Brandon Kang

Checking Mobile/RWD applied web sites using Node.js

Blog Post created by Brandon Kang Employee on Jan 25, 2016

One day,

A marketer asked me how she can check if a certain web site has RWD(Responsive Web Design) functionalities or not.

I shared and Do You Use Responsive Web Design | Responsive Design Checker for that.


But the problem is that she had a domain list which included over 20K web sites!

As the previous two services are only providing outs after a web site domain name is input, the services were useless.

I thought that we need an automatic way to get a satisfied test result that's why I coded


The algorithm in it is very simple.

The general Mobile/RWD applied web sites has below properties.


1) They redirects to m dot site. ex) redirects to

2) They redirects to /m/ paths which means mobile transformed pages  ex) redirects to

3) After applying genuine RWD, they don't redirect but they have some domain and path. instead, some magics in HTML source codes are found

- It has @media queries or,

- it has row-fluid functions or,

- it has viewport tags, or

- etc.

After thinking of 1), 2), and 3), I coded RWD checker with Node.js. (to be honest, it is not 100% perfect as the other algorithms should be inserted someday..)

You can see above algorithms are applied after you look at the codes in CDN-Tools/rwdcheck.js at master · BrandonKang/CDN-Tools · GitHub


It need a domain.txt file which has web site domains list in row.

domain.txt example.

Screen Shot 2016-01-25 at 5.59.18 PM.png

Then, the outputs in console screen will be like this. It has comma(,) separator to make cvs file style.

Screen Shot 2016-01-25 at 6.04.30 PM.png

You can easily import a cvs file and export it to the xlsx file to make a report

Screen Shot 2016-01-25 at 6.08.55 PM.png

Hope this tool is helpful to someone.