Code validation and conversion online

A list of places to check the cleanliness of your code online, as well as a helping hand in converting XML to JSON.

W3C

HTML, XHTML, SMIL, MathML, etc.

http://validator.w3.org/#validate_by_input

CSS validator

http://jigsaw.w3.org/css-validator/#validate_by_input

Other validators 

http://www.w3.org/QA/Tools/

JSONLint

http://jsonlint.com

JSLint

http://www.jslint.com

JavaScript Online Lint

http://www.javascriptlint.com/online_lint.php

JSHint

http://www.jshint.com

PHPLint

http://www.icosaedro.it/phplint/phplint-on-line.html

FreeFormatter

XML to JSON convertor, XML - XSD validator, etc.


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