diff --git a/curriculum/challenges/japanese/02-javascript-algorithms-and-data-structures/basic-javascript/subtract-one-number-from-another-with-javascript.md b/curriculum/challenges/japanese/02-javascript-algorithms-and-data-structures/basic-javascript/subtract-one-number-from-another-with-javascript.md
index 4c229edda2d..79eac1bcfba 100644
--- a/curriculum/challenges/japanese/02-javascript-algorithms-and-data-structures/basic-javascript/subtract-one-number-from-another-with-javascript.md
+++ b/curriculum/challenges/japanese/02-javascript-algorithms-and-data-structures/basic-javascript/subtract-one-number-from-another-with-javascript.md
@@ -26,13 +26,13 @@ const myVar = 12 - 6;
 
 # --hints--
 
-The variable `difference` should be equal to `12`.
+変数 `difference` は `12` に等しくなる必要があります。
 
 ```js
 assert(difference === 12);
 ```
 
-You should only subtract one number from `45`.
+`45` から 1 つの数値だけを引いてください。
 
 ```js
 assert(/difference=45-33;?/.test(__helpers.removeWhiteSpace(code)));
diff --git a/curriculum/challenges/japanese/05-back-end-development-and-apis/back-end-development-and-apis-projects/timestamp-microservice.md b/curriculum/challenges/japanese/05-back-end-development-and-apis/back-end-development-and-apis-projects/timestamp-microservice.md
index 891d5f4f69c..4d71e1e0c16 100644
--- a/curriculum/challenges/japanese/05-back-end-development-and-apis/back-end-development-and-apis-projects/timestamp-microservice.md
+++ b/curriculum/challenges/japanese/05-back-end-development-and-apis/back-end-development-and-apis-projects/timestamp-microservice.md
@@ -106,7 +106,7 @@ Replit を使用する場合は、下記の手順でプロジェクトをセッ
   );
 ```
 
-If the input date string is invalid, the API returns an object having the structure `{ error : "Invalid Date" }`
+入力された日付文字列が無効な場合、API は `{ error : "Invalid Date" }` という構造のオブジェクトを返します。
 
 ```js
 (getUserInput) =>
diff --git a/curriculum/challenges/japanese/05-back-end-development-and-apis/basic-node-and-express/serve-json-on-a-specific-route.md b/curriculum/challenges/japanese/05-back-end-development-and-apis/basic-node-and-express/serve-json-on-a-specific-route.md
index fb3f4592e27..81be56a2a89 100644
--- a/curriculum/challenges/japanese/05-back-end-development-and-apis/basic-node-and-express/serve-json-on-a-specific-route.md
+++ b/curriculum/challenges/japanese/05-back-end-development-and-apis/basic-node-and-express/serve-json-on-a-specific-route.md
@@ -18,7 +18,7 @@ HTML サーバーは HTML を提供しますが、API はデータを提供し
 
 # --hints--
 
-The endpoint `/json` should serve the JSON object `{"message": "Hello json"}`
+エンドポイント `/json` は JSON オブジェクト `{"message": "Hello json"}` を提供する必要があります。
 
 ```js
 (getUserInput) =>
diff --git a/curriculum/challenges/portuguese/05-back-end-development-and-apis/basic-node-and-express/serve-json-on-a-specific-route.md b/curriculum/challenges/portuguese/05-back-end-development-and-apis/basic-node-and-express/serve-json-on-a-specific-route.md
index c158b551d15..8e415bed18c 100644
--- a/curriculum/challenges/portuguese/05-back-end-development-and-apis/basic-node-and-express/serve-json-on-a-specific-route.md
+++ b/curriculum/challenges/portuguese/05-back-end-development-and-apis/basic-node-and-express/serve-json-on-a-specific-route.md
@@ -18,7 +18,7 @@ Sirva o objeto `{"message": "Hello json"}` como uma resposta, no formato JSON, p
 
 # --hints--
 
-The endpoint `/json` should serve the JSON object `{"message": "Hello json"}`
+O `/json` do endpoint deve servir o objeto JSON `{"message": "Hello json"}`
 
 ```js
 (getUserInput) =>