Getting the default Time To Live (TTL) in Redis using Node.js can be useful when managing data persistence. Redis doesn't have a built-in command to fetch the default TTL, but it's typically set at the application level.
In this example, we're setting a key-value pair in Redis with an expiration time of 10 seconds. We then retrieve the TTL of the key to ensure it's been set correctly.
Q: What happens if I try to get the TTL of a key that doesn't exist?
A: Redis will return -2 indicating that the key does not exist.
Q: What if the key exists but has no associated expire?
A: Redis will return -1 indicating that the key exists but has no associated expire.
Q: Can I change the TTL of a key after setting it?
A: Yes, you can use the EXPIRE command to modify the TTL of an existing key.