nestjs-modular-monolith

You structure a NestJS modular monolith by defining bounded contexts and module boundaries, then applying Clean Architecture layers and CQRS patterns. This ensures state isolation and domain independence, keeping the backend scalable and maintainable.

A modular monolith is a single deployment unit with logically isolated modules following DDD bounded contexts. Use it when starting a new backend to balance monolithic simplicity with modular scalability before evolving to microservices later.

Yes, NX monorepo supports organizing NestJS modular monolith modules. It provides structural tooling to enforce module boundaries, manage bounded context dependencies, and maintain state isolation across the project workspace.

Plan a modular monolith to microservices migration by enforcing strict bounded contexts, state isolation, and clear communication patterns early. This allows individual NestJS modules to be extracted as independent services later.

A modular monolith requires state isolation, meaning modules should manage data independently. While not mandating separate databases, state isolation enforces bounded context decoupling, ensuring modules can be extracted into microservices later.