node-geekdaq is a pure random time-serie generator.
You can use if you just want to test a visualization or processing tool on real-time data, and you don't need to train a real ML algorithm.
See the /samples and /docs directory to see what generated data looks like.
$ npm install geekdaq
var geekdaq = require("geekdaq");
var generator = geekdaq.generator({ range: 5, levels: 100 });
console.log(generator());
console.log(generator());