JavaScript
var chartData = [{"key":"region_09364","values":[{"key":"Exception-0","value":5},{"key":"Exception-1","value":7},{"key":"Exception-2","value":3},{"key":"Exception-3","value":1},{"key":"Exception-4","value":1},{"key":"Exception-5","value":3},{"key":"Exception-6","value":3},{"key":"Exception-7","value":5},{"key":"Exception-8","value":2},{"key":"Exception-9","value":2},{"key":"null","value":6}]},{"key":"region_53989","values":[{"key":"Exception-0","value":5},{"key":"Exception-1","value":6},{"key":"Exception-2","value":4},{"key":"Exception-3","value":7},{"key":"Exception-4","value":3},{"key":"Exception-5","value":7},{"key":"Exception-6","value":4},{"key":"Exception-7","value":3},{"key":"Exception-8","value":4},{"key":"Exception-9","value":6},{"key":"null","value":4}]},{"key":"region_27345","values":[{"key":"Exception-0","value":0},{"key":"Exception-1","value":0},{"key":"Exception-2","value":2},{"key":"Exception-3","value":0},{"key":"Exception-4","value":0},{"key":"Exception-5","value":0},{"key":"Exception-6","value":0},{"key":"Exception-7","value":0},{"key":"Exception-8","value":1},{"key":"Exception-9","value":0},{"key":"null","value":4}]},{"key":"region_59753","values":[{"key":"Exception-0","value":0},{"key":"Exception-1","value":0},{"key":"Exception-2","value":1},{"key":"Exception-3","value":2},{"key":"Exception-4","value":1},{"key":"Exception-5","value":1},{"key":"Exception-6","value":2},{"key":"Exception-7","value":0},{"key":"Exception-8","value":1},{"key":"Exception-9","value":0},{"key":"null","value":10}]}];
nv.addGraph(function() {
var chart = nv.models.multiBarChart()
.margin({top: 20, right: 20, bottom: 90, left: 50})
.stacked(true)
.reduceXTicks(false)
// .staggerLabels(true)
.color(d3.scale.category20().range())
.x(function(d){ return d.key })
.rotateLabels(-45)
.y(function(d){ return d.value })
chart.xAxis
.axisLabel('This is X Axix')
...