I can provide you with a Node.js example for Kafka streaming using Upstash Kafka. Here's a complete implementation:

This implementation provides a complete Kafka streaming application with:

1. A Kafka producer API endpoint to send messages to an input topic
2. A Kafka consumer API endpoint to read messages from an output topic

3. A word count processor that:

   • Reads messages from the input topic
   • Counts words in each message
   • Sends the word counts to the output topic

4. A user interface to:

   • Send messages to Kafka
   • Start the word count processor
   • View received messages and word counts

The code is based on Upstash Kafka integration patterns 12. To use this code, you'll need to set up the following environment variables:

• UPSTASH_KAFKA_ENDPOINT: Your Upstash Kafka endpoint
• UPSTASH_KAFKA_USERNAME: Your Upstash Kafka username
• UPSTASH_KAFKA_PASSWORD: Your Upstash Kafka password

You'll also need to create two topics in your Upstash Kafka cluster:

• input: For sending messages
• output: For receiving processed results

Please make sure to add the following environment variables to your project: