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" 

  1. "OK"

redis> STRLEN mykey 

  1. (integer) 11

redis> STRLEN nonexisting 

  1. (integer) 0
redis>