How to use koa router to define a default?

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npm install koa koa-router

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const Koa = require('koa');
const Router = require('koa-router');

const app = new Koa();
const router = new Router();

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// Define your default route
router.get('/', (ctx, next) => {
  ctx.body = 'Default route';
});

// Define other routes
router.get('/users', (ctx, next) => {
  ctx.body = 'Users route';
});
router.get('/products', (ctx, next) => {
  ctx.body = 'Products route';
});

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router.get('(.*)', (ctx, next) => {
  ctx.body = 'Invalid route';
});

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app
  .use(router.routes())
  .use(router.allowedMethods());

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app.listen(3000, () => {
  console.log('Server running on port 3000');
});