# EmptyFilter **`class EmptyFilter(config)`** Bases: [`Filter`](squirro.lib.nlp.steps.filters.Filter.md#squirro.lib.nlp.steps.filters.Filter) The empty [`Filter`](squirro.lib.nlp.steps.filters.Filter.md#squirro.lib.nlp.steps.filters.Filter) removes a [`Document`](../technical/libnlp/base.md#squirro.lib.nlp.document.Document) or marks a [`Document`](../technical/libnlp/base.md#squirro.lib.nlp.document.Document) to skip based on empty fields **Input** - No specific input type necessary as long as it returns True/False for `if not field_name`. **Output** - No specific output format due to removal or marking to skip of the whole [`Document`](../technical/libnlp/base.md#squirro.lib.nlp.document.Document) Parameters - `type` ([`str`](https://docs.python.org/3.11/library/stdtypes.html#str)) – empty - `field` ([`str`](https://docs.python.org/3.11/library/stdtypes.html#str)`, ``None`) – Field to filter, this option is here to support older scripts, as removing it would break them - `fields` ([`list`](https://docs.python.org/3.11/library/stdtypes.html#list)`, ``None`) – Fields to filter - `replacement_value` ([`object`](https://docs.python.org/3.11/library/functions.html#object)`, ``None`) – Value with which to replace an empty field - `skip` ([`bool`](https://docs.python.org/3.11/library/functions.html#bool)`, ``True`) – Whether or not to skip a doc with an empty field **Example** ```json { "step": "filter", "type": "empty", "fields":["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)