Installing

To utilize unirest for node.js install the the npm module:

$ npm install unirest

After installing the npm package you can now start simplifying requests like so:

var unirest = require('unirest');

Creating Request

unirest.get("https://topics-extraction.p.rapidapi.com/topics-2.0.php?txtf=plain&uw=n&rt=n&dm=s&sdg=l&st=n&of=json&lang=en&txt=Robert+Downey+Jr+has+topped+Forbes+magazine's+annual+list+of+the+highest+paid+actors+for+the+second+year+in+a+row.+The+49-year-old+star+of+the+Iron+Man+and+Avengers+films+made+an+estimated+%2475m+over+the+past+year%2C+beating+rivals+Dwayne+Johnson%2C+Bradley+Cooper%2C+Chris+Hemsworth+and+Leonardo+DiCaprio.&tt=a")
.header("X-RapidAPI-Host", "topics-extraction.p.rapidapi.com")
.header("X-RapidAPI-Key", "SIGN-UP-FOR-KEY")
.header("accept", "application/json;")
.end(function (result) {
  console.log(result.status, result.headers, result.body);
});