Hono in-memory cache middleware

cache-middleware.ts

const CACHE_TIMEOUT_MS = 5 * 60 * 1000;
const cacheData = new Map<string, unknown>();
const cacheMiddleware = createMiddleware(async (c, next) => {
  if (c.req.method !== "GET") {
    await next();
    return;
  }
  const key = c.req.url;
  if (cacheData.has(key)) {
    // biome-ignore lint/style/noNonNullAssertion: checked null above
    return c.json(cacheData.get(key)!);
  } else {
    await next();
    const data = await c.res.clone().json();
    cacheData.set(key, data);
    setTimeout(() => {
      cacheData.delete(key);
    }, CACHE_TIMEOUT_MS);
  }
});

I created this as an alternative to hono/cache as the official solution doesn't work with NodeJS.