diff --git a/jex/build-browser.js b/jex/build-browser.js
index bf15c828..d1944a7b 100644
--- a/jex/build-browser.js
+++ b/jex/build-browser.js
@@ -8,6 +8,7 @@ esbuild
     platform: 'browser',
     format: 'esm',
     outfile: 'dist/index.mjs',
+    inject: ['shims.js'],
     plugins: [polyfillNode()]
   })
   .catch(() => process.exit(1))
diff --git a/jex/package.json b/jex/package.json
index b6363835..195c94a7 100644
--- a/jex/package.json
+++ b/jex/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@bpinternal/jex",
-  "version": "1.2.0",
+  "version": "1.2.1",
   "description": "JSON-Extends; JSON Schema type checking library",
   "main": "dist/index.cjs",
   "module": "./dist/index.mjs",
@@ -26,6 +26,7 @@
     "@types/lodash": "^4.14.202",
     "@vitest/browser": "^2.1.8",
     "ajv": "^8.12.0",
+    "buffer": "^6.0.3",
     "esbuild": "^0.24.0",
     "esbuild-plugin-polyfill-node": "^0.3.0",
     "playwright": "^1.49.0",
diff --git a/jex/pnpm-lock.yaml b/jex/pnpm-lock.yaml
index c30b3019..c1b9e18a 100644
--- a/jex/pnpm-lock.yaml
+++ b/jex/pnpm-lock.yaml
@@ -28,6 +28,9 @@ devDependencies:
   ajv:
     specifier: ^8.12.0
     version: 8.17.1
+  buffer:
+    specifier: ^6.0.3
+    version: 6.0.3
   esbuild:
     specifier: ^0.24.0
     version: 0.24.0
@@ -1010,6 +1013,17 @@ packages:
     engines: {node: '>=12'}
     dev: true
 
+  /base64-js@1.5.1:
+    resolution: {integrity: sha512-AKpaYlHn8t4SVbOHCy+b5+KKgvR4vrsD8vbvrbiQJps7fKDTkjkDry6ji0rUJjC0kzbNePLwzxq8iypo41qeWA==}
+    dev: true
+
+  /buffer@6.0.3:
+    resolution: {integrity: sha512-FTiCpNxtwiZZHEZbcbTIcZjERVICn9yq/pDFkTl95/AxzD1naBctN7YO68riM/gLSDY7sdrMby8hofADYuuqOA==}
+    dependencies:
+      base64-js: 1.5.1
+      ieee754: 1.2.1
+    dev: true
+
   /cac@6.7.14:
     resolution: {integrity: sha512-b6Ilus+c3RrdDk+JhLKUAQfzzgLEPy6wcXqS7f/xe1EETvsDP6GORG7SFuOs6cID5YkqchW/LXZbX5bc8j7ZcQ==}
     engines: {node: '>=8'}
@@ -1264,6 +1278,10 @@ packages:
     resolution: {integrity: sha512-IScLbePpkvO846sIwOtOTDjutRMWdXdJmXdMvk6gCBHxFO8d+QKOQedyZSxFTTFYRSmlgSTDtXqqq4pcenBXLQ==}
     dev: true
 
+  /ieee754@1.2.1:
+    resolution: {integrity: sha512-dcyqhDvX1C46lXZcVqCpK+FtMRQVdIMN6/Df5js2zouUsqG7I6sFxitIC+7KYK29KdXOLHdu9zL4sFnoVQnqaA==}
+    dev: true
+
   /import-meta-resolve@3.1.1:
     resolution: {integrity: sha512-qeywsE/KC3w9Fd2ORrRDUw6nS/nLwZpXgfrOc2IILvZYnCaEMd+D56Vfg9k4G29gIeVi3XKql1RQatME8iYsiw==}
     dev: true
diff --git a/jex/shims.js b/jex/shims.js
new file mode 100644
index 00000000..46780c72
--- /dev/null
+++ b/jex/shims.js
@@ -0,0 +1,6 @@
+import { Buffer } from 'buffer'
+
+// Ensure Buffer is available globally
+if (typeof globalThis.Buffer === 'undefined') {
+  globalThis.Buffer = Buffer
+}