I am facing almost the same request.
To be concrete: i ve made this little app
where (till now) the only possibility to "save" the configuration is to make an image screenshot of it.
I found the idea of "save" and "load" from the app in the first post above quite good, but in my case I would like that the 3d model I've set up can be call thru a URL Link ? To keep the communication easier when fowarding the online visualisation.
I am still begining with js programming and I guess that files have to be save on the app server if I want to make a configuration callable thru a simple URL link. I wondering also if there is any possibility to save also the uploaded textures (which I call "branding", in my app) in the same file with the configuration parameters on the server, and not separate.
What I am also wondering about the "save" and "load" solution (first post above) is if it is safe? Regarding code injection?
I guess the app is running in the webbrowser localy, so that shouldn't be a problem, but I am not sure.
Thank you in advance for your advices !