Home > Computers > Internet > Web Design and Development > Authoring > Online Tools > Checking and Debugging > Validation and Lints
http://www.htaccesscheck.com/
Tool to validate .htaccess files and check for syntax errors.
http://shop.alterlinks.com/htaccess-validator/htaccess-validator.php
Online tool to validate the syntax of .htaccess files. Allows to specify and limit the number of Directives to check.
http://csslint.net/
CSS testing tool with multiple options to choose which errors and warnings to test for.
https://formlinter.com/
Tool helps to find common usability and accessibility issues in HTML forms.
https://validator.ampproject.org/
Tool to validate the markup of Accelerated Mobile Pages (AMP).
http://hcard.geekhood.net/
An unofficial validator and conformance checker for the hCard microformat.
http://pro.jsonlint.com/
Tool allows to validate and reformat JSON code.
http://www.freeformatter.com/json-validator.html
Tool to validate JSON files against RFC 4627.
http://www.powermapper.com/products/sortsite/
Scan tool to test and validate web sites for a variety of governmental requirements, web standards and best practices.
http://linter.structured-data.org/
Analyze websites, local files or pasted markup for structured data.
https://developers.google.com/structured-data/testing-tool/
Simple Google tool to validate and test structured data in websites.
http://jigsaw.w3.org/css-validator/
The tool allows to check all levels of CSS code for validity. Sources can be specified by URI, file upload and direct input.
http://validator.w3.org/
A free service from W3C that checks HTML and XHTML code against the W3C Web Accessibility Guidelines.
https://validator.w3.org/unicorn/
Tool to validate (X)HTML, CSS, Mobile OK, RSS and Atom feeds, HTTP headers and internationalization (i18n) at once.
http://webauthoring.tercenim.com/validation.htm
Mark Freeman on free web site validation, featuring HTML, META Tag, Cascading Style Sheet, Accessibility and Link Validation.
https://quuz.org/webvtt/
Tool to validate different kinds of WebVTT files like subtitles, captions, descriptions, metadata, and chapters.
https://www.xml-sitemaps.com/validate-xml-sitemap.html
Tool to validate xml sitemap files and inform search engines about the sitemap location.
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