Question

I want to send a JSON object to facebook, but only using javascript/ajax i.e client side scripting language

the problem is how to send the user credentials in the JQuery/JSON twitter/fb API calls.
my user credentials are from facebook OAuth.

Answer 1

I’m still not sure what you mean by “send a JSON object to facebook” but I’ll try to answer what I do understand.

In the documentation they include an example of how it’s done, go to the section titled Client-side Flow.
You can also use the javascript sdk of course, something like:

FB.getLoginStatus(function(response) {
    if (response.status === "connected") {
        loggedIn();
    }
    else {
        // status is either "not_authorized" or not logged in to facebook
        FB.login(function(response) {
            if (response.authResponse) {
                loggedIn();
            }
            else {
                // user not logged in or did not authorize the app
            }
        }
    }
}

This will first check if the user is already logged in and authorized your app, if not will try to. The code is not tested in anyway, I “glued” it from different examples.
Please read the documentation of the sdk.