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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.
There are multiple ways to upload and send files, including WebRTC datachannels, e.g., https://github.com/guest271314/offscreen-webrtc, WebTransport, WebTorrent https://github.com/jeremyckahn/secure-file-transfer, WebSocket, WebSocketStream, or just using Fetch and Streams. fetch() on Chromium-based browsers also supports duplex:'half' in request init for bi-directional streaming capability.
There are multiple ways to upload and send files, including WebRTC datachannels, e.g., https://github.com/guest271314/offscreen-webrtc, WebTransport, WebTorrent https://github.com/jeremyckahn/secure-file-transfer, WebSocket, WebSocketStream, or just using Fetch and Streams. fetch() on Chromium-based browsers also supports duplex:'half' in request init for bi-directional streaming capability.