kafka-pub-sub/examples/quickstart/publish.js

Enterprise-grade Kafka publish/subscribe library for Node.js — producer pool, batch sending, DLQ, SSL/SASL, multi-broker, and real-world industry examples.

/**
 * QUICKSTART — Publisher
 *
 * Run subscribe.js in Terminal 1 first, then run this in Terminal 2.
 *
 * Usage:
 *   node examples/quickstart/publish.js
 *   node examples/quickstart/publish.js 5    ← send 5 messages
 */

require('dotenv').config({ path: require('path').resolve(__dirname, '../../.env') });

const { ProduceEvent } = require('../../index');

async function main() {
  const count = parseInt(process.argv[2] || '3', 10);

  console.log(`Publishing ${count} message(s) to "quickstart.topic"...\n`);

  for (let i = 1; i <= count; i++) {
    const data = {
      messageNumber: i,
      text: `Hello from message #${i}`,
      sentAt: new Date().toISOString(),
    };

    await ProduceEvent(
      'quickstart.topic',
      'QUICKSTART_EVENT',
      data,
      { 'x-source': 'quickstart-publisher' },
      { correlationId: `msg-${i}` }
    );

    console.log(`✓ Sent message #${i}:`, JSON.stringify(data));

    // Small delay between messages so you can watch them arrive one by one
    if (i < count) await new Promise((r) => setTimeout(r, 500));
  }

  await ProduceEvent.disconnect();
  console.log('\nDone. Check Terminal 1 to see the messages arrive.');
}

main().catch((err) => {
  console.error('Publisher error:', err.message);
  process.exit(1);
});