validation
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Exalt
ST3A Sublime Text plugin for validating and formatting XML documents -
JsValidate
Validate the syntax of any JavaScript file in Sublime Text using Esprima -
Pretty EDN
ST4 MacLinuxFormat, Validate, Minify EDN files in Sublime Text -
Pretty JSON
Prettify/Minify/Query/Goto/Validate/Lint JSON plugin for Sublime Text 3 & 4 -
W3CValidators
W3C markup validator package for the Sublime Text 2 text editor.