Filter Empty Objects in jackson ArrayNode class while serialization

Question

I have a Json:

{  
   "field":[  
      {  
         "key":"123",
         "name":"book1"
      },
      {}
   ]
}

I want to serialize this json to string but in the serialized string i don't want the empty object : "{}".

I need to remove the empty object in the above array node of the json when i am writing jackson JsonNode class to String.

One solution is to iterate the JsonNode beforehand and remove the empty node manually. But i want this empty object to be removed when jackson writes this array node to string. I just want to know if this is possible. Is it possible to override the serialize function of ArrayNode class?

bhargava.prabu · Accepted Answer · 2022-09-06 07:02:16Z

0

Try this

const array = {  
   "field":[  
      {  
         "key":"123",
         "name":"book1"
      },
      {}
   ]
}
const filteredArray = array.field.filter(arr => arr.key);
const stringArray = JSON.stringfy(filteredArray);
console.log(stringArray);

answered Sep 6, 2022 at 7:02

bhargava.prabu

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2 Comments

aizen Over a year ago

in this you are also traversing the array beforeahnd and filtering it before JSON.stringify which increases some computation. I want this to be done somehow internally in JSON.stringify.

bhargava.prabu Over a year ago

Any way you do, you have to filter the array!!

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