BF.MADD 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

Adds one or more items to the Bloom Filter and creates the filter if it does not exist yet. This command operates identically to BF.ADD except that it allows multiple inputs and returns multiple values.


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


[] - for each item which is either "1" or "0" depending on whether the corresponding input element was newly added to the filter or may have previously existed.


redis> BF.MADD bf item1 item2
1) (integer) 0
2) (integer) 1