A browser-based interactive quiz app for studying Japanese Language Proficiency Test (JLPT) N5 and N4 levels. No frameworks, no build tools — just plain HTML, CSS, and JavaScript.

• Two JLPT levels: N5 (265 questions) and N4 (308 questions)
• Multiple question types: Reading, Writing, Context Vocabulary, Synonyms, and Grammar
• Weak questions mode: Automatically tracks your mistakes and lets you focus on problem areas
• Randomized choices: Answer order is shuffled each time to prevent memorization by position
• Keyboard support: Press 1–4 to select answers, Enter/Space to advance
• Persistent stats: Progress is saved in localStorage across sessions
• Mobile-friendly: Responsive design optimized for phones

Try it online: https://keewon.github.io/jlpt

No installation needed. Just serve the files with any static server:

# Python 3
python -m http.server 8000

# Node.js
npx http-server

Then open http://localhost:8000 in your browser.

├── index.html          Main HTML
├── app.js              Quiz logic
├── style.css           Styling
└── data/
    ├── n5.json         265 N5 questions
    └── n4.json         308 N4 questions

1. Select a JLPT level (N5 or N4)
2. Choose a question type filter (or "All")
3. Answer 20 randomly selected questions per session
4. Review wrong answers with explanations at the end
5. Retry missed questions or start a new quiz

• Vanilla JavaScript (ES5)
• CSS3 with custom properties
• No dependencies, no build step