ExistsCommand: Contents
EXISTS _key_
Return value

# ExistsCommand

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# EXISTS _key_

Time complexity: O(1)

> Test if the specified key exists. The command returns"0" if the key exists, otherwise "1" is returned.Note that even keys set with an empty string as value willreturn "1".

## Return value

Integer reply, specifically:

    1 if the key exists.
    0 if the key does not exist.