Mounted Routers as Parametric Modules

api.js

const express = require('express')
const router = express.Router()

module.exports = (Knex) => {

  router.get('/', (req, res) => {
    // now you have Knex object in scope!
    res.render('main', { title: 'Main' })
  })

  return router
}

app.js

const Knex = "Pretend this is your knex object"

const api = require('./routes/api.js')(Knex)
app.use('/api', api)