diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index e9ca1fe..62ecfa6 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -1,23 +1,32 @@
 name: Build/test
 on:
-  push:
-    branches:
-      - "master"
-  pull_request:
+    push:
+        branches:
+            - 'master'
+    pull_request:
 jobs:
-  test:
-    runs-on: ${{ matrix.os }}
-    strategy:
-      fail-fast: true
-      matrix:
-        os: [macos-latest, ubuntu-latest]
-    steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-python@v4
-        with:
-          python-version: '3.11'
-      - uses: actions/setup-node@v3
-        with:
-          node-version: '18'
-      - run: npm install
-      - run: npm test
+    test:
+        runs-on: ${{ matrix.os }}
+        strategy:
+            fail-fast: true
+            matrix:
+                os: [macos-latest, ubuntu-latest]
+        steps:
+            - uses: actions/checkout@v3
+            - uses: actions/setup-python@v4
+              with:
+                  python-version: '3.11'
+            - uses: actions/setup-node@v3
+              with:
+                  node-version: '18'
+            - run: npm install
+            - name: generate grammar
+              run: npm run build
+            - name: check for uncommited changes
+              run: git diff --exit-code
+            - run: npm test
+    prettier:
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v3
+            - run: npx prettier --check *.js
diff --git a/grammar.js b/grammar.js
index 3617a7d..bfd33d1 100644
--- a/grammar.js
+++ b/grammar.js
@@ -1,3 +1,3 @@
-const make_grammar = require('./make_grammar');
+const make_grammar = require('./make_grammar')
 
-module.exports = make_grammar('gotmpl');
+module.exports = make_grammar('gotmpl')
diff --git a/package-lock.json b/package-lock.json
index c9b7433..9bfcc97 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,6 +12,7 @@
                 "nan": "^2.22.0"
             },
             "devDependencies": {
+                "prettier": "^3.4.2",
                 "tree-sitter-cli": "^0.24.7"
             }
         },
@@ -21,6 +22,22 @@
             "integrity": "sha512-nbajikzWTMwsW+eSsNm3QwlOs7het9gGJU5dDZzRTQGk03vyBOauxgI4VakDzE0PtsGTmXPsXTbbjVhRwR5mpw==",
             "license": "MIT"
         },
+        "node_modules/prettier": {
+            "version": "3.4.2",
+            "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.4.2.tgz",
+            "integrity": "sha512-e9MewbtFo+Fevyuxn/4rrcDAaq0IYxPGLvObpQjiZBMAzB9IGmzlnG9RZy3FFas+eBMu2vA0CszMeduow5dIuQ==",
+            "dev": true,
+            "license": "MIT",
+            "bin": {
+                "prettier": "bin/prettier.cjs"
+            },
+            "engines": {
+                "node": ">=14"
+            },
+            "funding": {
+                "url": "https://github.com/prettier/prettier?sponsor=1"
+            }
+        },
         "node_modules/tree-sitter-cli": {
             "version": "0.24.7",
             "resolved": "https://registry.npmjs.org/tree-sitter-cli/-/tree-sitter-cli-0.24.7.tgz",
diff --git a/package.json b/package.json
index 3da5959..da9b1d7 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,8 @@
         "nan": "^2.22.0"
     },
     "devDependencies": {
-        "tree-sitter-cli": "^0.24.7"
+        "tree-sitter-cli": "^0.24.7",
+        "prettier": "^3.4.2"
     },
     "scripts": {
         "build": "tree-sitter generate && node-gyp build && npm run build-helm",