1send.js

#!/usr/bin/env node

var amqp = require('amqplib/callback_api'); //get the library

//connect to RabbitMQ server
amqp.connect('amqp://localhost', function(error0, connection) {
    if(error0){
        throw error0;
    }
    connection.createChannel(function(error1, channel) {
        if(error1){
            throw error1;
        }
        var queue = 'hello';
        var msg = 'Hello world';

        channel.assertQueue(queue, {
            durable: false
        });

        channel.sendToQueue(queue, Buffer.from(msg));
        console.log(" [x] Sent %s", msg);

    });
    setTimeout(function() {
        connection.close();
        process.exit(0);
    }, 500);
});