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Next.js API Route Data Cache Issue on Vercel Deployment
In a Next.js v13.2 application, an API endpoint fetching data from a database encounters a peculiar behavior after deployment on Vercel. The same response is consistently returned, suggesting a caching issue.
Root Cause:
By default, Next.js caches all fetched data in API Routes and Server Components on production. When a request is made to the API route, the cached data is served instead of fetching new data from the database.
Solutions:
1. Per-Query Cache Control with fetch()
If using the fetch() API, you can override the default caching behavior by specifying the revalidate or cache options:
cache: Explicitly sets the cache behavior, options include:
Example:
<code class="js">fetch('https://...', { next: { revalidate: 10 } }); // OR fetch('https://...', { cache: 'no-store' });</code>
2. Route Segment Config for Generalized Caching
If you're not using fetch() or need to control caching at the route segment level, use Route Segment Config:
Example:
<code class="js">// layout.js OR page.js OR route.js import prisma from "./lib/prisma"; export const dynamic = "force-dynamic"; async function getPosts() { const posts = await prisma.post.findMany(); return posts; } export default async function Page() { const posts = await getPosts(); // ... }</code>
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