How to set up Next.js render in Express routing?

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app.js

const express = require('express');
const next = require('next');
const port = parseInt(process.env.PORT, 10) || 3000;
const dev = process.env.NODE_ENV !== 'production';

const app = next({ dev });
const handle = app.getRequestHandler();

app
  .prepare()
  .then(() => {
    const server = express();

    const indexRouter = require('./routes/indexRouter');

    server.use(indexRouter);
    server.all('*', (req, res) => {
      return handle(req, res);
    });

    server.listen(port, (err) => {
      if (err) throw err;
      console.log('> Ready on http://localhost:' + port);
    });
  })
  .catch((ex) => {
    console.error(ex.stack);
    process.exit(1);
  });

indexRoutes.js

const express = require('express');
const router = express.Router();
const userController = require('../controllers/user');

router.post('/api/signup', userController.signup);

I want to render the component via Next.js in indexRoutes.js. I've seen others do in the main app.js.

server.get('/login', (req, res) => {
  app.render(req, res, '/login');
});

But I don't understand how I can do it in a separate file. I tried to do this, but no result.

indexRoutes.js

const express = require('express');
const next = require('next');
const dev = process.env.NODE_ENV !== 'production';
const app = next({ dev });
const router = express.Router();
const userController = require('../controllers/user');

router.post('/api/signup', userController.signup);
router.get('/login', (req, res) => {
  return app.render(req, res, '/login'); // this does not work
});

How can I solve my problem?

next.js express node.js routes
1 Answers

If you want to put the routes in a separate file you can create the following indexRouter.js file:

// routes/indexRouter.js

const userController = require('../controllers/user');

const indexRouter = (server, app) => {
    server.post('/api/signup', userController.signup);
    server.get('/login', (req, res) => {
        return app.render(req, res, '/login');
    });
};

module.exports = indexRouter;

You can then require it from app.js and pass the server and app objects to it.

// app.js

// ...

app
    .prepare()
    .then(() => {
        const server = express();

        const indexRouter = require('./routes/indexRouter');

        indexRouter(server, app)
        
        server.all('*', (req, res) => {
            return handle(req, res);
        });

        server.listen(port, (err) => {
            if (err) throw err;
            console.log('> Ready on http://localhost:' + port);
        });
    })
    .catch((ex) => {
        console.error(ex.stack);
        process.exit(1);
    });
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