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Use XLEN to get the number of entries currently in a stream. Deleted and trimmed entries are not counted, and the reply is 0 when the key does not exist. The number reflects what is stored right now, not how many entries the stream has ever carried, so it is a measure of retained data rather than of throughput; a group’s backlog is reported by the lag in XINFO GROUPS.

Syntax

Arguments

Response

The reply reports the result of the operation. Error replies have the same shape in RESP2 and RESP3 and are surfaced as exceptions by the SDKs below.
Client libraries often decode bulk strings, maps, sets, and numeric strings into language-native values. The table describes the Redis wire reply.

Examples

TCP examples use the TLS REDIS_URL from the Upstash console. REST examples use UPSTASH_REDIS_REST_URL and UPSTASH_REDIS_REST_TOKEN.

Related topics

XLENOverview