This is a playground to test JavaScript. It runs a completely standard copy of Node.js on a virtual server created just for you. Every one of npm’s 300,000+ packages are pre-installed, so try it out:
// Let's show where the Internation Space Station currently is.
console.log("Let's see where the ISS is with Node " + process.version);
// We can use any package from NPM since they are all built in.
var getJSON = require("async-get-json");
// And we can use ES7 async/await to pull the ISS's position from the open API.
var result = await getJSON("http://api.open-notify.org/iss-now.json");
// RunKit will automatically display the last statement and try to find its best representation:
result.iss_position;