How to check an array inside json data is empty using jmespath?

Question

I have json data as below:

[
  {
    "id": "i_1",
    "name": "abc",
    "address": [
      {
        "city": [
          "city1",
          "city2"
        ]
      },
      {
        "city": [
          "city1",
          "city2"
        ]
      }
    ]
  },
  {
    "id": "i_2",
    "name": "def",
    "address": [
      {
        "city": []
      },
      {
        "city": []
      }
    ]
  }
]

Now, I want only that data where city array is not null. So in the above example the output should be 1st element i.e. with id i_1.

How to filter this json using jmespath library?

Answer 1

You can do this:

var arr = [
  {
    "id": "i_1",
    "name": "abc",
    "address": [
      {
        "city": [
          "city1",
          "city2"
        ]
      },
      {
        "city": [
          "city1",
          "city2"
        ]
      }
    ]
  },
  {
    "id": "i_2",
    "name": "def",
    "address": [
      {
        "city": []
      },
      {
        "city": []
      }
    ]
  }
];

console.log(jmespath.search(arr,"[?not_null(address[].city[])]"));

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