---
title: "Migrate to v2"
description: "Migrate from Unhead v1 to v2. Covers subpath exports, removed implicit context, opt-in plugins, and more."
canonical_url: "https://unhead.unjs.io/docs/migration-guide/v2"
last_updated: "2026-06-11T02:05:05.190Z"
---
With the release of Unhead v2, we now have first-class support for other frameworks. This guide covers the v1 to v2 migration.
## Client / Server Subpath Exports
🚦 Impact Level: **Critical**
**⚠️ Breaking Changes:**
- `createServerHead()` and `createHead()` exports from `unhead` are removed
The path where you import `createHead` from has been updated to be a subpath export.
**Client bundle:**
```diff
-import { createServerHead } from 'unhead'
+import { createHead } from 'unhead/client'
// avoids bundling server plugins
createHead()
```
**Server bundle:**
```diff
-import { createServerHead } from 'unhead'
+import { createHead } from 'unhead/server'
// avoids bundling server plugins
-createServerHead()
+createHead()
```
---
## Removed Implicit Context
🚦 Impact Level: **Critical**
**⚠️ Breaking Changes:**
- `getActiveHead()`, `activeHead` exports are removed
The implicit context implementation kept a global instance of Unhead available so that you could use the `useHead()` composables anywhere in your application.
In v2, the core composables no longer have access to the Unhead instance. Instead, you must pass the Unhead instance to the composables.
Passing the instance is only relevant if you're importing from `unhead`. In JavaScript frameworks we tie the context to the framework itself so you don't need to worry about this.
```ts [TypeScript v2]
import { useHead } from 'unhead'
// example of getting the instance
const unheadInstance = useMyApp().unhead
useHead(unheadInstance, {
title: 'Looks good'
})
```
---
## Removed `vmid`, `hid`, `children`, `body`
🚦 Impact Level: **High**
For legacy support with Vue Meta we allowed end users to provide deprecated properties: `vmid`, `hid`, `children` and `body`.
You must update these properties to the appropriate replacement or remove them. See the [v3 migration guide](/docs/migration-guide/v3#legacy-property-names) for the replacements.
---
## Opt-in Template Params & Tag Alias Sorting
🚦 Impact Level: **High**
To reduce the bundle size and improve performance, we've moved the template params and tag alias sorting to optional plugins.
```ts
import { AliasSortingPlugin, TemplateParamsPlugin } from 'unhead/plugins'
createHead({
plugins: [TemplateParamsPlugin, AliasSortingPlugin]
})
```
---
## Promise Input Support
🚦 Impact Level: **Medium**
If you have promises as input they will no longer be resolved, either await the promise before passing it along or register the optional promises plugin.
```ts
import { PromisePlugin } from 'unhead/plugins'
const unhead = createHead({
plugins: [PromisePlugin]
})
```
---
## Updated `useScript()`
🚦 Impact Level: **High**
**⚠️ Breaking Changes:**
- Script instance is no longer augmented as a proxy and promise
- `script.proxy` is rewritten for simpler, more stable behavior
- `stub()` and runtime hook `script:instance-fn` are removed
**Replacing promise usage**
```diff
const script = useScript()
-script.then(() => console.log('loaded')
+script.onLoaded(() => console.log('loaded'))
```
**Replacing proxy usage**
```diff
const script = useScript('..', {
use() { return { foo: [] } }
})
-script.foo.push('bar')
+script.proxy.foo.push('bar')
```
---
## Tag Sorting Updated
🚦 Impact Level: **Low**
[Capo.js](https://rviscomi.github.io/capo.js/) sorting is now the default. You can opt-out:
```ts
createHead({
disableCapoSorting: true,
})
```
---
## Default SSR Tags
🚦 Impact Level: **Low**
When SSR Unhead will now insert important default tags for you:
- ``
- ``
- ``
```ts
import { createHead } from 'unhead/server'
// disable when creating the head instance
const head = createHead({
disableDefaults: true,
})
```
---
## CJS Exports Removed
🚦 Impact Level: **Low**
CommonJS exports have been removed in favor of ESM only.
```diff
-const { createHead } = require('unhead/client')
+import { createHead } from 'unhead/client'
```
---
## Deprecated `@unhead/schema`
🚦 Impact Level: **Low**
The `@unhead/schema` package is deprecated. Import from `unhead/types` or `unhead` instead.
```diff
-import { HeadTag } from '@unhead/schema'
+import { HeadTag } from 'unhead/types'
```