import json
 
def RawJSONDecoder(index):
    class _RawJSONDecoder(json.JSONDecoder):
        end = None
 
        def decode(self, s, *_):
            data, self.__class__.end = self.raw_decode(s, index)
            return data
    return _RawJSONDecoder
 
def extract_json(s, index=0):
    while (index := s.find('{', index)) != -1:
        try:
            yield json.loads(s, cls=(decoder := RawJSONDecoder(index)))
            index = decoder.end
        except json.JSONDecodeError:
            index += 1
 
s = '''...some {{bad brackets} and empty brackets {} <= still valid JSON though...
 
{
   "1":"one",
   "2":"two",
   "3":{
      "31":{
         "311":"threeoneone",
         "312":"threeonetwo",
         "313":"threeonethree"
      }
   },
   "4":{
      "41":"fourone",
      "42":"fourtwo",
      "43":"fourthree"
   },
   "5":"five",
   "6":"six"
}
 
...some more random text...'''
print(*extract_json(s), sep='\n')

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