Rsa97

for (var section in data) {
  for (var key in data[section]) {
    ...
  }
}

const arr1 = [1, 2, 3]
const arr2 = [2, 3]
const arrSub = arr1.filter(el => !arr2.includes(el))
console.log(arrSub)
// [1]

const kind = data.features[0].properties.GeocodeMetaData.Address.Components
  .find(el => el.kind === 'locality')
const locality = (kind === undefined ? '' : kind.name)

$('#contact-form').on('submit', function (e) {
  e.preventDefault()
  ...
})