TYPE key
Returns the string representation of the type of the value stored at key. The different types that can be returned are: string, list, set, zset and hash.
Simple string reply: type of key, or none when key does not exist.
"OK" redis> LPUSH key2 "value" (integer) 1 redis> SADD key3 "value" (integer) 1 redis> TYPE key1 "string" redis> TYPE key2 "list" redis> TYPE key3 "set"
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https://redis.io/commands/type