HLEN key

Available since 2.0.0.

Time complexity: O(1)

Returns the number of fields contained in the hash stored at key.

*Return value

Integer reply: number of fields in the hash, or 0 when key does not exist.

*Examples

redis> HSET myhash field1 "Hello" 

  1. (integer) 1

redis> HSET myhash field2 "World" 

  1. (integer) 1

redis> HLEN myhash 

  1. (integer) 2
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