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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 primary relay. By default bluebubbles uses ngrok to relay your messages. The way this works is ngrok exposes your local bb instance to the web. FCM is needed to relay the ngrok url to your clients as if bb is restarted the ngrok url changes (its pretty seemles). Alternatively localtunnel.me is another option or you can manually portforward/setup your own relay. One important thing to note is in the server settings there is a feature called Encrypted messages. Normally your client app is encrypted from client to ngrok (via https) and ngrok to server (via ssh or similar). As a result there is a small risk of your relay service ngrok, localtunnel, or your selfhost solution snooping on message data. To mitigate this you can enable end to end encryption which would mitigate this small risk (ngrok is trusted by github and aws).