convert Map<String, Object> to json in javascript

Question

I have a Map<String, Object> and I want to convert it to JSON .

Here is what I have:
Point 1: Declaring variables

var map = new Map(), //map
jsonObject= {}, // oject that needs to be converted to JSON
value1 = { topic: "someText1", status: "0", action: "1", comment: "someComment1" }, // values of Map
value2 = { topic: "someText2", status: "0", action: "0", comment: "someComment2" },
value3 = { topic: "someText3", status: "1", action: "1", comment: "someComment3" };

Point 2: populating Map
// key of map is concatenation of various attributes from web page, separated by |

map.set('release|attachment|license1|topic1', value1);
map.set('release|attachment|license1|topic2', value1);
map.set('release1|attachment1|license1|topic1', value1);
map.set('release1|attachment1|license2|topic2', value2);
map.set('release1|attachment1|license3|topic3', value3);
map.set('release2|attachment2|license2|topic2', value2);
map.set('release2|attachment2|license2|topic3', value2);

Point 3: iterating map and populating jsonObject

for (const [key, values] of map) {
    setPath(jsonObject, key.split('|'), values);
}
function setPath(obj, [...keys], item) {
    keys.pop(); // removing topic
    const last = keys.pop();
    keys.reduce((r, a) => r[a] = r[a] || {}, obj)[last] =  [item];
}

Point 4: current output [ console.log(JSON.stringify(jsonObject)); ]

{
  "release": {
    "attachment": {
      "license1": [
        {
          "topic": "someText2",
          "status": "0",
          "action": "0",
          "comment": "someComment2"
        }
      ]
    }
  },
  "release1": {
    "attachment1": {
      "license1": [
        {
          "topic": "someText1",
          "status": "0",
          "action": "1",
          "comment": "someComment1"
        }
      ],
      "license2": [
        {
          "topic": "someText2",
          "status": "0",
          "action": "0",
          "comment": "someComment2"
        }
      ],
      "license3": [
        {
          "topic": "someText3",
          "status": "1",
          "action": "1",
          "comment": "someComment3"
        }
      ]
    }
  },
  "release2": {
    "attachment2": {
      "license2": [
        {
          "topic": "someText3",
          "status": "1",
          "action": "1",
          "comment": "someComment3"
        }
      ]
    }
  }
}

Point 5: expected output (jsonObject)

{
  "release": {
    "attachment": {
      "license1": [
        {
          "topic": "someText1", // ^^ This object is missing in current output.
          "status": "0",
          "action": "1",
          "comment": "someComment1"
        },
        {
          "topic": "someText2",
          "status": "0",
          "action": "0",
          "comment": "someComment2"
        }
      ]
    }
  },
  "release1": {
    "attachment1": {
      "license1": [
        {
          "topic": "someText1",
          "status": "0",
          "action": "1",
          "comment": "someComment1"
        }
      ],
      "license2": [
        {
          "topic": "someText2",
          "status": "0",
          "action": "0",
          "comment": "someComment2"
        }
      ],
      "license3": [
        {
          "topic": "someText3",
          "status": "1",
          "action": "1",
          "comment": "someComment3"
        }
      ]
    }
  },
  "release2": {
    "attachment2": {
      "license2": [
        {
          "topic": "someText2", // ^^ This object is missing in current output.
          "status": "0",
          "action": "0",
          "comment": "someComment2"
        },
        {
          "topic": "someText3",
          "status": "1",
          "action": "1",
          "comment": "someComment3"
        }
      ]
    }
  }
}

^^ I want to have array of objects in jsonObject .

Can someone help me with tweak needs to be done in setPath function in Point 3 to obtain expected result?

PS: I know that I have asked similar question here .

Answer 1

You are overwriting the license arrays instead of just appending the new items.

Change this line

keys.reduce((r, a) => r[a] = r[a] || {}, obj)[last] =  [item];

to this

const target = keys.reduce((r, a) => r[a] = r[a] || {}, obj);
(target[last] = target[last] || []).push(item);