YSlow analyzes web pages and suggests ways to improve their performance based on a set of [rules for high performance web pages](http://developer.yahoo.com/performance/rules.html
yslow-nodejs is forked from yslow's (https://github.com/marcelduran/yslow) nodejs component and fixed jsdom version to 3.1.2 and upgraded yslow to version 3.1.8
npm install yslow-nodejs -g
yslow-nodejs --help
Usage: yslow-nodejs [options] [file ...]
Options:
-h, --help output usage information
-V, --version output the version number
-i, --info <info> specify the information to display/log (basic|grade|stats|comps|all) [basic]
-f, --format <format> specify the output results format (json|xml|plain) [json]
-r, --ruleset <ruleset> specify the YSlow performance ruleset to be used (ydefault|yslow1|yblog) [ydefault]
-b, --beacon <url> specify an URL to log the results
-d, --dict include dictionary of results fields
-v, --verbose output beacon response information
Examples:
yslow-nodejs file.har
yslow-nodejs -i grade -f xml -b http://server.com/beacon file1.har file2.har
yslow-nodejs --info all --format plain /tmp/*.har
yslow-nodejs -i basic --rulseset yslow1 -d < file.har
curl example.com/file.har | yslow -i grade -b http://server.com/beacon -v
More Info:
https://yslow.org/user-guide/#version2
node
> require('fs').readFile('example.com.har', function (err, data) {
var har = JSON.parse(data),
YSLOW = require('yslow-nodejs').YSLOW,
doc = require('jsdom').jsdom(),
res = YSLOW.harImporter.run(doc, har, 'ydefault'),
content = YSLOW.util.getResults(res.context, 'basic');
console.log(content);
});
{ w: 98725, o: 89, u: 'http%3A%2F%2Fexample.com%2F', r: 9, i: 'ydefault', lt: 981 }Copyright (c) 2012, Yahoo! Inc. All rights reserved.
Copyright (c) 2013, Marcel Duran and other contributors. All rights reserved.
Copyrights licensed under the New BSD License. See the accompanying LICENSE file for terms.