Convert js object to DRF nested ( {key1: {key2: value}} => key1.key2: value )

nestes.js

//let formData = new FormData()
//nested object {key1: {key2: value}} => key1.key2: value
_buildDotObject(formData, obj, stack) {
  for (let property in obj) {
    if (obj.hasOwnProperty(property)) {
      if (typeof obj[property] === "object") {
        this._buildDotObject(formData, obj[property], stack ? (stack + '.' + property): property);
      } else {
        formData.append(stack + '.' + property, obj[property]);
      }
    }
  }
}