# Source: https://nextjs.org/docs/app/api-reference/functions/revalidateTag.md

# revalidateTag
@doc-version: 16.0.4


`revalidateTag` allows you to invalidate [cached data](/docs/app/guides/caching.md) on-demand for a specific cache tag.

This function is ideal for content where a slight delay in updates is acceptable, such as blog posts, product catalogs, or documentation. Users receive stale content while fresh data loads in the background.

## Usage

`revalidateTag` can be called in Server Functions and Route Handlers.

`revalidateTag` cannot be called in Client Components or Proxy, as it only works in server environments.

### Revalidation Behavior

The revalidation behavior depends on whether you provide the second argument:

* **With `profile="max"` (recommended)**: The tag entry is marked as stale, and the next time a resource with that tag is visited, it will use stale-while-revalidate semantics. This means the stale content is served while fresh content is fetched in the background.
* **With a custom cache life profile**: For advanced usage, you can specify any cache life profile that your application has defined, allowing for custom revalidation behaviors tailored to your specific caching requirements.
* **Without the second argument (deprecated)**: The tag entry is expired immediately, and the next request to that resource will be a blocking revalidate/cache miss. This behavior is now deprecated, and you should either use `profile="max"` or migrate to [`updateTag`](/docs/app/api-reference/functions/updateTag.md).

> **Good to know**: When using `profile="max"`, `revalidateTag` marks tagged data as stale, but fresh data is only fetched when pages using that tag are next visited. This means calling `revalidateTag` will not immediately trigger many revalidations at once. The invalidation only happens when any page using that tag is next visited.

## Parameters

```ts
revalidateTag(tag: string, profile: string | { expire?: number }): void;
```

* `tag`: A string representing the cache tag associated with the data you want to revalidate. Must not exceed 256 characters. This value is case-sensitive.
* `profile`: A string that specifies the revalidation behavior. The recommended value is `"max"` which provides stale-while-revalidate semantics, or any of the other default or custom profiles defined in [`cacheLife`](/docs/app/api-reference/config/next-config-js/cacheLife.md). Alternatively, you can pass an object with an `expire` property for custom expiration behavior.

Tags must first be assigned to cached data. You can do this in two ways:

* Using the [`next.tags`](/docs/app/guides/caching.md#fetch-optionsnexttags-and-revalidatetag) option with `fetch` for caching external API requests:

```tsx
fetch(url, { next: { tags: ['posts'] } })
```

* Using [`cacheTag`](/docs/app/api-reference/functions/cacheTag.md) inside cached functions or components with the `'use cache'` directive:

```tsx
import { cacheTag } from 'next/cache'

async function getData() {
  'use cache'
  cacheTag('posts')
  // ...
}
```

> **Good to know**: The single-argument form `revalidateTag(tag)` is deprecated. It currently works if TypeScript errors are suppressed, but this behavior may be removed in a future version. Update to the two-argument signature.

## Returns

`revalidateTag` does not return a value.

## Relationship with `revalidatePath`

`revalidateTag` invalidates data with specific tags across all pages that use those tags, while [`revalidatePath`](/docs/app/api-reference/functions/revalidatePath.md) invalidates specific page or layout paths.

> **Good to know**: These functions serve different purposes and may need to be used together for comprehensive data consistency. For detailed examples and considerations, see [relationship with revalidateTag and updateTag](/docs/app/api-reference/functions/revalidatePath.md#relationship-with-revalidatetag-and-updatetag) for more information.

## Examples

The following examples demonstrate how to use `revalidateTag` in different contexts. In both cases, we're using `profile="max"` to mark data as stale and use stale-while-revalidate semantics, which is the recommended approach for most use cases.

### Server Action

```ts filename="app/actions.ts" switcher
'use server'

import { revalidateTag } from 'next/cache'

export default async function submit() {
  await addPost()
  revalidateTag('posts', 'max')
}
```

```js filename="app/actions.js" switcher
'use server'

import { revalidateTag } from 'next/cache'

export default async function submit() {
  await addPost()
  revalidateTag('posts', 'max')
}
```

### Route Handler

```ts filename="app/api/revalidate/route.ts" switcher
import type { NextRequest } from 'next/server'
import { revalidateTag } from 'next/cache'

export async function GET(request: NextRequest) {
  const tag = request.nextUrl.searchParams.get('tag')

  if (tag) {
    revalidateTag(tag, 'max')
    return Response.json({ revalidated: true, now: Date.now() })
  }

  return Response.json({
    revalidated: false,
    now: Date.now(),
    message: 'Missing tag to revalidate',
  })
}
```

```js filename="app/api/revalidate/route.js" switcher
import { revalidateTag } from 'next/cache'

export async function GET(request) {
  const tag = request.nextUrl.searchParams.get('tag')

  if (tag) {
    revalidateTag(tag, 'max')
    return Response.json({ revalidated: true, now: Date.now() })
  }

  return Response.json({
    revalidated: false,
    now: Date.now(),
    message: 'Missing tag to revalidate',
  })
}
```

> **Good to know**: For webhooks or third-party services that need immediate expiration, you can pass `{ expire: 0 }` as the second argument: `revalidateTag(tag, { expire: 0 })`. This pattern is necessary when external systems call your Route Handlers and require data to expire immediately. For all other cases, it's recommended to use [`updateTag`](/docs/app/api-reference/functions/updateTag.md) in Server Actions for immediate updates instead.