AWS Lambda - Validate if domain point to specific IP's

index.js

const dns = require('dns');
const ips = ["XX.XX.XX.XX", "XX.XX.XX.XX"];
exports.handler = (event, context, callback) => {
    // context.callbackWaitsForEmptyEventLoop = false;
    let body = JSON.parse(event.body);
    var done = function(code, message) {
        let response = {
            "statusCode": code,
            "body": JSON.stringify(message)
        };
        callback(null, response);
    };
    dns.lookup(body.domain, (err, address, family) => {
        if (err) {
            done(500, err);
        }
        if (address) {
            var exist = ips.includes(address);
            if (exist) {
                done(200, 'configured');
            }
            else {
                done(404, 'not configured');
            }
        }
        else {
            done(404, 'not configured');
        }
    });
};