Formatting numbers with commas in D3

Question

When I create a chart with D3 the axis labels have commas in them to delimit thousands, millions, etc.

Is there a D3 function that I can call passing it a number and getting back a string formatted with commas like used in the axis? It would be the equivalent of this C#: x.ToString("0,000").

I know there exist libraries to do formatting like this, but I'd like to avoid including additional libraries. I'm using D3 already, so if there is an API in there I can use that would be great.

Answer 1

The syntax for doing this has become more strictly enforced in d3 v4 but looks like:

format = d3.format(",");
formattedX = format(x);

D3 formatting docs

Answer 2

A quick search in the documentation found it:

format = d3.format("0,000");
formattedX = format(x);

https://github.com/mbostock/d3/wiki/Formatting#wiki-d3_format