Well easy enough, Just download the file and do this:
var json = require('./yourfile.json');
Node will automatically parse this json and now you can access it.
console.log(json);

Now, If you want to do this dynamically by that i mean for user in node.js:
You can do it like this:
First install an http middleware, such as node-fetch
npm install node-fetch
Now you'd go into node and run this up:
var fetch = require('node-fetch');
fetch(`https://twitter.com/i/tfb/v1/tweet_activity/web/poll/USER_ID_HERE`)
.then(res => res.json)
.then((json) => {
// u have your json here now, u can use it here.
})