A npm package for testing files or url's again the wc3 validator
JavaScript
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README.md

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w3cjs

A node.js library for testing files or url's against the w3c html validator.

Installation

npm install w3cjs

Usage

var w3cjs = require('w3cjs');

var results = w3cjs.validate({
    file: 'demo.html', // file can either be a local file or a remote file
    //file: 'http://html5boilerplate.com/',
    //input: '<html>...</html>',
    //input: myBuffer,
    output: 'json', // Defaults to 'json', other option includes html
    doctype: 'HTML5', // Defaults false for autodetect
    charset: 'utf-8', // Defaults false for autodetect
    proxy: 'http://proxy:8080', // Default to null
    callback: function (res) {
        console.log(res);
        // depending on the output type, res will either be a json object or a html string
    }
});

Example async testing with Mocha

var w3cjs = require('w3cjs');
describe('html validation', function(){
    it('index page should have no html errors', function(done){
        w3cjs.validate({
            file: 'index.html',
            callback: function (res) {
                    console.log(res);
                if (res.messages.length > 0 ) {
                    throw {error: 'html errors have been found', results: res};
                };
                done();
            }
        })
    })
})

Clicky