Re-using object in nodejs

So I am running automated test using selenium

I have below code in test.js

driver = new webdriver.Builder().withCapabilities(webdriver.Capabilities.chrome()).setChromeOptions(o).build();

Above code opens new browser every time when i run it using command node test.js

But I want to save the object driver and then reuse it.. so that when i run node test.js it wont reopen the browser..but use already opened browser.So I tried something like below and it failed with json error , unexpected ending

var savefile = fs.writeFile('data.json', JSON.stringify(util.inspect(driver)) , 'utf-8');
var parsedJSON = require('./data.json');
console.log(parsedJSON);

so I tried like if file exist , use the object from file .. else create new object.Will above method actually work or is there any other method.

via Vishnu