title: Error parsing parameter '--expression-attribute-values': Invalid JSON: Expecting property name enclosed in double quotes: line 1 column 3 (char 2)
body: <p>I am running the following query</p>
  
  <pre><code>aws dynamodb query `
  --table-name user`
  --key-condition-expression "datecreated = :d" `
  --expression-attribute-values "{ ':d': { 'S': '2018-08-15' } }" --endpoint-url http://localhost:8000
  </code></pre>
  
  <p>Does dynamodb even understand what a double quote is?</p>
  
  <ol>
  <li>I have tried swapping single quotes with double quotes.</li>
  <li>Using double quotes everywhere</li>
  <li>Doubling up the quotes, both single and double</li>
  <li>Using slashes </li>
  <li>Removing single quotes altogether</li>
  </ol>