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JavaScript Kafka Client

1 post · Feb 2021 – Jul 2024

What this trail covers

Confluent Cloud offers an officially supported JavaScript client for Apache Kafka (CJSK), based on librdkafka. This client provides APIs similar to KafkaJS and node-rdkafka, supports TypeScript, and integrates with Confluent Schema Registry and client-side field-level encryption (CSFLE). It offers both callback and promisified APIs for producer and consumer workflows. This post details building an application using the client to settle a debate, demonstrating both producer and consumer functionality.

All Confluent trails
  1. Learn the confluent-kafka-javascript Client by Building an AppThis post introduces the new confluent-kafka-javascript client, detailing its dual API approach (node-rdkafka-based and KafkaJS-like promisified API). It demonstrates producing messages with manual offset commits and consuming messages using the promisified API, including handling `consumer.committed` offsets and `consumer.commit` calls. The example application uses this client to build a real-time voting app, showcasing message production via an Express route and message consumption with WebSocket emission.
  2. Intro to KafkaJS - a Modern Kafka Client for Node.jsThis post introduces KafkaJS, a pure JavaScript Kafka client, and demonstrates its use in building a Node.js application that receives NPM package publish webhooks and publishes messages to Kafka. It covers configuring KafkaJS for connection, setting up a producer to send JSON-serialized messages with package name as key, and outlines the process for consuming messages and sending them to Slack. It also provides instructions for setting up a local Kafka cluster or using Confluent Cloud, and includes a curl command for testing the webhook endpoint.