using-cache-lifecycle-apis

name	using-cache-lifecycle-apis
description	Teach cache lifecycle APIs in Next.js 16 - cacheLife(), cacheTag(), updateTag(), refresh(), revalidateTag(). Use when managing cache invalidation, setting cache policies, or implementing cache tags. Use when this capability is needed.
metadata	{"author":"djankies"}

Cache Lifecycle APIs in Next.js 16

Next.js 16 introduces comprehensive cache lifecycle APIs for fine-grained control over caching behavior. These APIs work together to manage cache policies, tagging, and invalidation across both private (CDN) and remote (server) caches.

Core Lifecycle APIs

cacheLife()

Sets cache duration profiles for fetch requests and route handlers. Replaces the need for manual revalidation intervals.

import { unstable_cacheLife as cacheLife } from 'next/cache';

export async function GET() {
  'use cache';
  cacheLife('hours');

  const data = await fetch('https://api.example.com/data');
  return Response.json(data);
}

Built-in Profiles:

• default: 15 minutes stale, 1 day revalidate, 1 week expire
• seconds: 1 second stale, 10 seconds revalidate, 1 minute expire
• minutes: 5 minutes stale, 1 hour revalidate, 1 day expire
• hours: 5 minutes stale, 1 hour revalidate, 1 day expire
• days: 5 minutes stale, 12 hours revalidate, 7 days expire
• weeks: 5 minutes stale, 24 hours revalidate, 30 days expire
• max: 5 minutes stale, indefinite revalidate, indefinite expire

Custom Profiles:

cacheLife({
  stale: 60,
  revalidate: 3600,
  expire: 86400,
});

Multiple Profiles:

cacheLife('hours', 'days');

cacheTag()

Associates cache entries with tags for targeted invalidation. Tags enable logical grouping of cached content.

import { unstable_cacheTag as cacheTag } from 'next/cache';

export async function GET() {
  'use cache';
  cacheTag('products');

  const products = await db.query.products.findMany();
  return Response.json(products);
}

Multiple Tags:

cacheTag('products', 'featured');

Tag Naming Convention:

• Use descriptive, hierarchical names: user:123, posts:featured
• Lowercase with hyphens or colons
• Avoid special characters

updateTag() / revalidateTag()

Invalidates all cache entries associated with a tag. revalidateTag() has a new signature in Next.js 16.

Breaking Change in Next.js 16:

import { revalidateTag } from 'next/cache';

export async function POST(request: Request) {
  const body = await request.json();

  await revalidateTag('products');

  return Response.json({ revalidated: true });
}

The new signature is async and returns a Promise. Previous versions were synchronous.

Server Action Usage:

'use server';

import { revalidateTag } from 'next/cache';

export async function updateProducts() {
  await db.products.update();

  await revalidateTag('products');
  await revalidateTag('featured');
}

refresh()

Forces immediate revalidation of the current page without invalidating tags.

import { refresh } from 'next/cache';

export async function POST() {
  'use server';

  await db.update();

  refresh();

  return { success: true };
}

Private vs Remote Caching

Private Caching (CDN)

Caches at the edge closest to users. Controlled by Cache-Control headers.

export async function GET() {
  'use cache';
  cacheLife('hours');

  return Response.json(data, {
    headers: {
      'Cache-Control': 'private, max-age=3600',
    },
  });
}

Use Cases:

• User-specific content
• Authenticated data
• Regional content

Remote Caching (Server)

Caches on the Next.js server or shared infrastructure. Controlled by cacheLife() and tags.

export async function GET() {
  'use cache';
  cacheLife('days');
  cacheTag('public-data');

  return Response.json(data);
}

Use Cases:

• Public data
• Shared across users
• Database query results

Hybrid Strategy

Combine both for optimal performance:

export async function GET(request: Request) {
  'use cache';
  cacheLife('hours');
  cacheTag('products');

  const userId = request.headers.get('x-user-id');
  const products = await getProducts(userId);

  return Response.json(products, {
    headers: {
      'Cache-Control': 'private, s-maxage=3600, stale-while-revalidate=86400',
    },
  });
}

Cache Invalidation Strategies

On-Demand Invalidation

Invalidate immediately when data changes:

