crossfilter on node.js

app.js

var crossfilter = require("crossfilter.js");
//Load your data
var data = [{"a": 1, "b":2}, {"a":2, "b":3}];
//Apply crossfilter
var ndx = crossfilter(data);
var dimension = ndx.dimension(function(d){return d.a});
var group = dimension.group();