accept-parser

var ap = require('accept-parser');

ACCEPT

ap.parse('text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8');
/*
[
	{ item: 'text/html', q: 1000 },
	{ item: 'application/xhtml+xml', q: 1000 },
	{ item: 'application/xml', q: 900 },
	{ item: '*/*', q: 800 }
]
*/

ACCEPT-LANGUAGE

ap.parse('zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3')
/*
[
	{ item: 'zh-CN', q: 1000 },
	{ item: 'zh', q: 800 },
	{ item: 'en-US', q: 500 },
	{ item: 'en', q: 300 }
]
 */

ACCEPT-ENCODING

ap.parse('gzip, deflate')
/*
[
	{ item: 'gzip', q: 1000 },
	{ item: ' deflate', q: 1000 }
]
*/