---
title: InMemoryCache
description: If you are deploying Hydrogen to a Node.
api_version: 2026-04
source_url:
  html: 'https://shopify.dev/docs/api/hydrogen/latest/utilities/caching/inmemorycache'
  md: >-
    https://shopify.dev/docs/api/hydrogen/latest/utilities/caching/inmemorycache.md
---

# InMemoryCache

**Caution:**

This utility should only be used when deploying Hydrogen to a Node.js environment. It should *not* be used when deploying Hydrogen to Oxygen.

If you are deploying Hydrogen to a Node.js environment, you can use this limited implementation of an in-memory cache. It only supports the `cache-control` header. It does NOT support `age` or `expires` headers.

Learn more about [data fetching in Hydrogen](https://shopify.dev/docs/custom-storefronts/hydrogen/data-fetching/fetch-data).

Examples

### Examples

* ####

  ##### JavaScript

  ```js
  const {createRequestHandler} = require('react-router');
  const path = require('path');
  const {installGlobals} = require('react-router');
  const express = require('express');
  const {createStorefrontClient, InMemoryCache} = require('@shopify/hydrogen');

  installGlobals();

  const app = express();

  const BUILD_DIR = path.join(process.cwd(), 'build');

  app.use(
    '/build',
    express.static('public/build', {immutable: true, maxAge: '1y'}),
  );

  app.all('*', async (req) => {
    const {storefront} = createStorefrontClient({
      cache: new InMemoryCache(),
      // `waitUntil` is only needed on worker environments. For Express/Node, it isn't applicable
      waitUntil: null,
      i18n: {language: 'EN', country: 'US'},
      publicStorefrontToken: process.env.PUBLIC_STOREFRONT_API_TOKEN,
      privateStorefrontToken: process.env.PRIVATE_STOREFRONT_API_TOKEN,
      storeDomain: process.env.PUBLIC_STORE_DOMAIN,
      storefrontId: process.env.PUBLIC_STOREFRONT_ID,
      storefrontHeaders: {
        cookie: req.get('cookie'),
      },
    });

    return createRequestHandler({
      build: require(BUILD_DIR),
      mode: process.env.NODE_ENV,
      getLoadContext: () => ({storefront}),
    });
  });

  const port = process.env.PORT || 3000;

  app.listen(port, () => {
    console.log(`Express server listening on port ${port}`);
  });
  ```

***

## Related

[- createStorefrontClient](https://shopify.dev/docs/api/hydrogen/2026-04/utilities/createstorefrontclient)

***