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Use MSETNX to set several keys at once, but only if none of them already exists. The command is all or nothing: if even a single key is present, nothing is written and the reply is 0; otherwise every key is written and the reply is 1. Since the check and the writes are one atomic step, it can be used to claim a whole group of related keys, so that a partially initialized state can never be observed.

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

MSETNXOverview