diff --git a/cjs/index.cjs b/cjs/index.cjs
new file mode 100644
index 0000000..431ca97
--- /dev/null
+++ b/cjs/index.cjs
@@ -0,0 +1,189 @@
+var __create = Object.create;
+var __defProp = Object.defineProperty;
+var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
+var __getOwnPropNames = Object.getOwnPropertyNames;
+var __getProtoOf = Object.getPrototypeOf;
+var __hasOwnProp = Object.prototype.hasOwnProperty;
+var __export = (target, all) => {
+  for (var name in all)
+    __defProp(target, name, { get: all[name], enumerable: true });
+};
+var __copyProps = (to, from, except, desc) => {
+  if (from && typeof from === "object" || typeof from === "function") {
+    for (let key of __getOwnPropNames(from))
+      if (!__hasOwnProp.call(to, key) && key !== except)
+        __defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
+  }
+  return to;
+};
+var __toESM = (mod, isNodeMode, target) => (target = mod != null ? __create(__getProtoOf(mod)) : {}, __copyProps(
+  // If the importer is in node compatibility mode or this is not an ESM
+  // file that has been converted to a CommonJS file using a Babel-
+  // compatible transform (i.e. "__esModule" has not been set), then set
+  // "default" to the CommonJS "module.exports" for node compatibility.
+  isNodeMode || !mod || !mod.__esModule ? __defProp(target, "default", { value: mod, enumerable: true }) : target,
+  mod
+));
+var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);
+
+// src/index.js
+var index_exports = {};
+__export(index_exports, {
+  generateAccessToken: () => generateAccessToken,
+  invalidateCache: () => invalidateCache
+});
+module.exports = __toCommonJS(index_exports);
+
+// src/errors.js
+var import_aio_lib_core_errors = require("@adobe/aio-lib-core-errors");
+var { ErrorWrapper, createUpdater } = import_aio_lib_core_errors.AioCoreSDKErrorWrapper;
+var codes = {};
+var messages = /* @__PURE__ */ new Map();
+var Updater = createUpdater(
+  // object that stores the error classes (to be exported)
+  codes,
+  // Map that stores the error strings (to be exported)
+  messages
+);
+var E = ErrorWrapper(
+  // The class name for your SDK Error. Your Error objects will be these objects
+  "AuthSDKError",
+  // The name of your SDK. This will be a property in your Error objects
+  "AuthSDK",
+  // the object returned from the CreateUpdater call above
+  Updater
+);
+E("IMS_TOKEN_ERROR", "Error calling IMS to get access token: %s");
+E("MISSING_PARAMETERS", "Missing required parameters: %s");
+E("BAD_CREDENTIALS_FORMAT", "Credentials must be either an object or a stringified object");
+E("BAD_SCOPES_FORMAT", "Scopes must be an array");
+E("GENERIC_ERROR", "An unexpected error occurred: %s");
+
+// src/ims.js
+var IMS_BASE_URL_PROD = "https://ims-na1.adobelogin.com";
+var IMS_BASE_URL_STAGE = "https://ims-na1-stg1.adobelogin.com";
+function getImsUrl(env) {
+  return env === "stage" ? IMS_BASE_URL_STAGE : IMS_BASE_URL_PROD;
+}
+function getAndValidateCredentials(params) {
+  if (!(typeof params === "object" && params !== null && !Array.isArray(params))) {
+    throw new codes.BAD_CREDENTIALS_FORMAT({
+      sdkDetails: { paramsType: typeof params }
+    });
+  }
+  if (params.scopes && !Array.isArray(params.scopes)) {
+    throw new codes.BAD_SCOPES_FORMAT({
+      sdkDetails: { scopesType: typeof params.scopes }
+    });
+  }
+  const credentials = {};
+  credentials.clientId = params.clientId || params.client_id;
+  credentials.clientSecret = params.clientSecret || params.client_secret;
+  credentials.orgId = params.orgId || params.org_id;
+  credentials.scopes = params.scopes || [];
+  const { clientId, clientSecret, orgId, scopes } = credentials;
+  const missingParams = [];
+  if (!clientId) {
+    missingParams.push("clientId");
+  }
+  if (!clientSecret) {
+    missingParams.push("clientSecret");
+  }
+  if (!orgId) {
+    missingParams.push("orgId");
+  }
+  if (missingParams.length > 0) {
+    throw new codes.MISSING_PARAMETERS({
+      messageValues: missingParams.join(", "),
+      sdkDetails: { clientId, orgId, scopes }
+    });
+  }
+  return credentials;
+}
+async function getAccessTokenByClientCredentials({ clientId, clientSecret, orgId, scopes = [], env }) {
+  const imsBaseUrl = getImsUrl(env);
+  const formData = new URLSearchParams();
+  formData.append("grant_type", "client_credentials");
+  formData.append("client_id", clientId);
+  formData.append("client_secret", clientSecret);
+  formData.append("org_id", orgId);
+  if (scopes.length > 0) {
+    formData.append("scope", scopes.join(","));
+  }
+  try {
+    const response = await fetch(`${imsBaseUrl}/ims/token/v2`, {
