Code changes required to start the migration of an Express application to Fastify

express-to-fastify-migration.diff

diff --git a/api-after/package.json b/api-after/package.json
index 8efee6f..f51a9c8 100644
--- a/api-after/package.json
+++ b/api-after/package.json
@@ -11,6 +11,9 @@
   "license": "MIT",
   "dependencies": {
     "cors": "^2.8.5",
-    "express": "^4.17.1"
+    "express": "^4.17.1",
+    "fastify": "^3.13.0",
+    "fastify-express": "^0.3.2"
   }
 }
diff --git a/api-after/src/server.js b/api-after/src/server.js
index 22a692e..156553e 100644
--- a/api-after/src/server.js
+++ b/api-after/src/server.js
@@ -1,14 +1,17 @@
 // src/server.js
 
-import express from "express";
+import Fastify from "fastify";
+import ExpressPlugin from "fastify-express";
 
 import config from "./config.js";
 import routes from "./routes.js";
 
-const app = express();
+const fastify = Fastify({
+       logger: true
+});
 
-app.use("/user", routes);
+await fastify.register(ExpressPlugin);
 
-const server = app.listen(3000, () => {
-       console.log(`Example app listening at http://localhost:${server.address().port}`);
-});
+fastify.use("/user", routes);
+
+fastify.listen(3000);