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src/config/env.js

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+// env.js
+import dotenv from "dotenv";
+
+dotenv.config();
+
+// Validate required env vars
+const required = ["PORT", "GOOGLE_APPLICATION_CREDENTIALS"];
+
+required.forEach((key) => {
+  if (!process.env[key]) {
+    console.error(`❌ Missing required environment variable: ${key}`);
+    process.exit(1);
+  }
+});
+
+export const env = {
+  port: process.env.PORT || 3000,
+  serviceAccountPath: process.env.GOOGLE_APPLICATION_CREDENTIALS,
+  nodeEnv: process.env.NODE_ENV || "development",
+};

src/config/firebase.js

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+// firebase.js
+import admin from "firebase-admin";
+import dotenv from "dotenv";
+import { readFileSync } from "fs";
+
+dotenv.config();
+
+// Prevent multiple initializations in dev mode (nodemon)
+if (!admin.apps.length) {
+  const serviceAccount = JSON.parse(
+    readFileSync(process.env.GOOGLE_APPLICATION_CREDENTIALS, "utf8")
+  );
+
+  admin.initializeApp({
+    credential: admin.credential.cert(serviceAccount),
+  });
+}
+
+const db = admin.firestore();
+const auth = admin.auth();
+
+export { admin, db, auth };