well organized and easy to understand web building tutorials with lots of examples of how to use html, css, javascript, sql, python, php, bootstrap, java, xml and more.

liquid technologies provides xml, json, data mapper and data binding tools. products include an advanced graphical xml editor, xsd editor, json editor, json schema editor, wsdl editor, xml code generator (supporting c#, c++, java, visual basic .net and vb6), graphical data mapper, and web services toolkit. integrates into microsoft visual studio.

free online tools like code beautifiers, code formatters, editors, viewers, minifier, validators, converters for developers: xml, json, css, javascript, java, c#, mxml, sql, csv, excel

altova offers a complete line of desktop developer software for xml, json, sql, and uml; high-performance workflow automation server products; and a cross-platform app development platform.

cloud logging for .net web applications using elmah. find bugs before you go live. powerful search, api, apps for slack, teams, github & visual studio

online json formatter / beautifier and json validator will format json data, and helps to validate, convert json to xml, json to csv. save and share json

stack overflow is the largest, most trusted online community for developers to learn, share​ ​their programming ​knowledge, and build their careers.

github is where over 100 million developers shape the future of software, together. contribute to the open source community, manage your git repositories, review code like a pro, track bugs and features, power your ci/cd and devops workflows, and secure code before you commit it.

the world wide web consortium (w3c) develops standards and guidelines to help everyone build a web based on the principles of accessibility, internationalization, privacy and security.

the web development, programming, internet of things, blockchain and other technologies resource.