title: Find specific key value in array of objects using nodejs
body: <p>We have a JSON object like </p>
  
  <pre><code>var jsons = {
      "LAPTOP": [{
          "productId": "123"
      }],
      "DESKTOP": [{
          "productId": "456"
      }],
      "MOUSE": [{
          "productId": "789"
      }, {
          "productId": "012"
      }],
      "KEY-BOARD": [{
          "productId": "345"
      }]
  }
  </code></pre>
  
  <p>if we search <code>{ "productId": "012" }</code> it should return key DESKTOP
  It would be great if we can use lodash</p>