Top Front End Developer Interview Questions with Example Answers [2022]

Prepare for your Front End Developer interview by going through these most asked Front End Developer interview questions. Additionally, get access to sample answers and interviewer's expectations.

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  • Question: What is CSS float property and how does it work?
  • Question Overview: This question tests the applicant's knowledge of CSS properties. It's a basic question that helps you determine whether the person you're interviewing has a strong grasp of CSS fundamentals.

    Sample Answer: A CSS float tells the browser to put a particular element to the right side or the left side of the container. I use floats when I'm developing a page that dynamically resizes based on the user resolution.

      What the interviewer is looking for:
    • - A basic definition of CSS float
    • - An explanation of how this property works
    • - A demonstration of how the applicant uses this property in their code

  • Question: What happens when the user enters a URL?
  • Question Overview: This question tests the applicant's knowledge of the HTTP protocol. It's a basic question that can help you determine whether the person you're interviewing has a solid grasp of the basics of web development.

    Sample Answer: The user enters a URL into their browser and the browser sends a request to the server hosting the website. The server then sends back a response that includes the HTML for the page. The browser then renders the page based on this HTML.

      What the interviewer is looking for:
    • - Detailed explanation of the process
    • - Examples of how the applicant uses this knowledge in their work
    • - Confidence in explaining this process to any audience

  • Question: How do you keep up with new technologies?
  • Question Overview: Front end developers need to stay on top of the latest trends in web design and development. This question gives you insight into how they keep themselves informed about the latest developments in their field.

    Sample Answer: I subscribe to several blogs and newsletters that cover the latest developments in web design and development. I also attend conferences and meetups to learn more about the latest trends.

      What the interviewer is looking for:
    • - A list of resources that the applicant uses to stay up-to-date
    • - A history of staying up-to-date with new technologies
    • - A willingness to learn new things

  • Question: How will you differentiate between == and ===?
  • Question Overview: This question tests the applicant's knowledge of the JavaScript language and their ability to spot the difference between two similar operators.

    Sample Answer: === is a strict comparison operator that evaluates both operands and returns true if they're equal. == is a loose comparison operator that evaluates both operands and returns true if they're equal. I use === when I'm comparing objects or numbers for equality.

      What the interviewer is looking for:
    • - A clear explanation of the difference between these two operators
    • - An example of when to use each operator
    • - Confidence in explaining this technical concept to any audience

  • Question: What are the 3 most important languages for front end web development?
  • Question Overview: This question gives you insight into the applicant's knowledge of the most common languages used for front end development.

    Sample Answer: HTML, CSS, and JavaScript are the three most important languages for front end web development. I use these languages on a daily basis to create web applications and pages.

      What the interviewer is looking for:
    • - First-hand experience with the 3 languages
    • - Knowledge of the most important languages for front end development
    • - A list of other languages that the applicant uses

  • Question: Why do you want to work for us?
  • Question Overview: This question gives you insight into the applicant's interest in the company and their desire to work there.

    Sample Answer: I've been a fan of your company for a long time, and I'm excited to get the chance to work here. I think my skillset will be a great fit for your team.

      What the interviewer is looking for:
    • - A clear explanation of why the applicant wants to work for your company
    • - A clear explanation of how they fit into the company's mission
    • - A desire to work for your company

  • Question: What has been the most challenging project you have worked on so far?
  • Question Overview: This question gives you an idea of how the applicant handles difficult projects. It also gives you insight into their past work experience and how they've dealt with problems in the past.

    Sample Answer: The most challenging project I worked on was a website redesign for a large company. I had to work with a team of developers and designers to create a new design that met all of our client's requirements.

      What the interviewer is looking for:
    • - A description of the most challenging project
    • - How the applicant handled the challenge
    • - A description of what they learned from the project

  • Question: What do you like to code?
  • Question Overview: This question gives you an idea of what the applicant is interested in and what they're passionate about. It's a good way to see whether they're interested in the job you're offering.

    Sample Answer: I like to code in JavaScript and HTML5. I also enjoy using Bootstrap for web page layouts.

      What the interviewer is looking for:
    • - A list of the applicant's favorite programming languages
    • - Their favorite web frameworks
    • - A list of their favorite development tools

  • Question: How would you describe the setState method on a React component?
  • Question Overview: This question tests the applicant's knowledge of React, a popular JavaScript library for building user interfaces.

    Sample Answer: The setState method updates a React component's state. I use this method to change the state of a component when a user interacts with it.

