title: Can JSON start with "["?
body: <p>From what I can read on <a href="http://json.org/" rel="noreferrer">json.org</a>, all JSON strings should start with <code>{</code> (curly brace), and <code>[</code> characters (square brackets) represent an array element in JSON.</p>
  
  <p>I use the <code>json4j</code> library, and I got an input that starts with <code>[</code>, so I didn't think this was valid JSON. I looked briefly at the JSON schema, but I couldn't really find it stated that a JSON file cannot start with <code>[</code>, or that it can only start with <code>{</code>.</p>