diff --git a/docs/3-web-servers/08-database/index.mdx b/docs/3-web-servers/08-database/index.mdx
index 5f102b79..622e21cf 100644
--- a/docs/3-web-servers/08-database/index.mdx
+++ b/docs/3-web-servers/08-database/index.mdx
@@ -354,7 +354,7 @@ document.getElementById("send-button").onclick = async () => {
 <Answer title="手順8まで">
 
 ```javascript title="main.jsの抜粋 (サーバーとして動作するJavaScript)"
-app.use(express.urlencoded({ extended: true }));
+app.use(express.json());
 app.post("/posts", async (request, response) => {
   debugger; // ここでrequestオブジェクトの中身を確認
 });