how can i find a value of a specified object property in an array using mongoose find

You need $ operator in this way:

  "totalCreatedForms.formName": "formtwo"
  "_id": 0,
  "totalCreatedForms.formIndex.$": 1

Find query has two objects.

The first to match the element you are looking for.

The second one is to indicate which fields returns. So, _id field will not be returned and, from array, only the index where the positional operator is placed, will be returned.

Ouput example is like this:

    "totalCreatedForms": [
        "formIndex": 1

Note that mongo is a data base who store documents and return documents, so this is the easiest way (without aggregation) to get only the value you want instead of the entire array.

Example here

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