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

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 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 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 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 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 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 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 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 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 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 Overview: This question gives you an idea of the applicant's experience with front end development. It's a good way to screen the interviewee and ensure that they're familiar with the basics of this role.

Sample Answer: I've worked on a number of web applications and sites that use HTML, CSS, and JavaScript. I've also worked on a few mobile applications using Xcode and Swift.

What the interviewer is looking for:
• - A list of front end development projects
• - A description of the applicant's role in these projects
• - A list of technologies used in these projects

Question Overview: This question tests the applicant's understanding of JavaScript and how it handles arguments.

Sample Answer: I pass arguments to JavaScript functions by using the function name as a variable. For example, I might have a function called "showAlert" and pass the message to show as an argument.

What the interviewer is looking for:
• - A clear explanation of how the applicant passes arguments to JS functions
• - Examples of how they pass arguments to JS functions
• - Confidence in explaining this technical concept to any audience

Question Overview: React is a popular JavaScript library that's used for building user interfaces. This question gives you an idea of the applicant's experience with this library.

Sample Answer: I use the componentWillMount method to load data from a remote server and store it in a variable. I use componentDidMount to display this data on the page.

What the interviewer is looking for:
• - Knowledge of the lifecycle methods
• - Examples of how the applicant has used these methods in their code
• - Confidence in explaining these methods to any audience

Question Overview: This question gives you insight into the applicant's background and how they got into the field. It's a good way to see whether they're passionate about the industry and whether they have a solid foundation for their current position.

Sample Answer: I first got into web development when I was in high school. I was a big fan of the internet and wanted to learn how to build my own websites. I started with HTML and CSS and then moved on to JavaScript and PHP.

What the interviewer is looking for:
• - A history of working with computers
• - A history of working with web technologies
• - A history of working with web development tools

Question Overview: This question gives you insight into the applicant's past work and what they're most proud of. You can use this information to determine whether they're a good fit for your company.

Sample Answer: I'm most proud of my work on a website for a non-profit organization. I worked with a team of developers to create a site that was easy to navigate and provided information about the organization's programs and services.

What the interviewer is looking for:
• - A project that shows the applicant's skills and experience
• - A project that shows the applicant's creativity and problem-solving abilities
• - A project that shows the applicant's ability to work within a team

Question Overview: This question gives you insight into the applicant's personality and work ethic. It's important to hire people who are interested in working in a collaborative environment.

Sample Answer: I prefer to work in a quiet environment with minimal distractions. I like to focus on my work and don't like to be interrupted. I also like to work from home on the weekends so I can spend time with my family.

What the interviewer is looking for:
• - The applicant's preferred work environment
• - The applicant's preferred work style
• - The applicant's preferred work schedule

Question Overview: This question tests the applicant's knowledge of JavaScript functions. It's a good way to see whether they have a strong understanding of the language and can apply it to real-world problems.

Sample Answer: The call() function takes a JavaScript object and calls a function on it. The apply() function takes an array of objects and calls a function on each one. I use call() when I want to pass an object to a function and apply() when I want to pass an array of objects to a function.

What the interviewer is looking for:
• - A clear explanation of the difference between call() and apply()
• - Examples of when the applicant has used these functions
• - Confidence in explaining this technical concept to any audience

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