ほとんどのドキュメント ページでは、画面の右側に API Explorer の縮小版が表示されます。API Explorer が表示されていない場合は、[試してみる] をクリックして、API Explorer の縮小版を表示します。
リファレンス ドキュメント ページの右側に [試してみる] が表示されない場合、そのメソッドは API Explorer でサポートされていません。たとえば、API Explorer はサービス アカウントを必要とする API と互換性がないため、そのような API のドキュメント ページには表示されません。
API Explorer の展開バージョンを表示する
API Explorer の展開バージョンには、cURL、HTTP、その他のコードサンプルが含まれています。API Explorer の拡大版を表示するには、全画面表示アイコン fullscreen をクリックします。
メソッドを実行する
API Explorer では、API メソッドの必須パラメータ、省略可能なパラメータ、リクエスト本文（該当する場合）を入力できます。list メソッドなど、多くの REST メソッドでは、メソッドを実行する前に 1 つまたは 2 つのフィールドを入力するだけで済みます。たとえば、Books API の books.volumes.list メソッドは、書籍を一覧表示するためにクエリ パラメータ（q）のみを必要とします。books.volumes.list メソッドを試すには:
[null,null,["最終更新日 2025-07-26 UTC。"],[[["\u003cp\u003eThe APIs Explorer allows you to test API methods directly in the documentation by providing parameters and executing requests.\u003c/p\u003e\n"],["\u003cp\u003eTo use the APIs Explorer with methods requiring authorization, you need to generate and use your own credentials.\u003c/p\u003e\n"],["\u003cp\u003eThe expanded APIs Explorer provides code samples in various formats like cURL and HTTP for easier integration.\u003c/p\u003e\n"],["\u003cp\u003eIf you encounter a 401 or 403 error, verify the authorization type and scope, as they are the most common causes.\u003c/p\u003e\n"],["\u003cp\u003eThe APIs Explorer uses popups for authorization, so ensure your browser settings allow them to function correctly.\u003c/p\u003e\n"]]],[],null,["# Display the APIs Explorer and execute a method\n\nOn most documentation pages, a condensed APIs Explorer is visible on the\nright-hand side of the screen. If the APIs Explorer isn't visible, click\n**Try it!** to display the condensed version of the APIs Explorer.\n\nIf **Try it!** doesn't appear on the right-hand side of a reference\ndocumentation page, the method isn't supported by the APIs Explorer. For\nexample, the APIs Explorer isn't compatible with APIs that require service\naccounts, so it doesn't appear on documentation pages for those APIs.\n\nDisplay the expanded version of the APIs Explorer\n-------------------------------------------------\n\nThe expanded version of the APIs Explorer contains cURL, HTTP, and possibly\nother code samples. To display the expanded version of the APIs Explorer,\nclick Full screen fullscreen.\n| **Note:** To run the code samples, you must generate and use your own authorization credentials. For an explanation of how to create a project and generate credentials, refer to your specific Google API's documentation.\n\nExecute a method\n----------------\n\nThe APIs Explorer lets you enter required parameters, optional parameters,\nand, if applicable, a request body for API methods. For many REST methods,\nsuch as list methods, you only need to fill one or two fields before you can\nexecute the method. For example, the Books API's\n[`books.volumes.list`](/books/docs/v1/reference/volumes/list)\nmethod only requires a query parameter (`q`) to list books. To try the\n[`books.volumes.list`](/books/docs/v1/reference/volumes/list)\nmethod:\n\n1. Navigate to [`books.volumes.list`](/books/docs/v1/reference/volumes/list).\n2. If the APIs Explorer isn't displayed, click **Try it!**\n3. In the **`q`** field, type *Hunger Games* (without any quotes or special characters).\n4. Scroll down and click **Execute**.\n5. (optional) A Google sign-in screen asks you to select a Google account.\n6. (optional) A Google authorization dialog asks you if it's okay to \"Manage your books.\" Click *Allow*. The results appear below the Execute button.\n\nIf the APIs Explorer shows a result of 200, then the method was successful.\n| **Note:** After you allow the authorization screen to make an authorized request, the APIs Explorer is authorized to make other requests until the credentials expire. Therefore, you don't see the authorization screen for every subsequent method call. For further information on credentials, see [Test with different credential types and scopes](/explorer-help/authorization-and-authentication).\n\nTroubleshoot APIs Explorer issues\n---------------------------------\n\n### You received a 401 or 403 error\n\nIf you're getting a 401 or 403 error when executing a method using the APIs\nExplorer, it is likely due to a problem with one of the following:\n\n- You're using the wrong authorization type (API key instead of OAuth 2.0). Try switching the authorization type.\n- You're using OAuth 2.0, but with too narrow a scope. Try using a broader scope.\n\n### Authorization dialog doesn't appear\n\nThe APIs Explorer uses a popup to grant access to your private data. If your\nbrowser blocks popups, this popup won't appear and you won't be able to grant\naccess.\n\nIf you click **Allow** in the authorization dialog and nothing happens, try\nchanging your browser's popup settings to enable popups."]]
