STRLEN key

Available since: 2.2.0

Time complexity: O(1)

ACL categories: @read @string @fast

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

Return

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

redis:6379> SET mykey "Hello world"
Failed to fetch
redis:6379> STRLEN mykey
Failed to fetch
redis:6379> STRLEN nonexisting
Failed to fetch

redis:6379>