Frontend Developer Interview Questions [2022]

Frontend Developer - Key Role and Responsibilities
  • An experts who design, develop and integrate (UI/UX), etc of the application/website.
  • Frontend developer should know how to integrate RESTful Web-Service or APIs on frontend.
  • A Frontend developer should have good expertise of following tools and technologies -
    • HTML
    • CSS
    • JavaScript
    • jQuery and Ajax
    • CSS Preprocessor - SASS, etc.
    • Design Frameworks - Bootstrap, Material-UI, Tailwind, etc.
    • JavaScript Library/Frameworks - React/Angular/Vue, etc.
    • Version Control Tools (GIT), JIRA, Design and Debuging tools and utilities, etc.
Frontend Developer Interview Questions useful for junior, mid-level and senior frontend developer [Fresher | Experienced].
[Basic] - Frontend Interview Questions
  • What is HTML?
  • What is CSS?
  • What is jQuery?
  • What is Ajax?
  • What is Babel?
  • What is Webpack?
  • What is the difference HTML and HTML5?
  • What is the difference CSS and CSS3?
  • What is CSS Pre-Processor and it's benefits?
  • What is SASS?
  • What is NPM?
  • What is Yarn?
  • What is PWA?
  • What is REST?
  • What is GraphQL?
  • What is differnec between RESTful APIs and GraphQL?
  • Why and when should I Use Babel and Webpack?
  • What are the difference defer and async attributes in script tag?
  • What is the difference between package.json and package-lock.json?
[Intermediate] - Frontend Interview Questions
  • What is CORS?
  • What is Clickjacking?
  • What is KISS principle?
  • What is SOLID principle?
  • What is Cross-Site Scripting (XSS)?
  • What is strict-mode? Explain some advantages and disadvantages?
  • What is difference between apply, call and bind?
  • Explain the difference between internal and external Javascript?
  • Explain the difference between visibility:hidden and display:none?
  • What is the difference between local storage session storage and cookies?
[Advanced] - Frontend Interview Questions
  • What skills are required to become a frontend developer?
  • How would you optimize a website's assets resources?
  • How would you improve website performance?
  • What would you reduce page load time?
  • What is the difference between responsive and adaptive web-design?
  • What is a CDN and what is the benefit of using CDN?
  • What is domain pre-fetching and how does it help with performance?
  • What is the difference between a unit test and a functional test?
  • How do you deal with browser-specific style incompatibility?
  • What security measures would you take while developing a frontend app?
  • What is the advantage of using a code style linting tool?
  • What SEO best practices or techniques do you use in your frontend app?
Important questions which every frontend developer should know: