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Use HLEN to get the number of fields in a hash. The reply is 0 when the key does not exist. The count is kept by Redis rather than computed, so it is cheap whatever the size of the hash, which makes it the right way to check how big a hash has grown before deciding to read or iterate it.

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

HLENOverview