refacto: Keeping entrypoints clean and making files by purpose

server/app.js

@@ -0,0 +1,25 @@
+import express from "express";
+import path from "path";
+import { fileURLToPath } from "url";
+import authRouter from "./routes/auth.js";
+import gameRouter from "./routes/game.js";
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const publicDir = path.join(__dirname, "..", "public");
+
+const app = express();
+app.use(express.json());
+app.use(express.static(publicDir));
+
+app.use("/api/auth", authRouter);
+app.use("/api", gameRouter);
+
+// Catch-all: serve index.html for non-API routes (SPA fallback)
+app.get("*", (req, res) => {
+  if (req.path.startsWith("/api")) {
+    return res.status(404).json({ error: "not_found" });
+  }
+  res.sendFile(path.join(publicDir, "index.html"));
+});
+
+export default app;