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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, Web API and Web Services toolkit. Integrates into Microsoft 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

Mockoon is the easiest and quickest way to run mock REST API servers. No remote deployment, no account required, free, open source and cross-platform.

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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

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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 mobile development platform.