BF.MEXISTS key item [item ...]

Available in: Redis Stack

Time complexity: O(k * n), where k is the number of hash functions and n is the number of items

Determines if one or more items may exist in the filter or not.


  • key: The name of the filter
  • items: One or more items to check


[] - for each item where "1" value means the corresponding item may exist in the filter, and a "0" value means it does not exist in the filter.


redis> BF.MEXISTS bf item1 item_new
1) (integer) 1
2) (integer) 0