NVD3 converting JSON Data - nvd3.js

Question

I have json data in the following format :
[{
"label" : "A Label" ,
"value" : -29.765957771107
} ,
{
"label" : "B Label" ,
"value" : 0
} ,
{
"label" : "C Label" ,
"value" : 32.807804682612
} ,
{
"label" : "D Label" ,
"value" : 196.45946739256
}]
I want to create a bar chart in NVD3 where x coordinates will be label and the y coordinates will be the value. So how can I achieve it. I have gone through many examples where the JSON data was used is a different format but my data is as shown above.
EDITED CODE:
Here is the js code through which I am trying to create a chart in NVD3 .
d3.json("http://localhost:8080/api/study", function(data) {
nv.addGraph(function() {
var chart = nv.models.multiBarHorizontalChart().x(function(d) {
return d.label;
}).y(function(d) {
return d.value;
}).margin({
top : 30,
right : 20,
bottom : 50,
left : 175
}).showValues(true)//Show bar value next to each bar.
.tooltips(true)//Show tooltips on hover.
//.transitionDuration(350)
.showControls(true);
//Allow user to switch between "Grouped" and "Stacked" mode.
chart.yAxis.tickFormat(d3.format(',.2f'));
d3.select('#chart11 svg').datum(data).call(chart);
nv.utils.windowResize(chart.update);
return chart;
});
});

Answer 1

Most charts in nvd3.js have the following data sceleton:
[
{
key: "<Series name>",
color: "<CSS color>",
values: [
{x: 0, y: 10},
{x: 1, y: 20},
{x: 2, y: 30}
....
]
},
{
key: "<Series name>"
...
}
]
In your case the following format will be valid:
[
{
key: "Series 1",
values: [
{
"label" : "A Label" ,
"value" : -29.765957771107
} ,
{
"label" : "B Label" ,
"value" : 0
} ,
{
"label" : "C Label" ,
"value" : 32.807804682612
} ,
{
"label" : "D Label" ,
"value" : 196.45946739256
}
]
}
]
You will need to specify axis properties accessors:
var chart = nv.models.discreteBarChart()
.x(function(d) { return d.label })
.y(function(d) { return d.value })