How to add prefix to all node / express routes

You can use the express Router() for this.

You can use the router like you would use your express app. So for example:

router.use(() => {}); // General middleware
router.get('/route1', () => {})
router.get('/route2', () => {})
router.post('/route2', () => {})

And then attach the router to your express app using:

app.use('/prefix', router);

https://expressjs.com/en/4x/api.html#router

routes.js

module.exports = (app) => {
   app.post('/route', (req, res) => {
      res.status(status);
      res.send(data);
   }); 

   app.get('/route', (req, res) => {
      res.status(status);
      res.send(data);
   }); 

   return app; 
};

Server.js

const router = express.Router()
const routes = require('./routes')(router, {});
app.use('/PREFIX_HERE', routes)

REFER : https://expressjs.com/en/guide/using-middleware.html