SET

The key

The value, if this is not a string, we will use JSON.stringify to convert it to a string.

Instead of returning True, this will cause the command to return the old value stored at key, or None when key did not exist.

Sets an expiration (in seconds) to the key.

Sets an expiration (in milliseconds) to the key.

Set the UNIX timestamp in seconds until the key expires.

Set the UNIX timestamp in milliseconds until the key expires.

Keeps the old expiration if the key already exists.

Only set the key if it does not already exist.

Only set the key if it already exists.