diff --git a/babel.config.js b/babel.config.js
new file mode 100644
index 0000000..9ea84ed
--- /dev/null
+++ b/babel.config.js
@@ -0,0 +1 @@
+module.exports = {presets: ['@babel/preset-env']}
diff --git a/jest.config.js b/jest.config.js
new file mode 100644
index 0000000..34e4834
--- /dev/null
+++ b/jest.config.js
@@ -0,0 +1,6 @@
+export default {
+transform: {
+    '^.+\\.js$': 'babel-jest',
+  },
+  testEnvironment: 'node',
+};
diff --git a/package.json b/package.json
index 7bb3735..c4ca3e3 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
   "description": "",
   "main": "app.js",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "jest"
   },
   "author": "Sam Hadow",
   "license": "BSD-3-Clause-Attribution",
@@ -16,5 +16,9 @@
     "express-session": "^1.18.1",
     "pg": "^8.13.1",
     "socket.io": "^4.8.1"
+  },
+  "devDependencies": {
+    "@babel/preset-env": "^7.26.8",
+    "jest": "^29.7.0"
   }
 }
diff --git a/src/public/ecc.js b/src/public/ecc.js
index 0016c70..20bc31d 100644
--- a/src/public/ecc.js
+++ b/src/public/ecc.js
@@ -2,7 +2,7 @@
 Convert  an ArrayBuffer into a string
 from https://developers.google.com/web/updates/2012/06/How-to-convert-ArrayBuffer-to-and-from-String
 */
-function ab2str(buf) {
+export function ab2str(buf) {
     return String.fromCharCode.apply(null, new Uint8Array(buf));
 }
 
@@ -10,7 +10,7 @@ function ab2str(buf) {
 Convert a string into an ArrayBuffer
 from https://developers.google.com/web/updates/2012/06/How-to-convert-ArrayBuffer-to-and-from-String
 */
-function str2ab(str) {
+export function str2ab(str) {
     const buf = new ArrayBuffer(str.length);
     const bufView = new Uint8Array(buf);
     for (let i = 0, strLen = str.length; i < strLen; i++) {
@@ -19,13 +19,13 @@ function str2ab(str) {
     return buf;
 }
 
-function exportedKeyToPem(key, type) {
+export function exportedKeyToPem(key, type) {
     let exportedAsString = ab2str(key);
     let exportedAsBase64 = window.btoa(exportedAsString);
     return `-----BEGIN ${type.toUpperCase()} KEY-----\n${exportedAsBase64}\n-----END ${type.toUpperCase()} KEY-----`;
 }
 
-function pemToKey(pemKey, type) {
+export function pemToKey(pemKey, type) {
     const base64 = pemKey.replace(`-----BEGIN ${type.toUpperCase()} KEY-----`, '').replace(`-----END ${type.toUpperCase()} KEY-----`, '').trim();
     const binaryDerString = window.atob(base64);
     const binaryDer = str2ab(binaryDerString);
@@ -41,7 +41,7 @@ function pemToKey(pemKey, type) {
 }
 
 
-async function genKey() {
+export async function genKey() {
   // Generate keys
     const { publicKey, privateKey } = await crypto.subtle.generateKey(
       {
diff --git a/src/public/index.html b/src/public/index.html
index a038878..97c46da 100644
--- a/src/public/index.html
+++ b/src/public/index.html
@@ -7,8 +7,8 @@
     <link rel="stylesheet" href="/style.css">
     <script src="/socket.io/socket.io.js" defer></script>
     <script src="/script.js" defer></script>
-    <script src="/ecc.js" defer></script>
-    <script src="/popups.js" defer></script>
+    <script type="module" src="/ecc.js" defer></script>
+    <script type="module" src="/popups.js" defer></script>
     <!--load bootstrap-->
     <link rel="stylesheet" href="/css/bootstrap.min.css" />
   </head>
diff --git a/src/public/popups.js b/src/public/popups.js
index 4b3860e..c52aea7 100644
--- a/src/public/popups.js
+++ b/src/public/popups.js
@@ -1,4 +1,6 @@
 const currentUrl = window.location.href;
+import { ab2str, exportedKeyToPem, pemToKey, genKey } from "./ecc.js";
+
 
 // close popups with escape key
 document.addEventListener("keydown", (event) => {
@@ -78,10 +80,10 @@ document.getElementById("loginconfirm").addEventListener("click", async function
     const { challenge } = await response.json();
     console.log("Received challenge:", challenge);
 
-    privKey = await pemToKey(inputFieldPrivateKey.value, "private");
+    let privKey = await pemToKey(inputFieldPrivateKey.value, "private");
 
     const encoder = new TextEncoder();
-    encodedData = encoder.encode(challenge);
+    let encodedData = encoder.encode(challenge);
 
     // Sign the data using the private key.
     const signature = await crypto.subtle.sign(
diff --git a/tests/ecc.test.js b/tests/ecc.test.js
new file mode 100644
index 0000000..3fe04c4
--- /dev/null
+++ b/tests/ecc.test.js
@@ -0,0 +1,23 @@
+import { ab2str, str2ab } from '../src/public/ecc.js';
+
+describe('ecc.js functions', () => {
+
+  // Test ab2str
+  it('should convert ArrayBuffer to string', () => {
+    const buffer = new ArrayBuffer(5);
+    const view = new Uint8Array(buffer);
+    view.set([72, 101, 108, 108, 111]); // ASCII values for "Hello"
+    const result = ab2str(buffer);
+    expect(result).toBe("Hello");
+  });
+
+  // Test str2ab
+  it('should convert string to ArrayBuffer', () => {
+    const str = "Hello";
+    const result = str2ab(str);
+    const expectedBuffer = new ArrayBuffer(5);
+    const expectedView = new Uint8Array(expectedBuffer);
+    expectedView.set([72, 101, 108, 108, 111]);
+    expect(result).toEqual(expectedBuffer);
+  });
+});