How to check your webpages code for errors

There are many automated online programs from checking web syntax

Syntax

HTML

checking HTML syntax

• http://validator.w3.org/

CSS/Stylesheets

Validating CSS syntax, within HTML, or standalone CSS

• http://jigsaw.w3.org/css-validator/

Javascript

Javascript code checking

• http://www.jslint.com/

Java

Java code checker, These programs need to be run on your computer, and are not web-based

• http://pmd.sourceforge.net/
• http://checkstyle.sourceforge.net/
• http://jalopy.sourceforge.net/

RSS/Atom feeds

Checking RSS feed's syntax

• http://validator.w3.org/feed/

robots.txt

Checking syntax for robots.txt, using to control what pages search engines register

• http://www.sxw.org.uk/computing/robots/check.html

Optimizations

Spelling

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Speed

• http://www.websiteoptimization.com/services/analyze/

Broken links

• http://validator.w3.org/checklink

Backwards compatability

• http://www.delorie.com/web/wpbcv.html

mobileOK

Checking mobile

• http://validator.w3.org/mobile/

Other

HTTP Status Codes Checker

Checks servers status codes, for File not found, script error, server error,...

• http://www.seoconsultants.com/tools/headers.asp