How does Node.js implement CQRS with Kafka event streams?

Kafka producers emit domain events from Express POST endpoints. Separate query services subscribe and update read models. Eventual consistency across 50+ microservices. Perfect replay for debugging and migrations.

‍Example:-

Code

app.post('/orders', async (req, res) => {
  const orderCreated = await orderService.create(req.body);
  await kafka.producer.send({ topic: 'order-events', messages: [{ value: JSON.stringify(orderCreated) }] });
});