mediator-pattern

A central mediator solves this by routing all interactions through a single coordinator. Components send requests to the mediator, which forwards them to registered handlers while keeping participants unaware of each other.

Design a mediator to act as a central router for your ExpressJS middleware. It forwards ordered processing steps to registered handlers, letting each handler modify the request/response as it moves through the chain without direct peer-to-peer wiring.

Use it when direct peer-to-peer message wiring becomes messy. A chatroom mediator centralizes message flow coordination, routing interactions between multiple participating components through a single dispatcher to avoid monolithic coupling.

Identify your participating components first, then define the mediator's dispatching and processing responsibilities. Ensure components interact only with the mediator router, keeping them unaware of each other to avoid monolithic coupling.

Tight coupling creates tangled dependencies when many components interact directly. A mediator helps by centralizing request routing, reducing complex many-to-many communication down to a single coordinating hub.