Share Link, Hashtag, Text or Username on Twitter using Javascript.

twitter-share.js

let base_url = "http://twitter.com/share?"; // Base url

// Params
const params = {
  url: "http://google.com", 
  text: "Replace this with your text",
  via: "sometwitterusername",
  hashtags: "hashtag1,hashtag2"
};

for(const prop in params) base_url += `&${prop}=${encodeURIComponent(params[prop])}`;

window.open(base_url, '', 'left=0,top=0,width=550,height=450,personalbar=0,toolbar=0,scrollbars=0,resizable=0');