The U.S. Bureau of Labor Statistics reports that job opportunities in the field of web development will increase by eight percent between 2019 and 2029, which is faster than the average for any other profession.

The high demand for web developers is being driven by the rising popularity of e-commerce platforms and mobile-based applications, according to the Bureau of Labor Statistics.

Web developers, with a deep understanding of popular technologies, such as JavaScript, HTML5, and CSS3, are the most sought after professionals in the IT industry today. However, to get a dream job, you will first have to prepare yourself for tough interviews.

In this article, we are going to list the most commonly-asked web development interview questions you are likely to encounter. We have divided the questions into two parts — for beginners and for experienced web developers. Taking a quick look at these web developer interview questions and answers will give you a boost of confidence when you appear in any web development interview, no matter at which stage you are in your career. 

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Section-I. Top Web Developer Interview Questions for Freshers

If you’re a beginner looking to start your career in web development, you are expected to be aware of certain basics, not only pertaining to the concepts but also to the field as a whole. Here are some of the frequently-asked junior web developer interview questions. Knowing the answers to these will offer a good grasp of basics that you can leverage in interviews for web developer positions. 

1. What skills should a good Web Developer have?

Web development professionals should have the following key skills: 

  • Proficiency in Hypertext Markup Language (HTML) and Cascading Style Sheets (CSS)
  • In-depth knowledge of Python, Ruby, and PHP
  • Familiarity with DSL (Domain Specific Language), such as SQL
  • A strong sense of JavaScript and JavaScript libraries, including JQuery
  • Problem-solving capabilities

2. Are you aware of the roles and responsibilities of a Web Developer?

The primary responsibilities of a web developer include:

  • Testing and debugging web applications
  • Designing, developing, and deploying web applications
  • Uploading websites onto servers and registering them with multiple search engines
  • Coordinating with other programmers and designers to ensure the smooth development of web projects
  • Fixing bugs, troubleshooting, and resolving problems
  • Implementing contingency plans in the case of system failures 
  • Developing proper code structures for solving specific tasks
  • Providing support in the maintenance and upkeep of websites

3. What are the added benefits of HTTP/2 compared to HTTP 1.1?

HTTP/2 has a number of notable advantages over HTTP 1.1, which are: 

  • Advanced server-push technology
  • Reduced network footprint
  • Uses network resources more effectively
  • Eliminates security issues related to HTTP 1.1, such as a response splitting attack
  • Enables superior capabilities, including effective TLS handling,  prioritization, multiplexing, compression, and flow control
  • Compact command representation, which facilitates easier implementation and processing 
  • Robust and efficient data processing between server and client 
  • Improved throughput and lower network latency
  • Less error-prone

4. Can you list a few ways to speed up Page Loading?

The following actions should be performed to improve page loading speed:

  • Decrease image size
  • Clear unwanted widgets
  • HTTP compression
  • Placing script reference in the bottom and CSS on the top 
  • Reduce redirects
  • Minimize lookups
  • Caching

5. How is XHTML different from HTML?

XHTML differs from HTML in many ways, for example:

  • All tags in XHTML must be in lowercase
  • XHTML requires the use of double quotes for all attributes
  • In XHTML, tags must be properly closed  
  • XHTML does not permit an inline element to contain a block-level element 

Section-II. Web Developer Interview Questions for Experienced Web Developers 

If you’ve had some experience as a web developer and are interviewing for senior web developer positions, then you are likely to come across some of these frequently-asked senior web developer interview questions. 

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6. How does CORS work?

An HTML5-supported mechanism, Cross-Origin Resource Sharing, or CORS, enables the requesting of resources on web pages from other domains outside the domains from where the resources originated. 

7. What is an Entity Tag?

An Entity Tag, or ETag, is an integral element of HTTP (Hypertext Transfer Protocol) - the protocol that facilitates communication between servers and web browsers. Entity Tag is one of the many mechanisms that the Hypertext Transfer Protocol provides for cache validation, allowing conditional requests from a client.

