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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.
If you’re curious about more details, the full source code for the repo-visualizer is available on GitHub and its readme lists all available configuration options. Configuration options typically get added underneath the with: step.
Here’s a sample from the README.md file in my Visualizing Code talk’s repository:
You can currently use the repository visualization project to view any public repository on GitHub regardless of whether that repository is yours. For example, you can use it to visualize Microsoft’s Cloud Adoption Framework, Vue.js, or even PowerShell and interact with these repositories using a visualization powered by D3.js.