css-font-weight-names/css-font-weight-names.json

A JSON Object of all CSS font weight names mapped to their numeric value

{
	"thin": 100,
	"extralight": 200,
	"ultralight": 200,
	"light": 300,
	"book": 400,
	"normal": 400,
	"regular": 400,
	"roman": 400,
	"medium": 500,
	"semibold": 600,
	"demibold": 600,
	"bold": 700,
	"extrabold": 800,
	"ultrabold": 800,
	"black": 900,
	"heavy": 900
}