{ "schema_version": 2, "id": "commands/llen", "title": "LLEN", "url": "https://redis.io/docs/latest/commands/llen/", "summary": "Returns the length of a list.", "since": "1.0.0", "tags": [ "docs", "develop", "stack", "oss", "rs", "rc", "oss", "kubernetes", "clients" ], "last_updated": "2026-07-08T12:05:04+02:00", "page_type": "content", "content_hash": "8dfc5414cffc25f49acfc64f069d792786476e250231b3de58aa18249ceab354", "sections": [ { "id": "required-arguments", "title": "Required arguments", "role": "content", "text": "
key\n\nThe name of the key that holds the list.\n\n
" }, { "id": "examples", "title": "Examples", "role": "example", "text": "Foundational: Get the length of a list using LLEN (returns 0 if key doesn't exist, useful for checking list size)\n\n**Difficulty:** Beginner\n\n**Commands:** LPUSH, LLEN\n\n**Complexity:**\n- LPUSH: O(1)\n- LLEN: O(1)\n\n**Available in:** Redis CLI, C#, Go, Java (Asynchronous - Lettuce), Java (Reactive - Lettuce), Java (Synchronous - Jedis), JavaScript (Node.js), JavaScript (Node.js), PHP, Python, Ruby, Rust (Asynchronous), Rust (Synchronous)\n\n##### Redis CLI\n\n[code example]\n\n##### C#\n\n[code example]\n\n##### Go\n\n[code example]\n\n##### Java (Asynchronous - Lettuce)\n\n[code example]\n\n##### Java (Reactive - Lettuce)\n\n[code example]\n\n##### Java (Synchronous - Jedis)\n\n[code example]\n\n##### JavaScript (Node.js)\n\n[code example]\n\n##### JavaScript (Node.js)\n\n[code example]\n\n##### JavaScript (Node.js)\n\n[code example]\n\n##### JavaScript (Node.js)\n\n[code example]\n\n##### PHP\n\n[code example]\n\n##### Python\n\n[code example]\n\n##### Ruby\n\n[code example]\n\n##### Rust (Asynchronous)\n\n[code example]\n\n##### Rust (Synchronous)\n\n[code example]" }, { "id": "redis-software-and-redis-cloud-compatibility", "title": "Redis Software and Redis Cloud compatibility", "role": "content", "text": "| Redis
Software | Redis
Cloud | Notes |\n|:----------------------|:-----------------|:------|\n| ✅ Standard
✅ Active-Active | ✅ Standard
✅ Active-Active | |" }, { "id": "return-information", "title": "Return information", "role": "returns", "text": "**RESP2:**\n\n[Integer reply](../../develop/reference/protocol-spec#integers): the length of the list.\n\n**RESP3:**\n\n[Integer reply](../../develop/reference/protocol-spec#integers): the length of the list." } ], "examples": [ { "id": "examples-ex0", "language": "plaintext", "code": "redis> LPUSH mylist \"World\"\n(integer) 1\nredis> LPUSH mylist \"Hello\"\n(integer) 2\nredis> LLEN mylist\n(integer) 2", "section_id": "examples" }, { "id": "examples-ex1", "language": "csharp", "code": "long lLenResult1 = db.ListLeftPush(\"mylist\", \"World\");\n Console.WriteLine(lLenResult1); // >>> 1\n\n long lLenResult2 = db.ListLeftPush(\"mylist\", \"Hello\");\n Console.WriteLine(lLenResult2); // >>> 2\n\n long lLenResult3 = db.ListLength(\"mylist\");\n Console.WriteLine(lLenResult3); // >>> 2", "section_id": "examples" }, { "id": "examples-ex2", "language": "go", "code": "lPushResult1, err := rdb.LPush(ctx, \"mylist\", \"World\").Result()\n\n\tif err != nil {\n\t\tpanic(err)\n\t}\n\n\tfmt.Println(lPushResult1) // >>> 1\n\n\tlPushResult2, err := rdb.LPush(ctx, \"mylist\", \"Hello\").Result()\n\n\tif err != nil {\n\t\tpanic(err)\n\t}\n\n\tfmt.Println(lPushResult2) // >>> 2\n\n\tlLenResult, err := rdb.LLen(ctx, \"mylist\").Result()\n\n\tif err != nil {\n\t\tpanic(err)\n\t}\n\n\tfmt.Println(lLenResult) // >>> 2", "section_id": "examples" }, { "id": "examples-ex3", "language": "java", "code": "CompletableFuture llen = asyncCommands.lpush(\"mylist\", \"World\").thenCompose(res11 -> {\n System.out.println(res11); // >>> 1\n\n return asyncCommands.lpush(\"mylist\", \"Hello\");\n }).thenCompose(res12 -> {\n System.out.println(res12); // >>> 2\n\n return asyncCommands.llen(\"mylist\");\n })\n .thenAccept(res13 -> System.out.println(res13)) // >>> 