title: Convert Json string to Json object in Swift 4
body: <p>I try to convert JSON string to a JSON object but after <code>JSONSerialization</code> the output is <code>nil</code> in JSON.</p>
  
  <p>Response String:</p>
  
  <pre><code>[{\"form_id\":3465,\"canonical_name\":\"df_SAWERQ\",\"form_name\":\"Activity 4 with Images\",\"form_desc\":null}]
  </code></pre>
  
  <p>I try to convert this string with my code below:</p>
  
  <pre><code>let jsonString = response.result.value
  let data: Data? = jsonString?.data(using: .utf8)
  let json = (try? JSONSerialization.jsonObject(with: data, options: [])) as? [String:AnyObject]
   print(json ?? "Empty Data")
  </code></pre>