Sign Up for Free

RunKit +

Try any Node.js package right in your browser

This is a playground to test code. It runs a full Node.js environment and already has all of npm’s 400,000 packages pre-installed, including cssjanus with all npm packages installed. Try it out:

var cssjanus = require("cssjanus")

This service is provided by RunKit and is not affiliated with npm, Inc or the package authors.

cssjanus v1.2.0

Converts CSS stylesheets between left-to-right and right-to-left.

Build Status npm


Converts CSS stylesheets between left-to-right and right-to-left.

Based the original CSSJanus Google project.


npm install cssjanus

Basic usage

var cssjanus = require( 'cssjanus' );
var rtlCss = cssjanus.transform( ltrCss );

Advanced usage

transform( css, swapLtrRtlInUrl, swapLeftRightInUrl )
  • css (String) Stylesheet to transform
  • swapLtrRtlInUrl (Boolean) Swap 'ltr' and 'rtl' in URLs
  • swapLeftRightInUrl (Boolean) Swap 'left' and 'right' in URLs

Preventing flipping

Use a /* @noflip */ comment to protect a rule from being changed.

.rule1 {
  /* Will be converted to margin-right */
  margin-left: 1em;
/* @noflip */
.rule2 {
  /* Will be preserved as margin-left */
  margin-left: 1em;

See also


RunKit is a free, in-browser JavaScript dev environment for prototyping Node.js code, with every npm package installed. Sign up to share your code.
Sign Up for Free