Fix: Add type validation for sendStatus to prevent BigInt serialization error (#6756)

lib/response.js

@@ -62,6 +62,10 @@ module.exports = res
  */
 
 res.status = function status(code) {
+  // Prevent BigInt serialization error
+  if (typeof code !== 'number') {
+    throw new TypeError(`Invalid status code: ${code} (${typeof code}). Status code must be a number.`);
+  }
   // Check if the status code is not an integer
   if (!Number.isInteger(code)) {
     throw new TypeError(`Invalid status code: ${JSON.stringify(code)}. Status code must be an integer.`);

test/res.status.js

@@ -200,6 +200,18 @@ describe('res', function () {
           .get('/')
           .expect(500, /Invalid status code/, done);
       });
+
+      it('should raise error for BigInt status code', function (done) {
+        var app = express()
+
+        app.use(function (req, res) {
+          res.status(200n).end()
+        })
+
+        request(app)
+          .get('/')
+          .expect(500, /Invalid status code/, done)
+      })
     });
   });
 });