8. Can you define what Long Polling is?

Long polling is a method to maintain a persistent connection to the server. Long polling keeps the client’s connection intact and open till the server can transmit data to any client. The connection closes only after data is returned to a client, or when a connection timeout happens. 

9. What is DTD and what is the difference between PCDATA and CDATA in DTD?

DTD is short for Document Type Definition. It defines attributes, structure, and legal elements of XML documents.

PCDATA, or Parsed Character Data in the DTD, is the text that the XML parser will parse. Tags within the text are processed as markup, and the entities are expanded.

CDATA, or Character Data in the DTD, is the text that the XML parser will not parse. Tags within the text are not processed as markup, and the entities are not expanded.

10. What are the APIs that the HTML5 standard provides?

HTML5 incorporates a variety of APIs, such as:

  • History API
  • Constraint Validation 
  • Application Cache
  • Command API
  • User Interaction
  • Data Transfer
  • Text Track 
  • Media API

Interview Questions for MEAN Stack Developer

An open-source, free JavaScript-based technology, MEAN includes 4 JavaScript software stacks - Node.js., AngularJS, ExpressJS, and MongoDB - that are used to develop dynamic web applications and websites. Here are the most commonly-asked MEAN stack web development interview questions and answers:

11. What is a Blocking Code?

If an application needs to await an I/O (Input/output) operation for completion of its execution, the code that is responsible for the waiting is called a blocking code.

12. What is the CSS Grid System?

Integrating 2 key components, columns and rows, CSS Grid Systems allow for both horizontal and vertical content stacking in an easily manageable and consistent manner.

CSS Grid Systems include:

  • Flexbox Grid
  • Foundation
  • Bootstrap
  • Pure
  • Simple Grid

13. What are Angular Route Guards?

Route guards or routing guards in Angular are interfaces that tell a router whether it should permit navigation to the requested route. Route guards make decisions based on the return value of false/true, which comes from the classes that implement the guard interfaces.

14. Can you compare MongoDB and SQL Databases?

Data is stored as columns, rows, tables, and records on SQL databases. The data storage takes place on a pre-defined model that is not elastic enough to support the needs of today's new-generation applications. MongoDB, on the contrary, adopts a flexible architecture that users can easily modify.

15. Are all the Object-Oriented Programming Principles supported in Typescript?

Yes, TypeScript supports and implements all 4 object-oriented programming principles, which are:

  • Polymorphism
  • Abstraction
  • Inheritance
  • Encapsulation
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Get Started — Become a Full-Stack Web Developer in 9 Months!

The term stack encompasses products and technologies that constitute the backbone and technological ecosystem for creating and managing web applications. A stack, in practice, includes databases, application frameworks, runtimes, and client-side architectures. Depending on project requirements, full-stack developers use various front-end and back-end stack components, including Ruby on Rails, LAMP, MERN, and MEAN to ensure optimal efficiency. 

Full-stack web development is one of the top employment opportunities in the world today, both in terms of scope and demand. Several multinational companies are looking for full-stack web developers for their all-round knowledge of UI/UX, product testing via Minimum Viable Product (MVP) cycles, app development environments, and mobile-first solutions. 

If you are keen on pursuing a full-stack web development career, check out the industry-recognized Post Graduate Program in Full Stack Web Development, offered by the world’s #1 online bootcamp and certification provider, Simplilearn, in association with the California Institute of Technology (Caltech) Center for Technology and Management Education (CTME).  

Simplilearn’s leading-edge full-stack web development training program teaches 30+ in-demand tools, and it provides access to 250+ hours of applied learning, twenty lesson-end and five phase-end projects, masterclasses from Caltech CTME faculty, online convocation by Caltech CTME Program Director, and capstone projects in four domains. Click here to get certified by the Caltech CTME. 

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