npm install express-api-version-manager 

 app.use('/api/:apiVersion', apiVersionManager({ apiVersionParamName: 'apiVersion', versions: { v1: { router: routerApiV1 }, v2: { router: routerApiV2 }, v3: { router: routerApiV3 } } })); 

const express = require('express'); const apiVersionManager = require('./../index'); const app = express(); const routerApiV1 = express.Router(); const routerApiV2 = express.Router(); const routerApiV3 = express.Router(); app.use('/api/:apiVersion', apiVersionManager({ apiVersionParamName: 'apiVersion', versions: { v1: { router: routerApiV1 }, v2: { router: routerApiV2 }, v3: { router: routerApiV3 } } })); //call api/v1/user response -> user1 routerApiV1.get('/user', (req, res) => res.send('user1')); //call api/v2/user response -> user2 routerApiV2.get('/user', (req, res) => res.send('user2')); //call api/v3/user response -> user3 routerApiV3.get('/user', (req, res) => res.send('user3')); //call api/v1/admin response -> admin //call api/v2/admin response -> admin //call api/v3/admin response -> admin //because v2 and v3 inherit from v1 routerApiV1.get('/admin', (req, res) => res.send('admin'));