how to remove null, {}, [] from json object in node js?

Question

The json format is like that:

 [
  [
  {},
  {
  "Country": "Japan",
  "cityName": "tokyo",
  "onto": [
    {
      "level1": "one",
      "articles": [
        null,
        {
          "id": "114506604",
          "name": "bunya3",           
          "abc": [
             {
              "filename": "attachmentsfilename3",
              "size": 3
             }
           ],
          "image": {}
        }
      ]
    }
  ]
 }
 ],
 [
 {}
 ]
]

We can see few null, {} and [{}]. How can we remove it ? By the way I am using node js. I have tried by nnjson

nnjson.removeNull(obj_summary);

But not works object without key.

Please check if this helps - stackoverflow.com/questions/38275753/… — Raj
– Raj, Commented Mar 10, 2020 at 4:38
Traverse the json recursively (post-order traversal because you want to delete [{}] as well) and delete any unwanted object/array at the end of post order traversal of that object/array. — Tuhin Paul
– Tuhin Paul, Commented Mar 11, 2020 at 0:14
Does this answer your question? How to remove empty values from object using lodash — Rahul Soni
– Rahul Soni, Commented Feb 2, 2022 at 12:02

Tom · Accepted Answer · 2020-03-10 04:36:51Z

If we assume that your data is always going to be an array, we can map over it and remove empty arrays and objects from the first level:

const data = [
  [
    {},
    {
      Country: 'Japan',
      cityName: 'tokyo',
      onto: [
        {
          level1: 'one',
          articles: [
            null,
            {
              id: '114506604',
              name: 'bunya3',
              abc: [
                {
                  filename: 'attachmentsfilename3',
                  size: 3
                }
              ],
              image: {}
            }
          ]
        }
      ]
    }
  ],
  [{}]
]

function clean(input) {
  return input
    .map(item => {

      // remove empty arrays
      if (Array.isArray(item) && item.length === 0) {
        return null
      }

      // Remove empty objects
      if (item instanceof Object && Object.keys(item).length === 0) {
        return null
      }

      return item
    })
    .filter(item => item)
}

console.log(clean(data))

Dharman · Accepted Answer · 2020-03-10 23:58:32Z

0

I found the solution.

To remove null I used:

let retSummary = JSON.parse(stringifySummary, (k, v) => Array.isArray(v) ? 
v.filter(e => e !== null) : v);

To remove {} I used

var newArray = parObj.filter(value => Object.keys(value).length !== 0);

edited Mar 10, 2020 at 23:58

Dharman♦

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answered Mar 10, 2020 at 23:57

Suman Kumar Dash

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