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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 first thing you'll need to do when creating a new script is have a code editor installed. I suggest VS Code for this, although plenty of alternative options exist. Create a new empty file in your editor and save it into your HexChat's addons folder as joincommands.lua (or whatever other name you want, but you will need the .lua file extension). By saving the empty file with the .lua file extension, VS Code will recognize that the file is meant to be Lua code and offer features such as syntax highlighting and code autocompletion.