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Functions: revalidateTag | Next.js

revalidateTag allows you to purge cached data on-demand for a specific cache tag.

Good to know:

• revalidateTag only invalidates the cache when the path is next visited. This means calling revalidateTag with a dynamic route segment will not immediately trigger many revalidations at once. The invalidation only happens when the path is next visited.

revalidateTag(tag: string): void;

• tag: A string representing the cache tag associated with the data you want to revalidate. Must be less than or equal to 256 characters. This value is case-sensitive.

You can add tags to fetch as follows:

fetch(url, { next: { tags: [...] } });

revalidateTag does not return a value.

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

import type { NextRequest } from 'next/server'
import { revalidateTag } from 'next/cache'
 
export async function GET(request: NextRequest) {
  const tag = request.nextUrl.searchParams.get('tag')
  revalidateTag(tag)
  return Response.json({ revalidated: true, now: Date.now() })
}

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