[jQuery] Write jQuery Data

[Niche]

I have 2 servers, a front end and a backend.  I cannot execute server
side scripts on the front end server.  I need to get information from
a form and pass it to my backend server.  I must use Ajax for this.  I
am doing this with jQuery.  I would like to store the form field
information in JSON format and then read it on the backend server.
How would I go about this, thanks.