Swift 2.0 String of JSON to JSON -

i'm working in swift 2.0 , struggling json. pulling json website in form of swift.optional<nsdata>. can convert string using

if let x = nsstring(data: data!, encoding: nsutf8stringencoding){   let y = x string } 

i'm trying json data dictionary in swift , struggling. what's best way this?

update

let task = nsurlsession.sharedsession().datataskwithurl(url!) {(data, response, error) in     if let z = nsjsonserialization.jsonobjectwithdata(data!, options:[]) as? [nsobject: anyobject] {     } 

it errors with

• type of expression ambiguous without more context
• call can throw, not marked 'try' , error not handled

in swift 2, if function "throws" (as nsjsonserialization does), have handle function call inside do ... catch block , use try before throwing function, this:

let task = nsurlsession.sharedsession().datataskwithurl(url!) {(data, response, error) in     {         let z = try nsjsonserialization.jsonobjectwithdata(data!, options:[]) as! [nsobject: anyobject]         print(z)     } catch let myjsonerror {         print(myjsonerror)     } }  task!.resume() 

note in example, possible nsjsonserialization failure handled do...catch , try custom myjsonerror error, possible failure of nsurlsession not handled: still have check error variable in order handle this. because nsjsonserialization "throws" nsurlsession not.