JSCodeChallenger

JSCodeChallenger is a web app for practicing JavaScript through hands-on coding challenges, built for developers who want to sharpen their skills without signing up for anything.

It solves a simple problem: most coding practice sites require accounts or feel cluttered. This one is free, has no sign-up, and gets straight to the point.

Key features:

• Challenges organized by difficulty, from beginner (arrays, loops, conditionals) to advanced (recursion, algorithms, data structures)
• Built-in Monaco code editor (the same editor used in VS Code) with syntax highlighting and auto-completion
• Instant test feedback so you know right away if your solution works
• Progress tracking saved locally, with visual indicators for completed challenges
• Dark and light mode support
• Fully responsive, works on desktop, tablet, and mobile