diff --git a/.cspell.json b/.cspell.json
index 63d71da..dc09c20 100644
--- a/.cspell.json
+++ b/.cspell.json
@@ -15,9 +15,9 @@
   ],
   "dictionaryDefinitions": [
     {
-        "name": "custom-words",
-        "path": ".cspell/custom-words.txt",
-        "addWords": true
+      "name": "custom-words",
+      "path": ".cspell/custom-words.txt",
+      "addWords": true
     }
   ],
   "dictionaries": [
diff --git a/.cspell/custom-words.txt b/.cspell/custom-words.txt
index 16af9a4..2d9e222 100644
--- a/.cspell/custom-words.txt
+++ b/.cspell/custom-words.txt
@@ -74,6 +74,8 @@ renderable
 repudiable
 schemas
 sdjwt
+shellcheck
+codespell
 shopify
 superfences
 vulnz
diff --git a/.github/workflows/pre-commit.yml b/.github/workflows/pre-commit.yml
new file mode 100644
index 0000000..68bdb05
--- /dev/null
+++ b/.github/workflows/pre-commit.yml
@@ -0,0 +1,30 @@
+#   Copyright 2026 Google LLC
+#
+#   Licensed under the Apache License, Version 2.0 (the "License");
+#   you may not use this file except in compliance with the License.
+#   You may obtain a copy of the License at
+#
+#       http://www.apache.org/licenses/LICENSE-2.0
+#
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS,
+#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#   See the License for the specific language governing permissions and
+#   limitations under the License.
+
+name: pre-commit
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+jobs:
+  pre-commit:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+      - uses: pre-commit/action@v3.0.1
diff --git a/.gitignore b/.gitignore
index e10ddfd..1ebcbb4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@
 .ruff_cache
 uv.lock
 .venv
+node_modules/
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 100644
index 0000000..d653dcf
--- /dev/null
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,48 @@
+#   Copyright 2026 Google LLC
+#
+#   Licensed under the Apache License, Version 2.0 (the "License");
+#   you may not use this file except in compliance with the License.
+#   You may obtain a copy of the License at
+#
+#       http://www.apache.org/licenses/LICENSE-2.0
+#
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS,
+#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#   See the License for the specific language governing permissions and
+#   limitations under the License.
+
+exclude: '^(\.github/|\.vscode/|node_modules/).*|CODE_OF_CONDUCT\.md|CHANGELOG\.md'
+
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v6.0.0
+    hooks:
+      - id: trailing-whitespace
+      - id: end-of-file-fixer
+      - id: check-yaml
+        args: [--unsafe]
+      - id: check-json
+      - id: check-added-large-files
+      - id: check-shebang-scripts-are-executable
+      - id: check-executables-have-shebangs
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.14.13
+    hooks:
+      - id: ruff
+        args: [--fix, --exit-non-zero-on-fix]
+      - id: ruff-format
+  - repo: https://github.com/pre-commit/mirrors-prettier
+    rev: v4.0.0-alpha.8
+    hooks:
+      - id: prettier
+        files: \.(json|md|yaml|yml)$
+  - repo: https://github.com/koalaman/shellcheck-precommit
+    rev: v0.10.0
+    hooks:
+      - id: shellcheck
+        args: ["-e", "SC1091", "-e", "SC2086"]
+  - repo: https://github.com/codespell-project/codespell
+    rev: v2.4.1
+    hooks:
+      - id: codespell
diff --git a/LICENSE b/LICENSE
index 7a4a3ea..d645695 100644
--- a/LICENSE
+++ b/LICENSE
@@ -199,4 +199,4 @@
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
-   limitations under the License.
\ No newline at end of file
+   limitations under the License.
diff --git a/test_data/flower_shop/discounts.csv b/test_data/flower_shop/discounts.csv
index cf8bedd..9d613df 100644
--- a/test_data/flower_shop/discounts.csv
+++ b/test_data/flower_shop/discounts.csv
@@ -1,4 +1,4 @@
 code,type,value,description
 10OFF,percentage,10,10% Off
 WELCOME20,percentage,20,20% Off
-FIXED500,fixed_amount,500,$5.00 Off
\ No newline at end of file
+FIXED500,fixed_amount,500,$5.00 Off
diff --git a/test_data/flower_shop/products.csv b/test_data/flower_shop/products.csv
index dcf6a4a..5182012 100644
--- a/test_data/flower_shop/products.csv
+++ b/test_data/flower_shop/products.csv
@@ -4,4 +4,4 @@ pot_ceramic,Ceramic Pot,1500,https://example.com/pot.jpg
 bouquet_sunflowers,Sunflower Bundle,2500,https://example.com/sunflowers.jpg
 bouquet_tulips,Spring Tulips,3000,https://example.com/tulips.jpg
 orchid_white,White Orchid,4500,https://example.com/orchid.jpg
-gardenias,Gardenias,2000,https://example.com/gardenias.jpg
\ No newline at end of file
+gardenias,Gardenias,2000,https://example.com/gardenias.jpg