title: remove duplicate values from json data
body: <p>I have a json data like this:</p>
  
  <pre><code>{
    "_id": ObjectId("5306e7fd80b1027ad2653db4"),
    "testada": "ecom",
    "id": "27" 
  
  } {
    "_id": ObjectId("5306e81880b1027ad2653db5"),
    "testada": "alorta",
    "id": "27" 
  } {
    "_id": ObjectId("5306e81880b1027ad2653db6"),
    "testada": "france24",
    "id": "23" 
  }
  {
    "_id": ObjectId("5306e81880b1027ad2653db6"),
    "testada": "seloger",
    "id": "23" 
  }
  </code></pre>
  
  <p>From this I have to remove one duplicate entry with <code>id:27</code>, the same as case <code>id:23</code>
  my resulting <code>json</code> looks as follows:</p>
  
  <pre><code>{
    "_id": ObjectId("5306e81880b1027ad2653db5"),
    "testada": "alorta",
    "id": "27" 
  } {
    "_id": ObjectId("5306e81880b1027ad2653db6"),
    "testada": "france24",
    "id": "23" 
  }
  </code></pre>
  
  <p>how it is possible</p>