title: How to find the duplicate values in JSON array in javascript?
body: <p>How to find repeated values is present or not in json array?</p>
  
  <p>Json array </p>
  
  <pre><code>{
    "test": [{
        "id": 8,
        "num": 11
      },
      {
        "id": 3,
        "num": 10
      },
      {
        "id": 3,
        "num": 12
      },
    ]
  }
  </code></pre>