feat: create basic express server with swagger documentation

src/app.ts

@@ -0,0 +1,25 @@
+import * as express from 'express';
+import router from './routes';
+
+const app = express();
+
+const swaggerJsdocOpts = {
+	failOnErrors: true,
+	definition: {
+		openapi: '3.0.0',
+		info: {
+			title: 'kittyurl',
+			version: '0.0.1'
+		}
+	},
+	apis: ['./src/routes/*.ts']
+};
+const swaggerUi = require('swagger-ui-express');
+const swaggerJsdoc = require('swagger-jsdoc');
+const swaggerSpec = swaggerJsdoc(swaggerJsdocOpts);
+
+app.use(express.json());
+app.use(router);
+app.use('/swagger', swaggerUi.serve, swaggerUi.setup(swaggerSpec));
+app.listen(6567, () => console.log('(HTTP Server) Listening on port 6567.'));
+

src/routes/index.ts

@@ -0,0 +1,20 @@
+import { Router } from 'express';
+
+const router = Router();
+
+/**
+ * @swagger
+ *
+ * /:
+ *   get:
+ *     description: Hello world!
+ *     tags: [Default]
+ *     responses:
+ *       200:
+ *         description: Returns "Hello world!"
+ */
+router.get('/', (req, res) => {
+	res.send("Hello world!");
+});
+
+export default router;