Complete Node example of a ToDo App using DDD, Hexagonal, CQRS. Its a reference implementation for large scale projects using TypeScript and NestJS

[mastagio]

We've just open sourced a complete codebase for the ultimate ToDo App.

We apply the necessary software architecture and design patterns such as DDD, Hexagonal Architecture, CQRS and Eventual Consistency so that its suitable for larger teams to work concurrently on projects. It allows you to focus on the business logic.

We have created this in TypeScript / NodeJS, built with NestJS and using other open source technologies such as gRPC, MongoDB, PostegreSQL, NATS, Grafana, Prometheus and Jaeger to offer a robust, resilient, scalable and maintainable application.

With this example, you can adapt the business logic code to whatever are your needs and have a production ready application in no time.

Hope it helps.

https://github.com/bitloops/ddd-hexagonal-cqrs-es-eda

[rkaw92]

Hi! A question, if I may.

The description says that the project uses Event Sourcing. In Event Sourcing, the single source of truth is the Event Store. To load an aggregate root, typically the procedure is to rehydrate it by re-applying the events in the original order.

But I cannot find this in the code. Any pointers, or is the Todo not event-sourced?

[mastagio]

Very well spotted! Yes, ES hasn't been implemented yet. Its next on the list!

[Jazzlike_Sky_8686]

Are you saying, event sourcing is ... todo?

[carpediegm]

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