+      method: "POST",
+      headers: {
+        "Content-Type": "application/x-www-form-urlencoded"
+      },
+      body: formData.toString()
+    });
+    const data = await response.json();
+    if (!response.ok) {
+      const errorMessage = data.error_description || data.error || `HTTP ${response.status}`;
+      const xDebugId = response.headers.get("x-debug-id");
+      throw new codes.IMS_TOKEN_ERROR({
+        messageValues: errorMessage,
+        sdkDetails: {
+          statusCode: response.status,
+          statusText: response.statusText,
+          error: data.error,
+          errorDescription: data.error_description,
+          xDebugId,
+          clientId,
+          orgId,
+          scopes,
+          imsEnv: env
+        }
+      });
+    }
+    return data;
+  } catch (error) {
+    if (error.name === "AuthSDKError") {
+      throw error;
+    }
+    throw new codes.GENERIC_ERROR({
+      messageValues: error.message,
+      sdkDetails: {
+        originalError: error.message,
+        clientId,
+        orgId,
+        scopes,
+        imsEnv: env
+      }
+    });
+  }
+}
+
+// src/index.js
+var import_ttlcache = require("@isaacs/ttlcache");
+var import_crypto = __toESM(require("crypto"), 1);
+var tokenCache = new import_ttlcache.TTLCache({ ttl: 5 * 60 * 1e3 });
+function getCacheKey({ clientId, orgId, env, scopes, clientSecret }) {
+  const scopeKey = scopes.length > 0 ? scopes.sort().join(",") : "none";
+  return import_crypto.default.createHash("sha1").update(`${clientId}:${orgId}:${scopeKey}:${clientSecret}:${env}`).digest("hex");
+}
+function invalidateCache() {
+  tokenCache.clear();
+}
+async function generateAccessToken(params, imsEnv) {
+  imsEnv = imsEnv || (ioRuntimeStageNamespace() ? "stage" : "prod");
+  const credentials = getAndValidateCredentials(params);
+  const credAndEnv = { ...credentials, env: imsEnv };
+  const cacheKey = getCacheKey(credAndEnv);
+  const cachedToken = tokenCache.get(cacheKey);
+  if (cachedToken) {
+    return cachedToken;
+  }
+  const token = await getAccessTokenByClientCredentials(credAndEnv);
+  tokenCache.set(cacheKey, token);
+  return token;
+}
+function ioRuntimeStageNamespace() {
+  return process.env.__OW_NAMESPACE && process.env.__OW_NAMESPACE.startsWith("development-");
+}
+// Annotate the CommonJS export names for ESM import in node:
+0 && (module.exports = {
+  generateAccessToken,
+  invalidateCache
+});
diff --git a/package.json b/package.json
index 6276074..45771d0 100644
--- a/package.json
+++ b/package.json
@@ -3,17 +3,23 @@
   "version": "1.0.0",
   "description": "Adobe I/O Core Authentication Library",
   "type": "module",
-  "main": "src/index.js",
+  "main": "cjs/index.cjs",
   "types": "types.d.ts",
   "exports": {
     ".": {
       "import": "./src/index.js",
-      "types": "./types.d.ts",
-      "require": "./src/index.js",
-      "default": "./src/index.js"
+      "require": "./cjs/index.cjs"
     }
   },
+  "files": [
+    "src",
+    "cjs",
+    "types.d.ts"
+  ],
+  "pre-commit": "pre-commit",
   "scripts": {
+    "build": "node scripts/build-cjs.js",
+    "pre-commit": "npm run build && git add cjs",
     "test": "vitest run --coverage",
     "lint": "eslint src test",
     "generate-docs": "jsdoc2md src/*.js > doc/api.md"
@@ -42,6 +48,8 @@
     "node": ">=20"
   },
   "devDependencies": {
+    "esbuild": "^0.24.0",
+    "@fastify/pre-commit": "^2.2.0",
     "@adobe/eslint-config-aio-lib-config": "^3.0.0",
     "@vitest/coverage-v8": "^2.1.8",
     "eslint": "^8.57.0",
diff --git a/scripts/build-cjs.js b/scripts/build-cjs.js
new file mode 100644
index 0000000..ee1e971
--- /dev/null
+++ b/scripts/build-cjs.js
@@ -0,0 +1,33 @@
+/*
+Copyright 2025 Adobe. All rights reserved.
+This file is licensed to you 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 REPRESENTATIONS
+OF ANY KIND, either express or implied. See the License for the specific language
+governing permissions and limitations under the License.
+*/
+
+import * as esbuild from 'esbuild'
+import { mkdirSync, existsSync } from 'fs'
+import { dirname, join } from 'path'
+import { fileURLToPath } from 'url'
+
+const __dirname = dirname(fileURLToPath(import.meta.url))
+const root = join(__dirname, '..')
+const outDir = join(root, 'cjs')
+
+if (!existsSync(outDir)) {
+  mkdirSync(outDir, { recursive: true })
+}
+
+await esbuild.build({
+  entryPoints: [join(root, 'src', 'index.js')],
+  bundle: true,
+  format: 'cjs',
+  platform: 'node',
+  target: 'node20',
+  outfile: join(outDir, 'index.cjs'),
+  external: ['@adobe/aio-lib-core-errors', '@isaacs/ttlcache']
+})