Confluent Kafka Node.js

Confluent Kafka Node.js is a library that allows Node.js developers to easily interact with Apache Kafka using the Confluent Kafka API. This library offers several features that make it easy for developers to produce, consume, and process messages in their Kafka applications.

Features

Some of the features of Confluent Kafka Node.js include:

• Easy-to-use producer and consumer clients that are fully customizable.
• A callback-based API that makes it easy to handle async operations.
• Support for Node.js streams, including readable streams and writable streams.
• A custom serializer that allows developers to serialize and deserialize data in any format.
• Support for the Confluent Schema Registry that allows developers to use Avro schemas with their Kafka messages.

Installation

To use Confluent Kafka Node.js in your project, you can install it using NPM:

npm install confluent-kafka-nodejs

Producer client example

To create a producer client using Confluent Kafka Node.js, you can use the following code example:

const Kafka = require('confluent-kafka-nodejs');

const producer = new Kafka.Producer({
  'metadata.broker.list': 'localhost:9092',
});

producer.connect();

// Wait for producer to be ready
producer.on('ready', () => {
  console.log('Producer is ready: ');
});

// Handle errors
producer.on('event.error', (err) => {
  console.error('Error from producer:', err);
});

// Send a message
producer.produce({
  topic: 'myTopic',
  messages: ['Hello, Kafka!'],
});

// Disconnect producer
producer.disconnect();

In this example, we create a producer client and connect to a Kafka broker running on localhost:9092. We then send a message to the myTopic topic and disconnect the producer.

Consumer client example

To create a consumer client using Confluent Kafka Node.js, you can use the following code example:

const Kafka = require('confluent-kafka-nodejs');

const consumer = new Kafka.Consumer({
  'group.id': 'myGroup',
  'metadata.broker.list': 'localhost:9092',
});

consumer.connect();

// Subscribe to a topic
consumer.subscribe({
  topic: 'myTopic',
});

// Handle incoming messages
consumer.on('data', (message) => {
  console.log('Received message:', message.value.toString());
});

// Handle errors
consumer.on('event.error', (err) => {
  console.error('Error from consumer:', err);
});

// Disconnect consumer
consumer.disconnect();

In this example, we create a consumer client and connect to a Kafka broker running on localhost:9092. We then subscribe to the myTopic topic and handle incoming messages.

Conclusion

Confluent Kafka Node.js is a feature-rich library that makes it easy for Node.js developers to work with Apache Kafka. With its easy-to-use producer and consumer clients, callback-based API, Node.js stream support, custom serializer, and Confluent Schema Registry integration, Confluent Kafka Node.js is a great choice for any Node.js project that involves Kafka.