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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.
After looking at the encoding for blueprints it appears that they're version prefixed base64 zlib compressed blobs of JSON. This is super inefficient by the way there are way better ways to do this that would be much more performant and yield smaller blueprints. I wondered why pasting large blueprint books into the game caused lag, now I know why. My head is clicking on making a mod that could totally provide the better performance and convert blueprints over on the fly as well as bulk convert existing prints on factorioprints.com