MakerDao.js

var Web3=require('web3');
var web3=new Web3("https://mainnet.infura.io/v3/e992178cee28442e86aa8c6611d7d472");
web3.eth.net.isListening()
.then(() => console.log('is connected'))
.catch(e => console.log('Wow. Something went wrong'));

//contract is cat.sol and the event that is emitted during liquidation is BITE
var myContract = new web3.eth.Contract([{"inputs":[{"internalType":"address","name":"vat_","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"ilk","type":"bytes32"},{"indexed":true,"internalType":"address","name":"urn","type":"address"},{"indexed":false,"internalType":"uint256","name":"ink","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"art","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"tab","type":"uint256"},{"indexed":false,"internalType":"address","name":"flip","type":"address"},{"indexed":false,"internalType":"uint256","name":"id","type":"uint256"}],"name":"Bite","type":"event"},{"anonymous":true,"inputs":[{"indexed":true,"internalType":"bytes4","name":"sig","type":"bytes4"},{"indexed":true,"internalType":"address","name":"usr","type":"address"},{"indexed":true,"internalType":"bytes32","name":"arg1","type":"bytes32"},{"indexed":true,"internalType":"bytes32","name":"arg2","type":"bytes32"},{"indexed":false,"internalType":"bytes","name":"data","type":"bytes"}],"name":"LogNote","type":"event"},{"constant":false,"inputs":[{"internalType":"bytes32","name":"ilk","type":"bytes32"},{"internalType":"address","name":"urn","type":"address"}],"name":"bite","outputs":[{"internalType":"uint256","name":"id","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"cage","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"usr","type":"address"}],"name":"deny","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes32","name":"ilk","type":"bytes32"},{"internalType":"bytes32","name":"what","type":"bytes32"},{"internalType":"uint256","name":"data","type":"uint256"}],"name":"file","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes32","name":"what","type":"bytes32"},{"internalType":"address","name":"data","type":"address"}],"name":"file","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes32","name":"ilk","type":"bytes32"},{"internalType":"bytes32","name":"what","type":"bytes32"},{"internalType":"address","name":"flip","type":"address"}],"name":"file","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"ilks","outputs":[{"internalType":"address","name":"flip","type":"address"},{"internalType":"uint256","name":"chop","type":"uint256"},{"internalType":"uint256","name":"lump","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"live","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"usr","type":"address"}],"name":"rely","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"vat","outputs":[{"internalType":"contract VatLike","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"vow","outputs":[{"internalType":"contract VowLike","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"wards","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"}], '0x78F2c2AF65126834c51822F56Be0d7469D7A523E');


myContract.getPastEvents('Bite', {
    //filter: {myIndexedParam: [20,23], myOtherIndexedParam: '0x123456789...'}, // Using an array means OR: e.g. 20 or 23
    fromBlock: 0,
    toBlock: 'latest'
}, function(error, events){ console.log(events[0]); })