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HLEN

Last updated 
HLEN key
Group
Hash
Complexity
O(1)
Arity
2 (exactly, counting the command name)
Flags
read-only, fast
Keys
first 1, last 1, step 1
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HLEN returns how many fields the hash stored at key holds.

Return value

Section titled “Return value”
Case RESP2 RESP3
Hash exists Integer: the number of fields Same
Key does not exist Integer 0 Same

HLEN replies with a WRONGTYPE error if key holds a value that is not a hash.

Examples

Section titled “Examples”
127.0.0.1:6379> HSET user:1 name "Ada" lang "en"
(integer) 2
127.0.0.1:6379> HLEN user:1
(integer) 2
127.0.0.1:6379> HLEN nosuchkey
(integer) 0

Compatibility

Section titled “Compatibility”

Same as Redis 7.4 and Valkey 8.

See also

Section titled “See also”

HKEYS, HVALS, HSTRLEN, HGETALL