How to resolve nodejs deprecation warning - RFC 6066 - seems to be coming from kafkajs

[adbdkb]

I am trying to create a sample nodejs app for kafkajs producer and consumer. When I start the app, I get the deprecation warning. So, I tried with --trace-deprecation flag and get this stack trace. How can I fix it? I tried using different versions of kafkajs, but still keep getting this error

(node:61452) [DEP0123] DeprecationWarning: Setting the TLS ServerName to an IP address is not permitted by RFC 6066. This will be ignored in a future version. at Object.connect (node:_tls_wrap:1670:15) at /BitBucketRepos/node-js/SimpleProducerConsumer/node_modules/kafkajs/src/network/socketFactory.js:12:13 at module.exports (/BitBucketRepos/node-js/SimpleProducerConsumer/node_modules/kafkajs/src/network/socket.js:24:18) at /BitBucketRepos/node-js/SimpleProducerConsumer/node_modules/kafkajs/src/network/connection.js:240:23 at new Promise (<anonymous>) at Connection.connect (/BitBucketRepos/node-js/SimpleProducerConsumer/node_modules/kafkajs/src/network/connection.js:167:12) at ConnectionPool.getConnection (/BitBucketRepos/node-js/SimpleProducerConsumer/node_modules/kafkajs/src/network/connectionPool.js:56:24) at Broker.connect (/BitBucketRepos/node-js/SimpleProducerConsumer/node_modules/kafkajs/src/broker/index.js:86:52) at process.processTicksAndRejections (node:internal/process/task_queues:95:5) at async /BitBucketRepos/node-js/SimpleProducerConsumer/node_modules/kafkajs/src/cluster/brokerPool.js:319:9

I have tried with using ksfkajs version 1.15.0, 1.16.0, 2.1.0 in package.json - but keep getting the same error.

My current NodeJs version is 18.0.0

How can I eliminate this warning?

[Nevon]

This can be worked around by setting ssl.servername to a hostname. If you don't set it, we default it to the broker host, which can be an IP. You can see an example of fixing this in our example clients:

kafkajs/examples/admin.js

Lines 9 to 24 in a0ef955

	const kafka = new Kafka({
	logLevel: logLevel.INFO,
	logCreator: PrettyConsoleLogger,
	brokers: [`${host}:9094`, `${host}:9097`, `${host}:9100`],
	clientId: 'test-admin-id',
	ssl: {
	servername: 'localhost',
	rejectUnauthorized: false,
	ca: [fs.readFileSync('./testHelpers/certs/cert-signed', 'utf-8')],
	},
	sasl: {
	mechanism: 'plain',
	username: 'test',
	password: 'testtest',
	},
	})

#1425 will fix this by not defaulting the servername if the host is an IP address.