TTL to read how much longer a key will live, in seconds.
The reply is -1 when the key exists but has no expiration and -2 when the key does not exist, so these two are never confused with a real remaining lifetime. Values are rounded to whole seconds; use PTTL for millisecond precision and EXPIRETIME when you want the absolute deadline rather than the time left.
Syntax
Arguments
Important points
- Negative integer replies are sentinel values, not durations or timestamps; see the response description for missing or persistent data.
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 TLSREDIS_URL from the Upstash console. REST examples use UPSTASH_REDIS_REST_URL and UPSTASH_REDIS_REST_TOKEN.
Redis CLI
Redis CLI
@upstash/redis
@upstash/redis
upstash_redis
upstash_redis
ioredis
ioredis
node-redis
node-redis
redis-py
redis-py
go-redis
go-redis
jedis
jedis
redis-rs
redis-rs