# CharacterNormalizer **`class CharacterNormalizer(config)`** Bases: [`Normalizer`](squirro.lib.nlp.steps.normalizers.Normalizer.md#squirro.lib.nlp.steps.normalizers.Normalizer) The character [`Normalizer`](squirro.lib.nlp.steps.normalizers.Normalizer.md#squirro.lib.nlp.steps.normalizers.Normalizer) removes numeric digits **Input** - all input fields need to be of type [`str`](https://docs.python.org/3.11/library/stdtypes.html#str) or `list`[:class:`str`]. **Output** - all output fields are filled with data of type [`str`](https://docs.python.org/3.11/library/stdtypes.html#str) respectively `list`[:class:`str`]. Parameters `type` ([`str`](https://docs.python.org/3.11/library/stdtypes.html#str)) – character **Example** ```json { "step": "normalizer", "type": "character", "input_fields": ["body"], "output_fields": ["normalized_body"] } ``` Methods SummaryMethods Documentation **`process_doc(doc)`** Process a document Parameters `doc` ([`Document`](../technical/libnlp/base.md#squirro.lib.nlp.document.Document)) – Document Returns Processed document Return type [Document](../technical/libnlp/base.md#squirro.lib.nlp.document.Document)