JS Platformer Engine is a lightweight game engine built using HTML5 Canvas and JavaScript, designed to support the development of 2D platformer games. The engine implements a tile-based environment system and provides a complete core gameplay framework, including player movement mechanics, enemy behavior, collectible items, and bonus systems. In addition, it features Map Maker support, allowing developers to visually design and manage game levels efficiently. This engine is suitable for rapid prototyping as well as educational and experimental game development projects on the web platform.