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When talking about data flows, I mean the path through your system a business process follows. If we take an example from Gopher Holes Unlimited, we can see what happens when a new gopher is added to the system.
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I draw all of my diagrams in a free application called diagrams.net (formerly draw.io). When building critical path diagrams, I put each data flow in its own layer. I then add buttons in the key that toggle the visibility of the layer, making it easy to show/hide entire flows.
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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.
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They loosely adapt to the c4 model for diagramming software architecture. There are nuanced differences and both help drive important information about your app in different ways.
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The flow uses the search mechanism to look for existing gophers. That search endpoint uses AppSync to find gophers from DynamoDB, a helper Lambda function, and by calling an API in the National Rodent Registry.