      What the interviewer is looking for:
    • - A clear definition of the setState method
    • - Examples of how the applicant uses this method in their code
    • - Confidence in explaining this technical concept to any audience

  • Question: Have you worked on an API?
  • Question Overview: Front end developers often work on applications that are powered by an API. This question gives you an idea of whether the applicant has experience with this type of project.

    Sample Answer: I worked on a project that used an API to pull data from a third-party service. I had to make sure that the application was able to handle large amounts of data and that the data was properly formatted.

      What the interviewer is looking for:
    • - Examples of API-powered projects
    • - Knowledge of how to work with an API
    • - Understanding of how to integrate an API into a web application

  • Question: How will you execute javascript code?
  • Question Overview: This question tests the applicant's knowledge of how to use JavaScript to create a web experience.

    Sample Answer: I'll use jQuery to execute JavaScript on the page. I've used jQuery to create a drop-down menu that appears when the user clicks on a button.

      What the interviewer is looking for:
    • - A clear explanation of how the applicant will execute JavaScript
    • - Examples of how they've used JavaScript in the past
    • - Confidence in explaining this technical concept to any audience

  • Question: How will you process data on the server side?
  • Question Overview: Front end developers need to understand the server side of web development in order to create a seamless experience for the end user. This question gives you an idea of how they approach this aspect of the development process.

    Sample Answer: I'll use PHP to process data on the server side. I've used this language in my previous projects and it's easy to learn and use.

      What the interviewer is looking for:
    • - Examples of server-side processing
    • - Knowledge of common server-side languages
    • - Understanding of how server-side processing works

  • Question: If we were a competing company that lists discounts on hotels how would you set up a landing page?
  • Question Overview: This question tests the applicant's ability to create a landing page for a hypothetical company. It's a good way to see whether they have the creativity and problem-solving skills to create a functional web page.

    Sample Answer: I would create a landing page that shows the hotel discounts and explains how the company works. I would include a prominent call-to-action button that asks users to sign up for their service.

      What the interviewer is looking for:
    • - A creative design for a landing page
    • - A clear explanation of how the applicant would set up the page
    • - A list of the features that would be included on the page

  • Question: What is the difference between http and https protocol?
  • Question Overview: This question tests the applicant's knowledge of web security and the importance of encryption.

    Sample Answer: The https protocol is a secure version of the http protocol. It encrypts all data sent between the server and the browser to prevent hackers from intercepting it.

      What the interviewer is looking for:
    • - A clear explanation of the difference between http and https
    • - Ways to improve security on a website
    • - Knowledge of the different types of encryption

  • Question: Tell me about a time when you had to debug a particularly difficult bug and how did you solve it?
  • Question Overview: This question is a good way to see how the applicant handles difficult situations. It's also a good way to see how they approach debugging and whether they have any unique strategies.

    Sample Answer: I was working on a web application that was supposed to display a list of products. The first time I loaded the page, it displayed an error message. I had to go through the code and find out what was causing the error. I discovered that I had forgotten to include a JavaScript file in the page.

      What the interviewer is looking for:
    • - A detailed explanation of the bug
    • - A description of the steps taken to solve the problem
    • - A willingness to continue working on the bug until it's fixed

  • Question: If you came across a problem that you couldn't solve, what would you do?
  • Question Overview: This question gives you insight into the applicant's problem-solving skills. You want to hire someone who can think outside the box and come up with creative solutions to problems.

    Sample Answer: I would research the problem and see if there are any similar issues that have been addressed. If not, I would try to find a workaround or ask for help from a more experienced developer.

      What the interviewer is looking for:
    • - A willingness to research the problem
    • - A willingness to ask for help
    • - A willingness to try different solutions

  • Question: Can you tell me about yourself?
  • Question Overview: This is a basic question that gives you insight into the applicant's personality and their professional background.

    Sample Answer: I'm a front end developer with five years of experience in web development. I've worked on a variety of projects for clients in the retail, travel, and healthcare industries. I'm passionate about creating great user experiences and have a strong understanding of usability and accessibility standards.

      What the interviewer is looking for:
    • - A brief introduction to the applicant's professional background
    • - A list of relevant skills and experience
    • - A summary of the applicant's personality

  • Question: Write a program that reads in JSON file, translate it and display the results in a responsive design.
  • Question Overview: This question tests the applicant's ability to work with data from a JSON file and translate it into a responsive design. This is a common task for front end developers, so you can use this question to see whether they're familiar with this process.

    Sample Answer: I created a JSON file that contains information about a user's favorite movies. I then used JavaScript to read the file and display a list of movies on the page.

      What the interviewer is looking for:
    • - A working example of the code
    • - A clear explanation of how the code works
    • - A demonstration of the applicant's ability to work with JSON data