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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
The site provides basic syntax highlighting with support for autocompleting %fields%, $functions and keywords like HAS. Custom fields and functions can also be added for autocompletion in case they are missing (for example new functions added by a plugin). Functionality for saving and loading code snippets is also available. The editor syntax highlighting is powered by this codemirror6 language package I made https://github.com/s0hv/codemirror-fb2k
The site can be found here https://s0hv.github.io/foobar-autoplaylist/ and the github repository here https://github.com/s0hv/foobar-autoplaylist