Node.js Tutorial

1. Go to the official Node.js website at https://nodejs.org.

2. Download the installer for your operating system.

3. Run the installer and follow the instructions.

4. Verify the installation by opening a terminal or command prompt and typing:

This should display the installed Node.js version.

1. Create a new directory for your application:

2. Navigate to the new directory:

3. Create a new file named app.js and open it in your favorite text editor.

4. Add the following code to app.js:

console.log('Hello, World!');

5. Save the file and return to your terminal or command prompt.

6. Run the application:

You should see the following output:

1. Create a new file named server.js and open it in your text editor.

2. Add the following code to server.js:

const http = require('http');

const hostname = '127.0.0.1';
const port = 3000;

const server = http.createServer((req, res) => {
  res.statusCode = 200;
  res.setHeader('Content-Type', 'text/plain');
  res.end('Hello, World!\n');
});

server.listen(port, hostname, () => {
  console.log(`Server running at http://${hostname}:${port}/`);
});
                    

3. Save the file and return to your terminal or command prompt.

4. Run the server:

You should see the following output:

5. Open a web browser and navigate to http://127.0.0.1:3000/. You should see "Hello, World!" displayed on the page.

1. First, install the kafka-node package:

2. Create a new file named kafka-producer.js and open it in your text editor.

3. Add the following code to kafka-producer.js to create a Kafka producer:

const kafka = require('kafka-node');
const Producer = kafka.Producer;
const client = new kafka.KafkaClient({ kafkaHost: 'localhost:9092' });
const producer = new Producer(client);

const payloads = [
  { topic: 'test', messages: 'Hello Kafka', partition: 0 }
];

producer.on('ready', () => {
  producer.send(payloads, (err, data) => {
    console.log(data);
  });
});

producer.on('error', (err) => {
  console.error('Error:', err);
});
                    

4. Save the file and run the producer:

The producer will send a message to the Kafka topic named "test".

5. Next, create a new file named kafka-consumer.js and open it in your text editor.

6. Add the following code to kafka-consumer.js to create a Kafka consumer:

const kafka = require('kafka-node');
const Consumer = kafka.Consumer;
const client = new kafka.KafkaClient({ kafkaHost: 'localhost:9092' });
const consumer = new Consumer(client, [{ topic: 'test', partition: 0 }], { autoCommit: true });

consumer.on('message', (message) => {
  console.log(message);
});

consumer.on('error', (err) => {
  console.error('Error:', err);
});
                    

7. Save the file and run the consumer:

The consumer will receive and log messages from the Kafka topic named "test".