    def _json_to_instance(self, json_dict: JsonDict) -> Instance:
        """
        Expects JSON that looks like `{"sentence": "..."}`.
        Runs the underlying model, and adds the `"words"` to the output.
        """
        sentence = json_dict["sentence"]
        tokens = self._tokenizer.tokenize(sentence)
        return self._dataset_reader.text_to_instance(tokens)
Expects JSON that looks like `{"sentence": "..."}`.
Runs the underlying model, and adds the `"words"` to the output.
allennlp/predictors/sentence_tagger.py