diff --git a/.github/workflows/format_check.yml b/.github/workflows/format_check.yml
new file mode 100644
index 0000000..2d954bf
--- /dev/null
+++ b/.github/workflows/format_check.yml
@@ -0,0 +1,27 @@
+name: Format Check
+
+on:
+  push:
+    branches:
+      - main
+      - format_ca
+  pull_request:
+    branches:
+      - main
+      - format_ca
+
+jobs:
+  prettier-check:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v2
+
+      - name: Set up Node.js and pnpm
+        uses: pnpm/action-setup@v2
+        with:
+          version: 8
+
+      - name: Format check on react-todo
+        run: cd packages/react-todo && pnpm install && pnpm run check
\ No newline at end of file
diff --git a/packages/react-todo/package.json b/packages/react-todo/package.json
index 8e53efb..fca5f9b 100644
--- a/packages/react-todo/package.json
+++ b/packages/react-todo/package.json
@@ -8,7 +8,8 @@
         "build": "vite build",
         "lint": "eslint . --ext js,jsx --report-unused-disable-directives --max-warnings 0",
         "preview": "vite preview",
-        "format": "pnpm exec -- npx prettier --write ."
+        "format": "pnpm exec -- npx prettier --write .",
+        "check": "pnpm exec -- npx prettier --check ."
     },
     "dependencies": {
         "react": "^18.2.0",
@@ -25,4 +26,4 @@
         "prettier": "^3.0.1",
         "vite": "^4.4.5"
     }
-}
+}
\ No newline at end of file
diff --git a/packages/svelte-todo/package.json b/packages/svelte-todo/package.json
index 646d184..a19cfb8 100644
--- a/packages/svelte-todo/package.json
+++ b/packages/svelte-todo/package.json
@@ -11,6 +11,7 @@
         "check:watch": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json --watch",
         "lint": "prettier --plugin-search-dir . --check . && eslint .",
         "format": "prettier --plugin-search-dir . --write .",
+        "prettier:check": "pnpm exec -- npx prettier --plugin-search-dir . --check .",
         "test:integration": "playwright test",
         "test:unit": "vitest"
     },
@@ -33,4 +34,4 @@
         "vitest": "^0.32.2"
     },
     "type": "module"
-}
+}
\ No newline at end of file
diff --git a/packages/vanilla-todo/package.json b/packages/vanilla-todo/package.json
index 508c98c..e00ac88 100644
--- a/packages/vanilla-todo/package.json
+++ b/packages/vanilla-todo/package.json
@@ -7,9 +7,10 @@
         "dev": "vite",
         "build": "vite build",
         "preview": "vite preview",
-        "format": "pnpm exec -- npx prettier --write ."
+        "format": "pnpm exec -- npx prettier --write .",
+        "check": "pnpm exec -- npx prettier --check ."
     },
     "devDependencies": {
         "vite": "^4.4.5"
     }
-}
+}
\ No newline at end of file
diff --git a/packages/vue-todo/package.json b/packages/vue-todo/package.json
index 3edd80c..c121316 100644
--- a/packages/vue-todo/package.json
+++ b/packages/vue-todo/package.json
@@ -7,7 +7,8 @@
         "dev": "vite",
         "build": "vue-tsc && vite build",
         "preview": "vite preview",
-        "format": "pnpm exec -- npx prettier --write ."
+        "format": "pnpm exec -- npx prettier --write .",
+        "check": "pnpm exec -- npx prettier --check ."
     },
     "dependencies": {
         "vue": "^3.3.4"
@@ -18,4 +19,4 @@
         "vite": "^4.4.5",
         "vue-tsc": "^1.8.5"
     }
-}
+}
\ No newline at end of file