title: how to delete a record using mongojs
body: <p>I am using mongojs together with nodejs and express. From so many online documents I only found <code>find()</code> <code>save()</code> <code>update()</code> methods.  Is there a <code>delete</code> api ? If so, how to use it? </p>
  
  <p>I am trying to remove one record based on _id which is auto generated by mongdodb...</p>
  
  <p>Any links and examples will be appreciated. </p>