XLEN key

Time complexity: O(1)

Returns the number of entries inside a stream. If the specified key does not exist the command returns zero, as if the stream was empty. However note that unlike other Redis types, zero-length streams are possible, so you should call TYPE or in order to check if a key exists or not.

Integer reply: the number of entries of the stream at .

*Examples

redis> XADD mystream * item 1

redis> XADD mystream * item 3

redis> XLEN mystream