Express Di

Overview:

express-di is a module that allows for Dependency Injection (DI) in Express.js applications. By monkey-patching Express, it enables developers to define dependencies using the app.factory() method and follow the DI pattern in their routes. This helps in passing variables between middlewares more efficiently and controllably.

Features:

• Dependency Injection Support: Define dependencies using the app.factory() method.
• Default Dependencies: Pre-defined dependencies like req, res, and next.
• Cache Mechanism: Caches dependencies per request for improved performance.
• Route-specific Middlewares: Use DI in route-specific middlewares like app.get(), app.post(), etc.
• Sub App Support: Allows for sub-applications with inherited dependencies.
• Performance Optimization: DI process executed once at startup for minimal impact on performance.
• Testing Support: Includes test scripts and coverage reports.

Summary:

express-di is a module for Express.js that facilitates Dependency Injection, allowing developers to define and use dependencies in a more organized and efficient manner. By providing support for default dependencies, cache mechanisms, testing scripts, and sub-applications, express-di enhances the modularity and performance of Express applications.