executeJson.js

function executeJson(url,method,headers,payload) 
{
    headers = headers || {};
    method = method || 'GET';
    headers["Accept"] = "application/json;odata=verbose";
    var ajaxOptions = 
    {       
       url: url,   
       type: method,  
       contentType: "application/json;odata=verbose",
       headers: headers
    };
    if(payload) {
      ajaxOptions.data = JSON.stringify(payload);
    }  
    return $.ajax(ajaxOptions);
}