diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..95ff797
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,28 @@
+{
+  "name": "ocma-data",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "devDependencies": {
+        "prettier": "^3.7.3"
+      }
+    },
+    "node_modules/prettier": {
+      "version": "3.7.4",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.7.4.tgz",
+      "integrity": "sha512-v6UNi1+3hSlVvv8fSaoUbggEM5VErKmmpGA7Pl3HF8V6uKY7rvClBOJlH6yNwQtfTueNkGVpOv/mtWL9L4bgRA==",
+      "dev": true,
+      "license": "MIT",
+      "bin": {
+        "prettier": "bin/prettier.cjs"
+      },
+      "engines": {
+        "node": ">=14"
+      },
+      "funding": {
+        "url": "https://github.com/prettier/prettier?sponsor=1"
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..5c64607
--- /dev/null
+++ b/package.json
@@ -0,0 +1,9 @@
+{
+  "scripts": {
+    "format": "prettier --check ."
+  },
+  "type": "module",
+  "devDependencies": {
+    "prettier": "^3.7.3"
+  }
+}