run three.js on server with a help of node.js, export model to json and load to end user through ajax

I have a JavaScript app with a requirement to protect the drawing interface of the model so that it is not to public.

I want to use three.js on a server, save the model in JSON format and deliver it the client side. Three.js on the client will display it. But I don't know how to implement it on a server.

Are there any Node.js examples that run three.js apps? If so, how do I save a mesh into JSON format from three.js?

json
node.js
three.js
mesh
sample

But I don't know how to implement it on a server.

three module

Are there any Node.js examples that run three.js apps?

Yes

If so, how do I save a mesh into JSON format from three.js?

three-obj module