code quality updates

src/index.js

@@ -1,10 +1,13 @@
+require('dotenv').config();
+
 const express = require('express');
 const helmet = require('helmet');
-const app = express();
-const PORT = process.env.PORT || 3000;
+const logger = require('./lib/logger');
+const api = require('./api');
 const version = require('./lib/version').version();
 
-const api = require('./api');
+const app = express();
+const PORT = process.env.PORT || 3000;
 
 app.use(helmet({
     crossOriginResourcePolicy: false,
@@ -12,7 +15,13 @@ app.use(helmet({
 
 app.use('/', api.router);
 
+// Central error handler – catches all unhandled errors
+// eslint-disable-next-line no-unused-vars
+app.use((err, req, res, next) => {
+  logger.error({ err, url: req.url }, 'Unhandled error');
+  res.status(err.status || 500).json({ error: err.message || 'Internal Server Error' });
+});
+
 app.listen(PORT, () => {
-  console.log(`[ ${new Date()} ] [ 🚀 BadgeDex version: ${version} ]`);
-  console.log(`[ ${new Date()} ] [ 🚀 BadgeDex API running at http://localhost:${PORT}/ ]`);
+  logger.info(`BadgeDex version ${version} listening on http://localhost:${PORT}/`);
 });