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Showing content from https://nextjs.org/docs/app/api-reference/functions/cacheTag below:

Functions: cacheTag | Next.js

The cacheTag function allows you to tag cached data for on-demand invalidation. By associating tags with cache entries, you can selectively purge or revalidate specific cache entries without affecting other cached data.

To use cacheTag, enable the cacheComponents flag in your next.config.js file:

import type { NextConfig } from 'next'
 
const nextConfig: NextConfig = {
  experimental: {
    cacheComponents: true,
  },
}
 
export default nextConfig

The cacheTag function takes one or more string values.

import { unstable_cacheTag as cacheTag } from 'next/cache'
 
export async function getData() {
  'use cache'
  cacheTag('my-data')
  const data = await fetch('/api/data')
  return data
}

You can then purge the cache on-demand using revalidateTag API in another function, for example, a route handler or Server Action:

'use server'
 
import { revalidateTag } from 'next/cache'
 
export default async function submit() {
  await addPost()
  revalidateTag('my-data')
}

• Idempotent Tags: Applying the same tag multiple times has no additional effect.
• Multiple Tags: You can assign multiple tags to a single cache entry by passing multiple string values to cacheTag.

cacheTag('tag-one', 'tag-two')

Tag your cached data by calling cacheTag within a cached function or component:

import { unstable_cacheTag as cacheTag } from 'next/cache'
 
interface BookingsProps {
  type: string
}
 
export async function Bookings({ type = 'haircut' }: BookingsProps) {
  'use cache'
  cacheTag('bookings-data')
 
  async function getBookingsData() {
    const data = await fetch(`/api/bookings?type=${encodeURIComponent(type)}`)
    return data
  }
 
  return //...
}

You can use the data returned from an async function to tag the cache entry.

import { unstable_cacheTag as cacheTag } from 'next/cache'
 
interface BookingsProps {
  type: string
}
 
export async function Bookings({ type = 'haircut' }: BookingsProps) {
  async function getBookingsData() {
    'use cache'
    const data = await fetch(`/api/bookings?type=${encodeURIComponent(type)}`)
    cacheTag('bookings-data', data.id)
    return data
  }
  return //...
}

Using revalidateTag, you can invalidate the cache for a specific tag when needed:

'use server'
 
import { revalidateTag } from 'next/cache'
 
export async function updateBookings() {
  await updateBookingData()
  revalidateTag('bookings-data')
}

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