Way to change a deep key (node) 's value in JSON using JSON.stringify's replacer function

replace-deep-key-value-json.js

// https://replit.com/@arihantverma1/JSON-stringify-deeply-nested-node-value-change?v=1

const util = require('util')

const data = {
  widgets: [
    {
      type: "performance",
      data: {
        progress_bars: [
          {
            merge_target: {
              id: "1",
              data: "one"
            },

          },
          {
            merge_target: {
              id: "2",
              data: "two"
            }
          }
        ]
      }
    }
  ]
}

const sliceData = {
  widgets: [
    {
      type: "performance",
      data: {
        progress_bars: [
          {
            merge_target: {
              id: "1",
              data: "hundred"
            }
          }
        ]
      }
    }
  ]
}

const sliceMergeData = findAllMergeIdsAndValues(sliceData)
var result = JSON.parse(findAndReplaceSliceMergeValues(data, sliceMergeData))

console.info(sliceMergeData)
console.log(util.inspect(result, false, null, true /* enable colors */))

function findAndReplaceSliceMergeValues(entireObj, slideMergeData) {
  return JSON.stringify(entireObj, (key, nestedValue) => {    
    if (key === 'merge_target') {
      const sliceDataSlice = slideMergeData.find(el => el.id === nestedValue.id)      
      const sliceDataValue = sliceDataSlice?.data
      return sliceDataSlice ?? nestedValue
    }

    return nestedValue
  });

};

function findAllMergeIdsAndValues(obj) {
  let arr = []

  JSON.stringify(obj, (key, value) => {
    if (key === "merge_target") {
      arr.push({ id: value.id, data: value.data })
    }

    return value
  })

  return arr
}