Go here for more: https://github.com/AlcaDesign/ComplexTwitchBot/blob/master/lib/twitch-api.js

TwitchAPI.js

const request = require('request'),
	
	_kraken = request.defaults({
		baseUrl: 'https://api.twitch.tv/kraken/',
		headers: {
			'Client-ID': 'CLIENT ID HERE',
			Accept: 'Accept: application/vnd.twitchtv.v5+json'
		},
		json: true
	});

function kraken(options) {
	return opts => new Promise((resolve, reject) =>
		_kraken(opts, (err, res, body) => {
			if(err) {
				return reject({ err, res });
			}
			resolve({ res, body });
		})
	);
}

// Get a user object from a username.
function userByName(login = '') {
	return kraken({
		url: 'users',
		qs: { login }
	})
	.then(({ req, body: { _total, users: [ user ] } }) => {
		if(_total) {
			return user;
		}
		return null;
	});
}

// Get a user object from a user ID.
function user(id = '') {
	return kraken({
		url: `users/${id}`
	});
}

// Get a channel object from a user ID.
function channel(id = '') {
	return kraken({
		url: `channels/${id}`
	});
}

module.exports = {
	channel,
	user,
	userByName
};