diff --git a/__tests__/server.spec.ts b/__tests__/server.spec.ts
index 8fd95dd..5d1bd9d 100644
--- a/__tests__/server.spec.ts
+++ b/__tests__/server.spec.ts
@@ -11,6 +11,13 @@ describe('server', () => {
     });
   });
 
+  it('responds uppercase', done => {
+    jsonist.get(urlBase + '/uppercase?msg=hello', (_, body) => {
+      expect(body.msg).toEqual('HELLO');
+      done();
+    });
+  });
+
   afterAll(async () => {
     server.close();
   });
diff --git a/src/server.ts b/src/server.ts
index d053a65..01a24ac 100644
--- a/src/server.ts
+++ b/src/server.ts
@@ -5,10 +5,16 @@ function handleHelloWorld(_: Request, res: Response) {
   res.json({ msg: 'Hello, world' });
 }
 
+function handleUppercase(req: Request, res: Response) {
+  const message = req.query.msg || 'no message given';
+  res.json({ msg: message.toUpperCase() });
+}
+
 const app = express();
 app.set('port', process.env.PORT || 3000);
 
 app.get('/', handleHelloWorld);
+app.get('/uppercase', handleUppercase);
 
 const server = app.listen(app.get('port'), () => {
   console.log('App is running at http://localhost:%d', app.get('port'));