LLEN key
Returns the length of the list stored at key. If key does not exist, it is interpreted as an empty list and 0 is returned. An error is returned when the value stored at key is not a list.
Integer reply: the length of the list at key.
(integer) 1 redis> LPUSH mylist "Hello" (integer) 2 redis> LLEN mylist (integer) 2
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https://redis.io/commands/llen