Nats JetStream with NestJS

In the first blog post of this series, we learned how to send serialized data from a React frontend to a NestJS backend with Axios and Cap’n Proto. This blog post will focus on propagating the received data from service to service in a Kubernetes environment using NestJS clients coupled with a Nats JetStream message bus. 

I will explain how to install a properly configured Nats JetStream message bus in a Kubernetes cluster using Helm and Ansible and how to connect the NestJS clients to JetStream afterward. To avoid complexity, we’ll use Minikube, an easy-to-install Kubernetes cluster with just one node. We will also partially use the code and generated data from the last blog article. Both code and data are available on GitHub.

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Cap’n Proto with React and NestJS

In a recent project for a Mayflower client, we used Quarkus Java Microservices with Google Protobuf. In a very abstract sense, our objective was to exchange serialized binary data over a message bus system living in Kubernetes. Therefore I decided to replace the existing tech stack with Typescript, NestJS, and Cap’n Proto IDL (Interactive Data Language).

In this blog post, I will show you how to serialize data using Cap’n Proto in React and send it to a NestJS receiver, which simulates a backend.

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