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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.
My editor of choice is Visual Studio Code and I was trying to find a basic schema validator and auto-completion for Step Functions. None of the options on the VSCode Marketplace offered this so I looked for a JSON Schema and came across asl-validator by Christophe Bougere. This was a great starting point as VSCode and the YAML extension support JSON schema out of the box. A few changes were necessary to make it play nice with VSCode over a remote URL but that's all it took.