# Filtering Collections

Collections can be filtered with the filter query parameter. The filter parameter supports standard comparison operations, such as `<=,>=,!=,=,>,<` .

When multiple parameters are specified, the conditions are ANDed together. Multiple filters in an API request will need to be separated by a comma. Not all API endpoints accept the same Filtering collections, so to refer to each endpoint's documentation for specific details.

Example:
`https://fetch.yellowdogsoftware.com/api/v3/purchaseOrders?Filter=docNumber='12345',lastUpdated>=’2016-11-17’`