{
  "schema_version": 2,
  "id": "commands/bf.exists",
  "title": "BF.EXISTS",
  "url": "https://redis.io/docs/latest/commands/bf.exists/",
  "summary": "Checks whether an item exists in a Bloom Filter",
  "since": "1.0.0",
  "tags": [
    "docs",
    "develop",
    "stack",
    "oss",
    "rs",
    "rc",
    "oss",
    "kubernetes",
    "clients"
  ],
  "last_updated": "2026-09-18T09:48:54+01:00",
  "page_type": "content",
  "content_hash": "2be66e5f4b802806211e2cfde0cda4357188d05265246559c45997a5bea436f8",
  "sections": [
    {
      "id": "overview",
      "title": "Overview",
      "role": "overview",
      "text": "Determines whether a given item was added to a Bloom filter.\n\nThis command is similar to [`BF.MEXISTS`](https://redis.io/docs/latest/commands/bf.mexists), except that only one item can be checked."
    },
    {
      "id": "required-arguments",
      "title": "Required arguments",
      "role": "content",
      "text": "<details open><summary><code>key</code></summary>\n\nis key name for a Bloom filter.\n\n</details>\n\n<details open><summary><code>item</code></summary>\n\nis an item to check.\n</details>"
    },
    {
      "id": "examples",
      "title": "Examples",
      "role": "example",
      "text": "redis> BF.ADD bf item1\n(integer) 1\nredis> BF.EXISTS bf item1\n(integer) 1\nredis> BF.EXISTS bf item2\n(integer) 0"
    },
    {
      "id": "redis-software-and-redis-cloud-compatibility",
      "title": "Redis Software and Redis Cloud compatibility",
      "role": "content",
      "text": "| Redis<br />Software | Redis<br />Cloud | <span style=\"min-width: 9em; display: table-cell\">Notes</span> |\n|:----------------------|:-----------------|:------|\n| <span title=\"Supported\">&#x2705; Supported</span><br /> | <span title=\"Supported\">&#x2705; Flexible & Annual</span><br /><span title=\"Supported\">&#x2705; Free & Fixed</nobr></span> |  |"
    },
    {
      "id": "return-information",
      "title": "Return information",
      "role": "returns",
      "text": "**RESP2:**\n\nOne of the following:\n* [Integer reply](https://redis.io/docs/latest/develop/reference/protocol-spec#integers), where a value of `1` means the item was probably already added to the filter. A value of `0` means the item was definitely not added, `key` does not exist, or `key` contains a value of the wrong type.\n* [Simple error reply](https://redis.io/docs/latest/develop/reference/protocol-spec#simple-errors) if invalid arguments are passed.\n\n**RESP3:**\n\nOne of the following:\n* [Boolean reply](https://redis.io/docs/latest/develop/reference/protocol-spec#booleans), where a value of `true` means the item was probably already added to the filter. A value of `false` means the item was definitely not added, `key` does not exist, or `key` contains a value of the wrong type.\n* [Simple error reply](https://redis.io/docs/latest/develop/reference/protocol-spec#simple-errors) if invalid arguments are passed."
    }
  ],
  "examples": []
}