namespacing is a way to group related code together. In JavaScript, this is usually done by creating objects to hold related code.

Question 28: What is Cross-site Scripting (XSS)?

Answers: Cross-site scripting (XSS) is a computer security vulnerability generally established in web applications. XSS opens attackers to inject customer’s-side scripts into web pages viewed by other users. Additionally, attackers may use a cross-site scripting vulnerability to bypass entrance controls. Cross-site scripting sites accounted for 84% of all surety vulnerabilities documented by Symantec as of 2007. 

Question 29: What is the difference among span and div tag in HTML5?

Answers: The two tags are often used interchangeably, but there is a variety between the two. A <div> is a block-level element, meaning it takes up the entire width of the page. On the other hand, a <span> is an inline element, meaning it only takes up as much width as essential.

Question 30: What are the new form elements introduced in HTML5?

Answers: The new form elements introduced in HTML5 are: 

  • <article>
  •  <aside>
  •  <bdi>
  •  <command> 
  • <details>
  •  <dialog>
  •  <figure>
  •  <figcaption>
  •  <footer> 
  • <header>
  •  <main> 
  • <mark> 
  • <meter>
  •  <nav> 
  • <progress>
  •  <rp>
  •  <rt>
  •  <ruby>
  •  <section> 
  • <summary>
  •  <time> 
  • <wbr>

Question 31: Explain the use of media queries in CSS3.

Answers: A media query is a CSS3 mechanism that allows different stylesheets to be applied to a document based on conditions such as screen size, device type, and orientation.

Question 32: What is the difference between responsive design and adaptive design?

Answers: Responsive design is a web design in which a website provides an optimal viewing experience. Adaptive design is a type of web design in which a website is designed to serve an optimal viewing experience.

difference between responsive design and adaptive design

Question 33: Explain the functional and non-functional requirements.

Answers: Functional requirements describe what a system is supposed to do, while non-functional requirements tell how a system is supposed to do it.

Question 34: Explain the use of Canvas in HTML

Answers: Canvas is an HTML 5 element that allows for dynamic, scriptable rendering of 2D shapes and bitmap images

Question 35: What is your favorite software development library?

Answers: I don’t have a favorite development library, but I like the Python standard library. It has a lot of handy modules that make development a lot easier.

Question 36: What is the difference between IDs and Classes?

Answers: ID selectors are unique and will only select one element, while class selectors can be used on multiple parts.

Question 37: Name the different formats for data exchange.

Answers: There are many different formats for data exchange. However, some designs are more common:

.pdf, .doc, .xls, .ppt, .csv, .txt, .jpg, .gif, .png, .ps

Question 38: Which does HTML5 provide the new APIs?

Answers: The new APIs provided by HTML5 include the <canvas> element, the HTML5 video, and audio elements, and the local storage API.

Question 39: What do you know about HTTP/3?

Answers: HTTP/3 is a new version of the IETF developing HTTP protocol. It is based on the GoogleQUIC protocol and is designed to improve performance, security, and reliability.

Question 40: What is pair programming?

Answers: Pair programming is a software development process in which two programmers work among one workstation to entire a task. One programmer is the “driver,” who writes the code, trice the other is the “observer” or “navigator,” who reviews per step of code as it is typed in.

Question 41: Do you have any experience in developing multilingual websites?

Answers: Multilingual websites are increasingly in demand as browsers, operating systems, and devices worldwide support multiple languages. However, developing a multilingual website can be a complex and time-consuming process. So, no, I have no experience in developing multilingual websites.

Question 42: What is an ETag, and how does it work?

Answers: An ETag is a tag that is assigned to a specific version of a resource. When a resource is requested, the ETag is used to determine if the support has changed since the last time it was implored. If the resource has not changed, the ETag is used to serve the cached version of the resource. If the help has changed, the new version of the resource is retrieved from the server and fits the client. ETags are typically used for resources that are not frequently changing, such as images or stylesheets.

Question 43: What is Ajax?

Answers: Ajax is a web development step for making interactive web applications. Ajax uses a combination of HTML, CSS, and JavaScript to create web pages that are more responsive and interactive.

Question 44: What is W3C, and why is it important?

Answers: The World Wide Web Consortium (W3C) is a universal community that increases standards for the World Wide Web. W3C standards define how the web works and are necessary to reach its complete potential. 

W3C standards are developed through a consensus process, which brings experts worldwide to discuss the latest developments in web technology. 

The W3C process is open to all, and anyone can participate in developing W3C standards. The W3C is essential because its standards ensure that the web is accessible to everyone, regardless of location, device, or ability. W3C standards are also crucial for developing the web as a floor for innovation.

Question 45: What is your favorite software development application library?

Answers: The answer to this question can vary depending on the person’s preferences. Some popular software development libraries include the Java Development Kit (JDK), Apache Commons, and the Google App Engine SDK.

Question 46: List the methods to provide effects in jQuery.

Answers: jQuery provides two methods to create effects: animate() and fade(). 

The animate() process is used to make custom animations. The syntax for the animate() way is: 


The params parameter defines the CSS part to be animated. The properties are described as key/value pairs, separated by commas. 

The speed parameter specifies the duration of the animation. It can be a number in milliseconds or a string representing one of the three predefined speeds: “slow,” “normal,” or “fast.” 

The fade() method is used to create a fading effect. The syntax for the fade() process is: 


The speed parameter specifies the duration of the animation. It can be a number in milliseconds or a string representing one of the three predefined speeds: “slow,” “normal,” or “fast.” 

Question 47: What is your favorite software development application server platform?

Answers: Many great application servers are out there, but my favorite is Tomcat. It’s lightweight, easy to set up and configure, and works well with various programming languages and frameworks.

Question 48: What is the use of comments in JavaScript?

Answers: Comments can be used to elucidate JavaScript code and make it much more readable. Words can also be used to prevent the execution of code.

Question 49: What is Pagination in CSS?

Answers: Pagination separates a document into discrete pages, either electronically or physically.

Question 50: What is Type Coercion in JavaScript?

Answers: Type coercion converts a value from one data type to another. In JavaScript, there are three main ways to convert data types: 

  1. Use the String() function
  2. Use the Number() function
  3. Use the Boolean() function


In conclusion, we’ve compiled 50 of the most commonly asked web developer interview questions and provided answers. This is an excellent resource for learning more about this exciting career field. If you’re looking for an in-depth look at any questions, check out our comprehensive Top 50 web developer interview questions and answers list. Finally, don’t forget to practice your interviewing skills and ask these questions during your following job interview! We provide a simple yet effective way to prepare for the top 50 web developer interview questions and answers. By studying this article and practicing the exercises provided, you can confidently answer any questions thrown your way during your following web developer interview.