有別於 local 和 sync 儲存空間區域，managed 儲存空間區域的結構必須 宣告為 JSON 結構定義，且經過 Chrome 嚴格驗證。這個結構定義必須儲存在 檔案 (由 "storage" 資訊清單鍵的 "managed_schema" 屬性表示)，並宣告 擴充功能支援的企業政策。
政策類似選項 並允許系統預先設定適用於政策的擴充功能 或機構內的所有使用者如需相關示例，請參閱 Chrome 如何處理政策 。
宣告政策後，即可從 storage.managed API 讀取政策。取決於 強制執行管理員設定的政策。
manifest.json 範例
storage.managed_schema 屬性代表副檔名中含有政策的檔案 結構定義。
{ "name": "My enterprise extension", "storage": { "managed_schema": "schema.json" }, ... } Chrome 接著會從基礎作業系統和 Google Apps 載入這些政策 。偵測到政策變更時，會觸發 storage.onChanged 事件。 如要確認 Chrome 載入的政策，請前往 chrome://policy。
結構定義格式
JSON 結構定義格式還有 Chrome 額外規定：
- 頂層結構定義必須採用
object類型。 - 頂層
object不得包含additionalProperties。宣告的properties是 政策。 - 每個結構定義都必須有一個
$ref值或僅有一個type。
如果結構定義無效，Chrome 就不會載入擴充功能，且會說明 未驗證結構定義如果政策值不符合結構定義，就不會 storage.managed API 所發布。
結構定義範例
{ "type": "object", // "properties" maps an optional key of this object to its schema. At the // top-level object, these keys are the policy names supported. "properties": { // The policy name "AutoSave" is mapped to its schema, which in this case // declares it as a simple boolean value. // "title" and "description" are optional and are used to show a // user-friendly name and documentation to the administrator. "AutoSave": { "title": "Automatically save changes.", "description": "If set to true then changes will be automatically saved.", "type": "boolean" }, // Other simple types supported include "integer", "string" and "number". "PollRefreshRate": { "type": "integer" }, "DefaultServiceUrl": { "type": "string" }, // "array" is a list of items that conform to another schema, described // in "items". An example to this schema is [ "one", "two" ]. "ServiceUrls": { "type": "array", "items": { "type": "string" } }, // A more complex example that describes a list of bookmarks. Each bookmark // has a "title", and can have a "url" or a list of "children" bookmarks. // The "id" attribute is used to name a schema, and other schemas can reuse // it using the "$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" } } } } } }