Memory

The memory driver uses a Map and is the default for createStorage(). Data is not shared between processes and is lost when the process exits or the storage is disposed.

import { createStorage } from "unstorage";

const storage = createStorage();

You can also create the driver explicitly:

import { createStorage } from "unstorage";
import memoryDriver from "unstorage/drivers/memory";

const driver = memoryDriver();
const storage = createStorage({ driver });

const map = driver.getInstance?.();

#TTL

Pass a TTL in seconds when setting an item:

await storage.setItem("session:1", { userId: 1 }, { ttl: 60 });

The driver removes the item after the TTL expires. Calling clear() or dispose() also cancels pending expiration timers.

Use this driver for tests, short-lived caches, and local defaults—not for durable or distributed data.