html-sanitiser is a simple and straightforward HTML sanitiser. It includes whitelists for elements, attributes, protocols in certain URI attributes, as well as of CSS properties (and in some cases values) inside the style attribute.
I make no claims as to how secure it is. If you plan on using this in a critical situation, please ensure that you have properly tested it first.
For the most part it is a port of the sanitiser that ships with Rails though naturally bugs may have been introduced in the port.
var san = require("html-sanitiser"); var saneHTML = san.sanitiseHTML(dirtyHTML);
npm install html-sanitiser
This module exports two methods, sanitiseHTML() and sanitiseCSS(). You're only ever likely to need the former, but sanitiseHTML() calls sanitiseCSS() in order to clean up the CSS properties in style attributes, and as such it accepts the same options that it then passes on.
sanitiseHTML() takes a string of dirty HTML and optionally a literal object of options that can modify its behaviour. It returns a string of presumably sane HTML. It accepts the following options (look at the source for the default values, they're right at the top):
sanitiseCSS() takes a string of dirty CSS properties as they would appear in a style attribute and optionally a literal object of options that can modify its behaviour. It returns a presumably sane string of CSS properties. It accepts the following options (look at the source for the default values, they're right at the top):
Under the hood this currently uses the jsdom module in order to properly parse the HTML and manipulate it before serialising it anew. This is not necessarily the fastest approach on Earth, but in my experience it hasn't proved to be a problem. YMMV though, and if this becomes an issue it's entirely possible to look at alternative approaches.
(The MIT License)
Copyright (c) 2011-2012 Robin Berjon <email@example.com>
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.