Flatten and given java script object.

FlattenJavascriptObject.js

function flatten(originalObject, newObj, keyNamePrefix) {
  if (newObj == undefined) {
    newObj = {};
  }
  if (typeof originalObject == 'object') {
    for (key in originalObject) {
      if (typeof originalObject[key] == 'object') {
        let item = originalObject[key];
        if (keyNamePrefix == undefined) {
          flatten(item, newObj, key);
        } else {
          flatten(item, newObj, keyNamePrefix + "."+ key);
        }
      } else {
        if (keyNamePrefix == undefined) {
          newObj[key] = originalObject[key];
        } else {
          newObj[keyNamePrefix + '.' + key] = originalObject[key];
        }
      }
    }
  }
  return newObj;
}

Convert

{
  "a": "abc",
  "b": {
    "b1": "bcd",
    "b2": {
      "b21": "ccccc",
      "b22": "ccccc"
    }
  },
  "c": [
    {
      "c1": "cde"
    },
    {
      "c1": "def"
    }
  ]
}

to

{
  "a": "abc",
  "b.b1": "bcd",
  "b.b2.b21": "ccccc",
  "b.b2.b22": "ccccc",
  "c.0.c1": "cde",
  "c.1.c1": "def"
}