> [!WARNING]
> **Warning:** You're viewing the deprecated Manifest V2 version of this article. See [Manifest V3 - Manifest storage](https://developer.chrome.com/docs/extensions/reference/manifest/storage.md.txt) for the MV3 equivalent. The Chrome Web Store no longer accepts Manifest V2 extensions. Follow the [Manifest V3 Migration guide](https://developer.chrome.com/docs/extensions/develop/migrate.md.txt) to convert your extension to Manifest V3.

Unlike the `local` and `sync` storage areas, the `managed` storage area requires its structure to be
declared as [JSON Schema](https://tools.ietf.org/html/draft-zyp-json-schema-03) and is strictly validated by Chrome. This schema must be stored in a
file indicated by the `"managed_schema"` property of the `"storage"` manifest key and declares the
enterprise policies supported by the extension.

Policies are analogous to options but are configured by a system administrator instead of the user,
allowing the extension to be preconfigured for all users of an organization. See [how Chrome handles
policies](https://www.chromium.org/administrators/) for examples from Chrome itself.

After declaring the policies they can be read from the [storage.managed](https://developer.chrome.com/docs/extensions/reference/storage#property-managed) API. It's up to the
extension to enforce the policies configured by the administrator.

## Sample manifest.json

The `storage.managed_schema` property indicates a file within the extension that contains the policy
schema.

```json
{
  "name": "My enterprise extension",
  "storage": {
    "managed_schema": "schema.json"
  },
  ...
}
```

Chrome will then load these policies from the underlying operating system and from Google Apps for
signed-in users. The [storage.onChanged](https://developer.chrome.com/docs/extensions/reference/storage#event-onChanged) event is fired whenever a policy change is detected,
including while the browser wasn't running if the extension uses [event pages](https://developer.chrome.com/docs/extensions/mv2/event_pages). You can verify
the policies that Chrome loaded at <chrome://policy>.

## Schema format

The JSON Schema format has some additional requirements from Chrome:

- The top-level schema must have type `object`.
- The top-level `object` can't have `additionalProperties`. The `properties` declared are the policies for this extension.
- Each schema must have either a `$ref` value or exactly one `type`.

If the schema is invalid then Chrome won't load the extension and will indicate the reason why the
schema wasn't validated. If a policy value does not conform to the schema then it will not be
published by the `storage.managed` API.

## Sample schema

```json
{
  "type": "object",

  // "properties" maps an optional key of this object to its schema. At the
  // top-level object, these keys are the policy names supported.
  "properties": {

    // The policy name "AutoSave" is mapped to its schema, which in this case
    // declares it as a simple boolean value.
    // "title" and "description" are optional and are used to show a
    // user-friendly name and documentation to the administrator.
    "AutoSave": {
      "title": "Automatically save changes.",
      "description": "If set to true then changes will be automatically saved.",
      "type": "boolean"
    },

    // Other simple types supported include "integer", "string" and "number".
    "PollRefreshRate": {
      "type": "integer"
    },

    "DefaultServiceUrl": {
      "type": "string"
    },

    // "array" is a list of items that conform to another schema, described
    // in "items". An example to this schema is [ "one", "two" ].
    "ServiceUrls": {
      "type": "array",
      "items": {
        "type": "string"
      }
    },

    // A more complex example that describes a list of bookmarks. Each bookmark
    // has a "title", and can have a "url" or a list of "children" bookmarks.
    // The "id" attribute is used to name a schema, and other schemas can reuse
    // it using the "$ref" attribute.
    "Bookmarks": {
      "type": "array",
      "id": "ListOfBookmarks",
      "items": {
        "type": "object",
        "properties": {
          "title": { "type": "string" },
          "url": { "type": "string" },
          "children": { "$ref": "ListOfBookmarks" }
        }
      }
    },

    // An "object" can have known properties listed as "properties", and can
    // optionally have "additionalProperties" indicating a schema to apply to
    // keys that aren't found in "properties".
    // This example policy could map a URL to its settings. An example value:
    // {
    //   "youtube.com": {
    //     "blocklisted": true
    //   },
    //   "google.com": {
    //     "bypass_proxy": true
    //   }
    // }
    "SettingsForUrls": {
      "type": "object",
      "additionalProperties": {
        "type": "object",
        "properties": {
          "blocklisted": { "type": "boolean" },
          "bypass_proxy": { "type": "boolean" }
        }
      }
    }
  }
}
```