BF.EXISTS key item
Available in:
Redis Stack / Bloom 1.0.0
Time complexity:
O(k), where k is the number of hash functions used by the last sub-filter

Determines whether a given item was added to a Bloom filter.

This command is similar to BF.MEXISTS, except that only one item can be checked.

Required arguments


is key name for a Bloom filter.


is an item to check.

Return value

Returns one of these replies:

  • 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 had not been added to the filter.
  • [] on error (invalid arguments, wrong key type, etc.)


redis> BF.ADD bf item1
(integer) 1
redis> BF.EXISTS bf item1
(integer) 1
redis> BF.EXISTS bf item2
(integer) 0

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