2\n .toCompletableFuture();", "section_id": "examples" }, { "id": "examples-ex4", "language": "java", "code": "Mono llen = reactiveCommands.lpush(\"mylist\", \"World\").doOnNext(res11 -> {\n System.out.println(res11); // >>> 1\n }).flatMap(res11 -> reactiveCommands.lpush(\"mylist\", \"Hello\")).doOnNext(res12 -> {\n System.out.println(res12); // >>> 2\n }).flatMap(res12 -> reactiveCommands.llen(\"mylist\")).doOnNext(res13 -> {\n System.out.println(res13); // >>> 2\n }).then();", "section_id": "examples" }, { "id": "examples-ex5", "language": "java", "code": "long lLenResult1 = jedis.lpush(\"mylist\", \"World\");\n System.out.println(lLenResult1); // >>> 1\n\n long lLenResult2 = jedis.lpush(\"mylist\", \"Hello\");\n System.out.println(lLenResult2); // >>> 2\n\n long lLenResult3 = jedis.llen(\"mylist\");\n System.out.println(lLenResult3); // >>> 2", "section_id": "examples" }, { "id": "examples-ex6", "language": "javascript", "code": "const res11 = await client.lPush('mylist', 'World');\nconsole.log(res11); // 1\n\nconst res12 = await client.lPush('mylist', 'Hello');\nconsole.log(res12); // 2\n\nconst res13 = await client.lLen('mylist');\nconsole.log(res13); // 2", "section_id": "examples" }, { "id": "examples-ex7", "language": "javascript", "code": "const res11 = await redis.lpush('mylist', 'World');\nconsole.log(res11); // >>> 1\n\nconst res12 = await redis.lpush('mylist', 'Hello');\nconsole.log(res12); // >>> 2\n\nconst res13 = await redis.llen('mylist');\nconsole.log(res13); // >>> 2", "section_id": "examples" }, { "id": "examples-ex8", "language": "javascript", "code": "const res11 = await client.lPush('mylist', 'World');\nconsole.log(res11); // 1\n\nconst res12 = await client.lPush('mylist', 'Hello');\nconsole.log(res12); // 2\n\nconst res13 = await client.lLen('mylist');\nconsole.log(res13); // 2", "section_id": "examples" }, { "id": "examples-ex9", "language": "javascript", "code": "const res11 = await redis.lpush('mylist', 'World');\nconsole.log(res11); // >>> 1\n\nconst res12 = await redis.lpush('mylist', 'Hello');\nconsole.log(res12); // >>> 2\n\nconst res13 = await redis.llen('mylist');\nconsole.log(res13); // >>> 2", "section_id": "examples" }, { "id": "examples-ex10", "language": "php", "code": "$res11 = $r->lpush('mylist', 'World');\n echo $res11 . PHP_EOL;\n // >>> 1\n\n $res12 = $r->lpush('mylist', 'Hello');\n echo $res12 . PHP_EOL;\n // >>> 2\n\n $res13 = $r->llen('mylist');\n echo $res13 . PHP_EOL;\n // >>> 2", "section_id": "examples" }, { "id": "examples-ex11", "language": "python", "code": "res11 = r.lpush(\"mylist\", \"World\")\nprint(res11) # >>> 1\n\nres12 = r.lpush(\"mylist\", \"Hello\")\nprint(res12) # >>> 2\n\nres13 = r.llen(\"mylist\")\nprint(res13) # >>> 2", "section_id": "examples" }, { "id": "examples-ex12", "language": "ruby", "code": "res11 = r.lpush('mylist', 'World')\nputs res11 # >>> 1\n\nres12 = r.lpush('mylist', 'Hello')\nputs res12 # >>> 2\n\nres13 = r.llen('mylist')\nputs res13 # >>> 2", "section_id": "examples" }, { "id": "examples-ex13", "language": "rust", "code": "if let Ok(res11) = r.lpush(\"mylist\", \"World\").await {\n let res11: i32 = res11;\n println!(\"{res11}\"); // >>> 1\n }\n\n if let Ok(res12) = r.lpush(\"mylist\", \"Hello\").await {\n let res12: i32 = res12;\n println!(\"{res12}\"); // >>> 2\n }\n\n if let Ok(res13) = r.llen(\"mylist\").await {\n let res13: i32 = res13;\n println!(\"{res13}\"); // >>> 2\n }", "section_id": "examples" }, { "id": "examples-ex14", "language": "rust", "code": "if let Ok(res11) = r.lpush(\"mylist\", \"World\") {\n let res11: i32 = res11;\n println!(\"{res11}\"); // >>> 1\n }\n\n if let Ok(res12) = r.lpush(\"mylist\", \"Hello\") {\n let res12: i32 = res12;\n println!(\"{res12}\"); // >>> 2\n }\n\n if let Ok(res13) = r.llen(\"mylist\") {\n let res13: i32 = res13;\n println!(\"{res13}\"); // >>> 2\n }", "section_id": "examples" } ] }