'use server';

import { revalidateTag } from 'next/cache';

export async function createProduct(formData: FormData) {
  await db.products.create({
    name: formData.get('name'),
  });

  await revalidateTag('products');
  await revalidateTag('homepage');
}

Scheduled Invalidation

Use cacheLife() with appropriate profiles for periodic updates:

export async function GET() {
  'use cache';
  cacheLife('hours');

  const stats = await getAnalytics();
  return Response.json(stats);
}

Granular Invalidation

Tag different aspects of data for targeted updates:

export async function getProduct(id: string) {
  'use cache';
  cacheTag(`product:${id}`, 'products', 'catalog');

  return db.query.products.findFirst({ where: { id } });
}

export async function updateProduct(id: string, data: any) {
  'use server';

  await db.products.update({ where: { id }, data });

  await revalidateTag(`product:${id}`);
}

Cascading Invalidation

Invalidate related caches together:

export async function deleteProduct(id: string) {
  'use server';

  const product = await db.products.findUnique({ where: { id } });

  await db.products.delete({ where: { id } });

  await Promise.all([
    revalidateTag(`product:${id}`),
    revalidateTag('products'),
    revalidateTag(`category:${product.categoryId}`),
    revalidateTag('search-results'),
  ]);
}

Complete Example: E-commerce Product Management

import {
  unstable_cacheLife as cacheLife,
  unstable_cacheTag as cacheTag,
  revalidateTag,
} from 'next/cache';

export async function GET(
  request: Request,
  { params }: { params: { id: string } }
) {
  'use cache';
  cacheLife('hours');
  cacheTag(`product:${params.id}`, 'products');

  const product = await db.query.products.findFirst({
    where: { id: params.id },
    with: { reviews: true, category: true },
  });

  return Response.json(product, {
    headers: {
      'Cache-Control': 'public, s-maxage=3600, stale-while-revalidate=86400',
    },
  });
}

export async function PUT(
  request: Request,
  { params }: { params: { id: string } }
) {
  const body = await request.json();

  const product =  db..({
    : { : params. },
    : body,
  });

   .([
    (),
    (),
    (),
  ]);

   .({ : , product });
}

   () {
   product =  db..({
    : { : params. },
  });

   db..({ : { : params. } });

   .([
    (),
    (),
    (),
    (),
    (),
  ]);

   .({ :  });
}

Best Practices

1. Profile Selection: Use built-in profiles for consistency
2. Tag Hierarchy: Create logical tag groupings for efficient invalidation
3. Async Handling: Always await revalidateTag() calls
4. Tag Reuse: Apply same tags to related cached content
5. Private Data: Use private Cache-Control for user-specific content
6. Granular Tags: Combine specific and general tags for flexibility
7. Error Handling: Wrap invalidation in try-catch blocks
8. Performance: Batch revalidateTag() calls with Promise.all()

Query Optimization for Cached Data

When caching database queries, optimize query selection and pagination to prevent performance issues:

• If optimizing field selection in cached Prisma queries, use the optimizing-query-selection skill from prisma-6 for select() patterns preventing over-fetching
• If implementing pagination in cached Prisma endpoints, use the implementing-query-pagination skill from prisma-6 for cursor vs offset pagination patterns
• If implementing query result caching with Redis, use the implementing-query-caching skill from prisma-6 for cache key generation, invalidation strategies, and TTL management

Common Patterns

Time-Based + Tag-Based Caching

export async function GET() {
  'use cache';
  cacheLife('days');
  cacheTag('blog-posts');

  const posts = await db.query.posts.findMany();
  return Response.json(posts);
}

User-Scoped Caching

export async function GET(request: Request) {
  'use cache';
  const userId = request.headers.get('x-user-id');
  cacheTag(`user:${userId}`);
  cacheLife('minutes');

  const data = await getUserData(userId);

  return Response.json(data, {
    headers: { 'Cache-Control': 'private, max-age=300' },
  });
}

Background Revalidation

export async function webhookHandler(request: Request) {
  const event = await request.json();

  if (event.type === 'product.updated') {
    await revalidateTag(`product:${event.productId}`);
    await revalidateTag('products');
  }

  return Response.json({ received: true });
}

Migration Notes

When upgrading from Next.js 15 to 16:

1. Update all revalidateTag() calls to handle Promises:

   revalidateTag('tag');
   

   becomes:

   await revalidateTag('tag');
   

2. Replace manual revalidation with cacheLife():

   export const revalidate = 3600;
   

   becomes:

   cacheLife('hours');
   

3. Use cacheTag() instead of custom headers for invalidation

4. Import APIs from 'next/cache' with unstable_ prefix where required

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