BF.MEXISTS key item [item ...]
Available in:
Redis Stack / Bloom 1.0.0
Time complexity:
O(k * n), where k is the number of hash functions and n is the number of items

Determines whether one or more items were added to a Bloom filter.

This command is similar to BF.EXISTS, except that more than one item can be checked.

Required arguments


is key name for a Bloom filter.


One or more items to check.

Return value

Returns one of these replies:

  • Array reply of Integer reply - where "1" means that, with high probability, item was already added to the filter, and "0" means that key does not exist or that item was definitely not added to the filter.
  • [] on error (invalid arguments, wrong key type, etc.)


redis> BF.MADD bf item1 item2
1) (integer) 1
2) (integer) 1
redis> BF.MEXISTS bf item1 item2 item3
1) (integer) 1
2) (integer) 1
3) (integer) 0

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