title: MongoDB: Issue when using mongoexport with --query option
body: <p>When I try to take backup with mongoexport using the --query option to get the documents whose status is equal to A, facing the below error:</p>
  
  <pre><code>mongoexport --port 27017 --db ex --collection A --type=csv --fields _id,status --query '{"status":"A"}' -o eg.csv
  </code></pre>
  
  <p>error validating settings: query ''{status:A}'' is not valid JSON</p>
  
  <p>Please let me know how to use --query option.</p>