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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 core library has a bunch of features that you can read about in its GitHub readme: it provides plugins similar to observablePlugin, but for functions, promises and iterables; it also supports severity levels, optimized production builds and usage in libraries. What I'd like to do here though is talk about a plugin included in the core called badgePlugin, and at the same time give you another, slightly more complex example of using 1log.
So I came up with 1log. Let's jump straight to a basic code snippet and take a look at the log messages that it produces: