STRLEN key

Available since 2.2.0.

Time complexity: O(1)

Returns the length of the string value stored at key. An error is returned when key holds a non-string value.

*Return value

Integer reply: the length of the string at key, or 0 when key does not exist.

*Examples

redis>  SET mykey "Hello world" 
"OK"
redis>  STRLEN mykey 
(integer) 11
redis>  STRLEN nonexisting 
(integer) 0
redis>