Master Japanese Vocabulary with This Web App! 
Learning a new language is tough, and let’s be honest, vocabulary is often the biggest hurdle. You’ve got to memorize a bunch of new words, their meanings, and how to pronounce them. If you’re studying Japanese, chances are you’ve come across the popular textbook series, Minna no Nihongo (みんなの日本語). But what if there was a simple, elegant tool to make memorizing those words a little less painful?
This neat web application is a fantastic example of using basic web technologies to build a powerful and engaging learning tool. It focuses on the vocabulary from Minna no Nihongo, Lesson 4, offering multiple ways to practice and reinforce your memory.
The Three Modes of Learning 
This app is more than just a list of words; it’s a complete learning system. Here’s a look at its three main features:
1. Flashcard Mode
This is the heart of the app. It’s designed for active recall—a proven method for effective learning. The flashcards show a Japanese word on the front. When you click or tap the card, it flips over to reveal the pronunciation and English meaning.
The clever part? The app presents each vocabulary word 10 times in a random order. This repetition helps move the words from your short-term memory to your long-term memory, which is essential for true mastery.
2. Quiz Mode (The Ultimate Test) 
You can’t just passively look at words; you have to test yourself! The quiz mode is designed for this. However, it’s not immediately available. The app smartly locks this feature, encouraging you to spend at least one hour in Flashcard or Study Guide mode before unlocking the quiz. This gamified approach motivates you to put in the time and effort before testing your knowledge.
Once unlocked, the quiz presents a Japanese word and three multiple-choice options. You select the correct English meaning and get instant feedback. This is a great way to measure your progress and see which words you still need to work on.
3. Study Guide 
Need to see the whole list at once? The Study Guide mode provides a clean, organized table of all the vocabulary words, their pronunciations, and meanings. It’s a perfect reference for reviewing or studying before you start your flashcard session.
To protect the content, the app adds a few clever layers. A watermark overlays the table, and a JavaScript-based “protection overlay” disables the ability to copy the text. This is a simple but effective way to discourage unauthorized content use.
Why This App Is a Great Learning Tool
This single-page application demonstrates how to build a powerful learning tool without complex frameworks. It’s a testament to the power of a well-structured HTML file, a clean CSS design, and logical JavaScript. The app’s features—spaced repetition, gamified unlocks, and multiple study modes—make it far more effective than just flipping through a static vocabulary list.
So, if you’re learning Japanese and are looking for a simple tool to help with your vocabulary, this code provides an excellent foundation. がんばってください (Ganbatte kudasai)! Good luck!