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TypeScript ORM for Node.js based on Data Mapper, Unit of Work and Identity Map patterns. Supports MongoDB, MySQL, PostgreSQL and SQLite databases as well as usage with vanilla JavaScript.
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title: Using AsyncLocalStorage
:::info
Since v5 `AsyncLocalStorage` is used inside `RequestContext` helper so this section is no longer valid.
:::
In v4 and older versions, the `domain` api was used in the `RequestContext` helper. Since v4.0.3, we can use the new `AsyncLocalStorage` too, if we are on up-to-date node version:
```ts
const storage = new AsyncLocalStorage<EntityManager>();
const orm = await MikroORM.init({
context: () => storage.getStore(),
// ...
});
app.use((req, res, next) => {
storage.run(orm.em.fork({ useContext: true }), next);
});
```