Listen events

main.js

const Web3 = require('web3');

let web3 = new Web3('ws://localhost:8546');
//console.log(web3);

var subscription = web3.eth.subscribe('logs', {
    address: '0x77Db09300A503F5b4828dC12b57659c6ba945Cff',
    topics: ['0x9ec8254969d1974eac8c74afb0c03595b4ffe0a1d7ad8a7f82ed31b9c8542591']
}, function(error, result){
    if (!error)
        console.log("Pringing some result: \n" + JSON.stringify(result));
});

//https://web3js.readthedocs.io/en/v1.3.0/web3-eth-subscribe.html

/*
// unsubscribes the subscription
subscription.unsubscribe(function(error, success){
    if(success)
        console.log('Successfully unsubscribed!');
});*/