title: maximum length of a field name in JSON
body: <p>What is the maximum length of a field name in JSON?</p>
  
  <p>For example, in the following json document</p>
  
  <pre><code>{
      "myfield":"value"
  }
  </code></pre>
  
  <p>can I make "myfield" as long as 100 characters?</p>