get-all-keys-recursively.coffee

input =
  a:
    b: 'one'
    d: 'two'
    f: g: 'three'
  bb: 'four'
  dd: 'five'
  gg:
    jj: 'six'
    as: 'seven'
    dfh: wsg: seg: wet:
      ger: 'eight'
      hhh: 'nine'

do goDeeper = (obj = input, prevKey = '') ->
  for key, val of obj
    currKey = "#{prevKey}#{key}"
    switch typeof val
      when 'string'
        console.log currKey
      when 'object'
        goDeeper val, "#{currKey}."
  return

###
'a.b',
'a.d',
'a.f.g',
'bb',
'dd',
'gg.jj',
'gg.as',
'gg.dfh.wsg.seg.wet.ger',
'gg.dfh.wsg.seg.wet.hhh'
###

The same in python3

def get_keys(obj):
    result = []

    def go_deeper(obj, prev_key=''):
        for key, val in obj.items():
            curr_key = prev_key + key
            if isinstance(val, str):
                result.append(curr_key)
            elif isinstance(val, dict):
                go_deeper(val, curr_key + '.')
    go_deeper(obj)
    return result