Generate fancy code coverage badges! Does what it says on the tin. Works like this:

$ node coverage-badge 97 coverage.png

... or like this:

var fs = require('fs');
var badge = require('coverage-badge');

var coverage = /* read coverage from JSON or whatever */;
var file = fs.createWriteStream('coverage.png');

badge(coverage).pipe(file);

In other words: use your build tool to tie it to your code coverage report.

The result looks something like this: