upstash-redis-js

Install @upstash/redis and initialize with Redis.fromEnv() after setting UPSTASH_REDIS_REST_URL and UPSTASH_REDIS_REST_TOKEN. The SDK communicates over HTTP, so no TCP connection management is needed in serverless functions.

Replace the ioredis import with Redis from @upstash/redis, switch host/port config to a REST URL and token, and remove JSON.stringify/parse calls since serialization is automatic. Update command syntax such as zadd(key, { score, member }) and set options like { ex: 3600 }.

Yes, @upstash/redis automatically serializes and deserializes numbers, booleans, objects, and arrays, so redis.set('user', { name: 'Alice' }) returns a parsed object on get. Dates become ISO strings and class instances lose their prototypes.

Use a simple INCR with EXPIRE for fixed-window limiting, a sorted set for sliding windows, or the @upstash/ratelimit package for production-grade fixed window, sliding window, and token bucket algorithms.

Upstash Redis Search is a separate extension accessed via redis.search with a schema builder, supporting querying, filtering, and aggregations over JSON, string, or hash data. Data is upserted with regular Redis commands, and waitIndexing() must be called before querying.

Index updates are batched, so newly written documents may not appear immediately in search results. Call index.waitIndexing() once after your batch of upserts to block until all pending documents are processed.