> ## Documentation Index
> Fetch the complete documentation index at: https://upstash.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# TTL

> Return the expiration in seconds of a key.

## Arguments

<ParamField body="key" type="string" required>
  The key
</ParamField>

## Response

<ResponseField type="integer" required>
  The number of seconds until this expires, negative if the key does not exist or does not have an expiration set.
</ResponseField>

<RequestExample>
  ```ts Example theme={"system"}
  const seconds = await redis.ttl(key);
  ```
</RequestExample>


## Related topics

- [TTL](/docs/redis/sdks/py/commands/generic/ttl.md)
- [Redis® API Compatibility: supported commands, modules, and protocols](/docs/redis/overall/compatibility.md)
- [Memory, Chat History, RAG, Rate Limiting & Sandboxes for the Vercel Eve Agent Framework](/docs/redis/sdks/agentkit/eve.md)
- [Agent Memory with Redis Search](/docs/redis/tutorials/agent_memory.md)
- [Vercel AI SDK Memory, RAG & Chat History with Redis](/docs/redis/sdks/agentkit/ai-sdk.md)