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HLEN

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

Syntax​

HLEN key

Details​

  • Available since: 2.0.0
  • Time complexity: O(1)
  • ACL categories: @read, @hash, @fast

Example​

Assume we have a hash called myhash with fields "field1", "field2", and "field3":

HSET myhash field1 "value1"
HSET myhash field2 "value2"
HSET myhash field3 "value3"

Now, let's retrieve the number of fields in myhash:

HLEN myhash

This will output:

(integer) 3

RESP2/RESP3 Reply​

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