Twitter bearer token cannot be fetch

nikosef8ias · 2016-02-13T11:31:00.462Z

gist.github.com

https://gist.github.com/anonymous/e88bfd02f40e83f89e46

test.js

var fs = require("fs");
var https = require("https");
var bearer = "pXZ8xSWvjZjE4UaNntVsCwWPg:ziSswccgj8xm7TGrJ0GcEoVl2tgPaMiNYOWzQeDIhpFTJIMSro"
var base64ed = new Buffer(bearer).toString("base64");

var options = {
	port: 443,
	hostname: "api.twitter.com",
	//	path: "/1.1/search/tweets.json?" + encodeURIComponent("q='social media'"),
	path: "/oauth2/token",

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everything looks fine but this code gives {"errors":[{"code":170,"message":"Missing required parameter: grant_type","label":"forbidden_missing_parameter"}]}