You Probably Don't Know How to Write APIs Like This Using Express

n8n, a Node.js backend application, uses TypeScript decorators and dependency injection for its API structure instead of traditional Express routes. The Server class dynamically loads controllers, handling webhooks and middleware. API endpoints are defined using decorators like @Get() and @Post(), eliminating explicit route definitions. This approach, similar to NestJS, enhances modularity and maintainability. The ActiveWorkflowsController exemplifies how API methods are implemented as class functions with decorators managing routing and authentication.