index.js

var http = require("http")
var https = require("https")

module.exports = {
  shorten: function(url, cb) {
    if (typeof cb === "function") {
      https.get('https://tinyurl.com/api-create.php?url=' + encodeURIComponent(url), res => {
        res.on('data', chunk => {
          cb(chunk.toString())
        })
      }).on("error", err => {
        cb(null, err)
      })
    } else {
      return new Promise((resolve, reject) => {
        https.get('https://tinyurl.com/api-create.php?url=' + encodeURIComponent(url), res => {
          res.on('data', chunk => {
            resolve(chunk.toString())
          })
        }).on("error", err => {
          reject(err)
        })
      })
    }
  },
  shortenWithAlias: function(data, cb) {
    const url = 'https://tinyurl.com/api-create.php?url=' + encodeURIComponent(data.url) + '&alias=' + encodeURIComponent(data.alias);

    if (typeof cb === "function") {
      https.get(url, res => {
        res.on('data', chunk => {
          cb(chunk.toString())
        })
      }).on("error", err => {
        cb(null, err)
      })
    } else {
      return new Promise((resolve, reject) => {
        https.get(url, res => {
          res.on('data', chunk => {
            resolve(chunk.toString())
          })
        }).on("error", err => {
          reject(err)
        })
      })
    }
  },
  resolve: function(url, cb) {
    if (typeof cb === "function") {
			if (url.split(':')[0] == 'http') {
				proto = http
			} else {
				proto = https
			}
      proto.get(url, res => {
        if (res.headers.location) cb(res.headers.location);
        else cb(null, new Error("Tiny URL not found!"));
      })
      .on("error", err => {
        cb(null, err);
      });
    } else {
      return new Promise((resolve, reject) => {
				if (url.split(':')[0] == 'http') {
					proto = http
				} else {
					proto = https
				}
	      proto.get(url, res => {
            if (res.headers.location) resolve(res.headers.location);
            else reject(new Error("Tiny URL not found!"));
          })
          .on("error", err => {
            reject(err);
          });
      });
		}
  }
};