Store and expire data in Runtime Cache

Use getCache() for shared key/value cache across function isolates, with tags and plan quotas.

Runtime Cache is a deployment-scoped key/value store shared across function isolates. Use it for computed fragments, rate-limit counters, and other short-lived data that does not belong in your primary database. On Easel it implements the same getCache() contract as @vercel/functions.

For complete HTTP responses at the edge, use CDN caching instead.

Prerequisites

Your deployment must receive platform RUNTIME_CACHE_ENDPOINT. Easel injects that on deploy for supported runtimes. Auth is an invoke-time platform JWT bound onto getContext().cache (same path stock @vercel/functions getCache() prefers on Vercel functions).

Using Runtime Cache

Pick your stack. Both paths share the same platform store and tag clock.

app/products/[id]/page.tsx

import { cacheLife, cacheTag } from "next/cache";

async function getProduct(id: string) {
  "use cache: remote";
  cacheTag(`product-${id}`, "products");
  cacheLife({ expire: 3600 });
  return loadProduct(id);
}

export default async function Page({
  params,
}: {
  params: Promise<{ id: string }>;
}) {
  const { id } = await params;
  const product = await getProduct(id);
  return <pre>{JSON.stringify(product, null, 2)}</pre>;
}

You can also call getCache() from Next.js Route Handlers the same way as the Other example.

Expire by tag

app/actions.ts

"use server";

import { revalidateTag } from "next/cache";

export async function updateProduct(id: string) {
  await saveProduct(id);
  revalidateTag(`product-${id}`);
  revalidateTag("products");
}

revalidateTag and expireTag both update the shared platform tag clock and notify the edge CDN. expireTag also deletes matching Runtime Cache entry objects. If HTTP responses used the same Cache-Tag values, those CDN objects are eligible for purge. See Invalidate and revalidate cached content.

API surface

get: returns the stored value, or a miss when missing or expired
set: writes a value; optional ttl (seconds), tags, and name
delete: removes one key
expireTag: removes every entry that carried that tag (or tags)

Maximum item size is 2 MB. Treat the cache as best-effort speed, not durable storage.

Quotas and observability

Workspace plans include a Runtime Cache storage pool. Observability shows usage so you can trim keys or upgrade before writes fail. Prefer namespaced keys per feature so one workload does not crowd out another in the same workspace.