What are common file extensions for web programming languages?

Question

What file extensions are used most commonly by different languages? Please don't put source file names (like .java) but rather extensions that would be present in a URL for rendered pages.

Here is my (alphabetized) list so far

• ASP Classic
  • asp
• ASP.NET
  • aspx
  • axd
  • asx
  • asmx
  • ashx
• CSS
  • css
• Coldfusion
  • cfm
• Erlang
  • yaws
• Flash
  • swf
• HTML
  • html
  • htm
  • xhtml
  • jhtml
• Java
  • jsp
  • jspx
  • wss
  • do
  • action
• JavaScript
  • js
• Perl
  • pl
• PHP
  • php
  • php4
  • php3
  • phtml
• Python
  • py
• Ruby
  • rb
  • rhtml
• SSI
  • shtml
• XML
  • xml
  • rss
  • svg
• Other (C, perl etc.)
  • cgi
  • dll

Any more? I'll keep updating this based on comments. Largest correct additions (or deletions) is the accepted answer.

Aside: This is for comparing language use online: http://blog.paulisageek.com/2009/10/file-extensions-on-internet.html

Answer 1

Add there:

• ASP.NET
  • .axd
  • .asx
  • .asmx
  • .ashx
  • .aspx

Answer 2

Keep in mind that good URL design will completely hide any underlying file types.

Answer 3

I have created a Github gist that contains a list of programming languages and their extensions, here is a subset of the data included in the gist file:

{
  "name":"CoffeeScript",
  "type":"programming",
  "extensions":[
     ".coffee",
     "._coffee",
     ".cake",
     ".cjsx",
     ".cson",
     ".iced"
   ]
  },{
  "name":"ColdFusion",
  "type":"programming",
  "extensions":[
     ".cfm",
     ".cfml"
  ]}

I hope it is helpful.

languages.json.

Answer 4

.action -- struts2

.do -- struts1

.xml -- XML

.rss -- RSS feeds

.atom -- Atom feeds(RSS)

(no extension) -- used now a days to increase readability of the URL, check stackoverflow URL

Answer 5

.yaws (Erlang Yaws Web Server)

Answer 6

.js, .html, .htm, .xhtml probably deserve a nod.

Answer 7

.aspx .asp .css

Answer 8

AOLServer using Tcl - .adp

Answer 9

REBOL tends to use .r

But .cgi is also used by some for REBOL CGI scripts.

Answer 10

ASP.NET needs a couple more, but I'm not sure this is exhaustive:

• aspx
• ascx
• asmx (web services)

Answer 11

Here's a few of the commonly-used (but rarely enforced) extensions for some CSS dialects:

• .hss for hss style sheets
• .sass for sass style sheets
• .less for less css style sheets
• .ccss or .pcss for clever css style sheets

Answer 12

Ruby also tended to use .rhtml in the past.

Stellent uses the .hcsp extension for its page templates.

I believe Django uses .dtl.

Answer 13

Going old school: .cgi

Typically written in C or Perl

Answer 14

Ruby on Rails also uses the following internally for templates (files that are mostly HTML or JavaScript). So they're not really public facing, and are transparent to the end user/robot.

• .html.erb
• .erb
• .rjs

Used to be that most CGI scripts were written in Perl.

Answer 15

.java .cs and .i_am_kidding_i_read_the_question.

On the serious side, swf (Flash) get hidden by the JS that loads them, generally, but they are extensions usually seen by the client. This is a limit case because it's not like JPEG (doesn't allow for web programming) nor like Javascript. But then, neither is PHP/ASP/JSP because from the client side it's just markup :)

Answer 16

IE specific strangeness:

• .hta -- html application
• .htc -- html components, allows you to alter IE behavior at runtime, from you website!

Also XML:

• .svg -- it's not just an image format!

Answer 17

.json has become popular as a data xfer format

.png .jpg .gif are the most common graphics, but there are others.

Also video extensions

Answer 18

-SSI (Server Side Includes), use the extension .shtml