---
acl_categories:
- '@bloom'
- '@read'
- '@slow'
arguments:
- name: key
  type: key
- multiple: true
  name: item
  type: string
categories:
- docs
- develop
- stack
- oss
- rs
- rc
- oss
- kubernetes
- clients
complexity: O(k * n), where k is the number of hash functions and n is the number
  of items
description: Checks whether one or more items exist in a Bloom Filter
group: bf
hidden: false
linkTitle: BF.MEXISTS
module: Bloom
railroad_diagram: /images/railroad/bf.mexists.svg
since: 1.0.0
stack_path: docs/data-types/probabilistic
summary: Checks whether one or more items exist in a Bloom Filter
syntax_fmt: BF.MEXISTS key item [item ...]
title: BF.MEXISTS
---
Determines whether one or more items were added to a Bloom filter.

This command is similar to [`BF.EXISTS`]({{< relref "commands/bf.exists/" >}}), except that more than one item can be checked.

## Required arguments

<details open><summary><code>key</code></summary>

is key name for a Bloom filter.

</details>

<details open><summary><code>item...</code></summary>

One or more items to check.
</details>

## Examples

{{< highlight bash >}}
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
{{< / highlight >}}

## Redis Software and Redis Cloud compatibility

| Redis<br />Software | Redis<br />Cloud | <span style="min-width: 9em; display: table-cell">Notes</span> |
|:----------------------|:-----------------|:------|
| <span title="Supported">&#x2705; Supported</span><br /> | <span title="Supported">&#x2705; Flexible & Annual</span><br /><span title="Supported">&#x2705; Free & Fixed</nobr></span> |  |

## Return information

{{< multitabs id="bf-mexists-return-info" 
    tab1="RESP2" 
    tab2="RESP3" >}}

One of the following:
* [Array reply]({{< relref "/develop/reference/protocol-spec#arrays" >}}) of [integer replies]({{< relref "/develop/reference/protocol-spec#integers" >}}), 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.
* [Simple error reply]({{< relref "/develop/reference/protocol-spec#simple-errors" >}}) in these cases: in these cases: invalid arguments, wrong key type, or when the key was not found.

-tab-sep-

One of the following:
* [Array reply]({{< relref "/develop/reference/protocol-spec#arrays" >}}) of [boolean replies]({{< relref "/develop/reference/protocol-spec#booleans" >}}), where `true` means that, with high probability, `item` was already added to the filter, and `false` means that `key` does not exist or that `item` was definitely not added to the filter.
* [Simple error reply]({{< relref "/develop/reference/protocol-spec#simple-errors" >}}) in these cases: in these cases: invalid arguments, wrong key type, or when the key was not found.

{{< /multitabs >}}