How to convert JSON to String in ios Swift?

Try this.

func jsonToString(json: AnyObject){
        do {
          let data1 =  try NSJSONSerialization.dataWithJSONObject(json, options: NSJSONWritingOptions.PrettyPrinted) // first of all convert json to the data
            let convertedString = String(data: data1, encoding: .utf8) // the data will be converted to the string
            print(convertedString) // <-- here is ur string  
            
        } catch let myJSONError {
            print(myJSONError)
        }
      
    }