diff --git a/js/.gitignore b/js/.gitignore
new file mode 100644
index 0000000..3c3629e
--- /dev/null
+++ b/js/.gitignore
@@ -0,0 +1 @@
+node_modules
diff --git a/js/package-lock.json b/js/package-lock.json
new file mode 100644
index 0000000..2533dde
--- /dev/null
+++ b/js/package-lock.json
@@ -0,0 +1,14 @@
+{
+  "name": "pmtiles",
+  "version": "0.0.6",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "esbuild": {
+      "version": "0.11.14",
+      "resolved": "https://registry.npmjs.org/esbuild/-/esbuild-0.11.14.tgz",
+      "integrity": "sha512-ejheEPkqhq5y0LM9rG9e+3yDihPtqeeE4NZmG7VQiSGJ3CjO4HvPOHmhhttSksfSztjLAGo2+0/zSIvlqj4JOQ==",
+      "dev": true
+    }
+  }
+}
diff --git a/js/package.json b/js/package.json
index a90702f..d98cf4e 100644
--- a/js/package.json
+++ b/js/package.json
@@ -8,5 +8,8 @@
   },
   "homepage": "https://github.com/protomaps/pmtiles",
   "author": "Brandon Liu",
-  "license": "BSD-3-Clause"
+  "license": "BSD-3-Clause",
+  "devDependencies": {
+    "esbuild": "^0.11.14"
+  }
 }