← Back to project

To save as PDF: File → Print → Save as PDF (set margins to None)

STEMigoo
Build Your Own JavaScript Quiz App
💻 Technology

Build Your Own JavaScript Quiz App

Code an interactive quiz in the browser using HTML, CSS, and JavaScript—no frameworks needed, just pure DOM manipulation for ages 13+.

You'll learn

1 DOM manipulation: selecting elements with querySelector and querySelectorAll, reading and changing textContent and innerHTML, adding/removing classes
2 Event handling: addEventListener, event.target, click events, detecting user input and responding to it
3 State management: storing quiz progress (current question index, score) in JavaScript variables, updating the DOM when state changes
4 Conditional logic: if/else statements to check answers, show/hide UI elements, and control quiz flow
5 Arrays and loops: storing questions in an array, iterating through them, and dynamically building answer buttons
6 Function design: writing reusable functions to display questions, check answers, and update the score
1–3 hrs · Intermediate · Ages 13+ · Free

stemigoo.com/projects/javascript-quiz-app-browser

💻 Technology

Build Your Own JavaScript Quiz App

🎯 Intermediate ⏱ 1–3 hrs 👤 Ages 13+ 💰 Free
Build Your Own JavaScript Quiz App

What You Need

  • Text editor (VS Code, Sublime, or Notepad) (~$0 (free))
  • Web browser (Chrome, Firefox, Safari, Edge) (~$0 (free, pre-installed))
  • Computer with internet access (~$0 (your own device))
  • GitHub account (optional, for sharing code) (~$0 (free))
  • MDN Web Docs or JavaScript reference (bookmark in browser) (~$0 (free))
  • Local file system (no software purchase needed) (~$0 (built into OS))

Steps

  1. Set up your HTML skeleton and plan your data — Open your text editor and create a new file called `quiz.html`. Start with a basic HTML5 template: DOCTYPE, html, head, and body tags. In the head, add a title tag and a style tag (you'll write CSS t…
  2. Write the CSS to make it look presentable — In the `<style>` tag in the head, write CSS to make your quiz look clean. Style the quizContainer with a max-width (like 600px), centered on the page using margin auto, padding, and a light backgroun…
  3. Write JavaScript to track the quiz state and display the current question — In a `<script>` tag at the bottom of the body (after your HTML elements), start writing JavaScript. Create variables to track: `currentQuestionIndex` (starts at 0), `score` (starts at 0), and `quizDa…
  4. Add event listeners to detect answer clicks and check correctness — Now add an event listener to each answer button. Write a function called `handleAnswerClick(event)` that fires when a button is clicked. Inside, extract which answer the user clicked using event.targ…
  5. Build the results screen and final score display — Add logic to detect when the quiz is finished. In your displayQuestion() function, check if currentQuestionIndex is greater than or equal to the length of quizData. If it is, call a function `showRes…
  6. Test, debug, and refine the user experience — Play through your quiz a few times. Deliberately choose wrong answers, then right answers. Check for edge cases: Does the first question load on page load? Do the buttons disable after clicking? Does…
  7. + more steps at stemigoo.com/projects/javascript-quiz-app-browser

My Observations

Date: _____________   Location: _______________________

My Sketch / Results

What surprised me most:

I would change: