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Middleware that prefixes css on-the-fly. Intended to be used in a development setting with the express.static middleware, but should work with any middleware further down the stack, even an http proxy.

The response will be rewritten under these circumstances:

  • If the response is served with a Content-Type of text/css.

autoprefixer plays nice with conditional GET. If the original response has an ETag, autoprefixer will add to it so the ETag of the compiled response never clashes with the original ETag. That prevents the middleware issuing the original response from being confused into sending a false positive 304 Not Modified if autoprefixer is turned off or removed from the stack later.

Node.js versions below 4

Major versions of autoprefixer higher than 5 will not support node <4, as they rely on features not supported in that version. If you are still using an older version of node.js you should stick to autoprefixer version 5 or lower and use express-autoprefixer version major version 4.

Major version 5 and later of express-autoprefixer will use autoprefixer version 6, and will hence no longer support node older than 4.


Make sure you have node.js and npm installed, then run:

npm install express-autoprefixer

Example usage

var express = require('express'),
    autoprefixer = require('express-autoprefixer'),
    root = '/path/to/my/static/files';
    .use(autoprefixer({ browsers: 'last 2 versions', cascade: false }))


3-clause BSD license -- see the LICENSE file for details.


This module is heavily based on the work of Andreas Lind Petersen (@papandreou) in his module express-compiless.