# WhitelistFilter **`class WhitelistFilter(config)`** Bases: [`Filter`](squirro.lib.nlp.steps.filters.Filter.md#squirro.lib.nlp.steps.filters.Filter) The whitelist [`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 be skip based on a whitelist **Input** - all input fields need to be of type [`str`](https://docs.python.org/3.11/library/stdtypes.html#str) or [`list`](https://docs.python.org/3.11/library/stdtypes.html#list) [ [`str`](https://docs.python.org/3.11/library/stdtypes.html#str) ]. **Output** - No output 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)) – whitelist - `replacements` ([`dict`](https://docs.python.org/3.11/library/stdtypes.html#dict)`, ``{}`) – Dictionary of replacement values for non-whitelisted field values - `whitelists` ([`dict`](https://docs.python.org/3.11/library/stdtypes.html#dict)) – Dictionary of fields to apply the whitelisting, each with a list of whitelisted values - `is_unique` ([`bool`](https://docs.python.org/3.11/library/functions.html#bool)`, ``True`) – Whether values are unique or not **Example** ```json { "step": "filter", "type": "whitelist", "whitelists":{"body":["the","body","whitelists"]} } ``` 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)