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AnyChart
AnyChart is a lightweight and robust JavaScript charting solution with great API and documentation. The chart types and unique features are numerous, the library works easily with any development stack.
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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.
In this tutorial, we will use AnyChart as an example, and the visualization will be built following its calendar chart documentation. This library is free for non-commercial use and has many examples for the various chart types and options. So if you are a beginner, it still looks good for you to start.
To make this guide not only educating but also entertaining, I decided to reproduce GitHub’s calendar graph and visualize the repository contribution activity of Mike Bostock, a prominent computer scientist known globally as one of the creators of the open-source JavaScript charting library D3.js and of the interactive data visualization development platform Observable. So, we’ll also get a telling picture of how he performed in that regard!