{
  "schema_version": 2,
  "id": "commands/sismember",
  "title": "SISMEMBER",
  "url": "https://redis.io/docs/latest/commands/sismember/",
  "summary": "Determines whether a member belongs to a set.",
  "since": "1.0.0",
  "tags": [
    "docs",
    "develop",
    "stack",
    "oss",
    "rs",
    "rc",
    "oss",
    "kubernetes",
    "clients"
  ],
  "last_updated": "2026-07-24T11:07:00+02:00",
  "page_type": "content",
  "content_hash": "1ae44a94e26d9eb763c2784b0c26d70b24857135586e0218bf525777bacc1400",
  "sections": [
    {
      "id": "overview",
      "title": "Overview",
      "role": "overview",
      "text": "Returns if `member` is a member of the set stored at `key`."
    },
    {
      "id": "required-arguments",
      "title": "Required arguments",
      "role": "content",
      "text": "<details open><summary><code>key</code></summary>\n\nThe name of the key that holds the set.\n\n</details>\n\n<details open><summary><code>member</code></summary>\n\nThe member to check for.\n\n</details>"
    },
    {
      "id": "examples",
      "title": "Examples",
      "role": "example",
      "text": "redis> SADD myset \"one\"\n(integer) 1\nredis> SISMEMBER myset \"one\"\n(integer) 1\nredis> SISMEMBER myset \"two\"\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; Standard</span><br /><span title=\"Supported\"><nobr>&#x2705; Active-Active</nobr></span> | <span title=\"Supported\">&#x2705; Standard</span><br /><span title=\"Supported\"><nobr>&#x2705; Active-Active</nobr></span> |  |"
    },
    {
      "id": "return-information",
      "title": "Return information",
      "role": "returns",
      "text": "**RESP2:**\n\nOne of the following:\n* [Integer reply](../../develop/reference/protocol-spec#integers): `0` if the element is not a member of the set, or when the key does not exist.\n* [Integer reply](../../develop/reference/protocol-spec#integers): `1` if the element is a member of the set.\n\n**RESP3:**\n\nOne of the following:\n* [Integer reply](../../develop/reference/protocol-spec#integers): `0` if the element is not a member of the set, or when the key does not exist.\n* [Integer reply](../../develop/reference/protocol-spec#integers): `1` if the element is a member of the set."
    }
  ],
  "examples": []
}