Update Express to v5.0.0 and fix route parameter compatibility (#16)

- Update Express dependency from ^4.19.2 to ^5.0.0
- Replace optional route parameter syntax (:count?) with separate routes for Express v5 compatibility
- Refactor batch endpoint to use handleBatchRequest helper function
- Add dedicated routes for /batch/:type/:count and /batch/:type
- All tests passing with Express v5

Author: mcollina

examples/express-benchmark-app.js

@@ -294,8 +294,8 @@ app.get('/mixed', (req, res) => {
   }
 })
 
-// Batch endpoint - runs multiple operations of the same type
-app.get('/batch/:type/:count?', (req, res) => {
+// Helper function for batch processing
+function handleBatchRequest (req, res) {
   const { type, count = 5 } = req.params
   const batchCount = Math.min(Math.max(parseInt(count), 1), 20) // Limit between 1-20
 
@@ -350,7 +350,13 @@ app.get('/batch/:type/:count?', (req, res) => {
       timestamp: new Date().toISOString()
     })
   }
-})
+}
+
+// Batch endpoint - runs multiple operations of the same type (with count)
+app.get('/batch/:type/:count', handleBatchRequest)
+
+// Batch endpoint - runs multiple operations of the same type (default count)
+app.get('/batch/:type', handleBatchRequest)
 
 // Root endpoint - provides API documentation
 app.get('/', (req, res) => {

package.json

@@ -50,7 +50,7 @@
     "compression": "^1.7.4",
     "cors": "^2.8.5",
     "eslint": "^9.0.0",
-    "express": "^4.19.2",
+    "express": "^5.0.0",
     "helmet": "^8.0.0",
     "light-my-request": "^6.6.0",
     "morgan": "^1.10.0",