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Use JSON.ARRLEN to get the number of elements in the arrays a path selects. Without a path the root value is used. The reply is one length per match, with null for matches that are not arrays, so it doubles as a cheap way to check that a branch of the document really is an array before working on it.

Syntax

Arguments

Important points

  • Raw TCP examples pass JSON values as valid JSON text. Typed Upstash SDK helpers serialize native objects and values for you.
  • Paths beginning with $ use JSONPath and can match multiple values, so many JSON commands return an array of per-match results.

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.