REST API with koa2. Common prefix for several routers - koa

Question

I have two entities, users and employees. So I want CRUD for both in different endpoints, but both of them will be mounted under "api", so I can define api_v1, api_v2 and so on.
The endpoints would be something like:
get api/users
put api/users/12
delete api/users/12
get api/employees
....
I can't get "api" prefix for both of my routes. Can't get it working with koa-mount.
My files:
server.js
// Dependencies
import Koa from 'koa'
import mongoose from 'mongoose'
import logger from 'koa-logger'
// import parser from 'koa-bodyparser';
import convert from 'koa-convert'
import serve from 'koa-static'
import Router from 'koa-router'
import session from 'koa-generic-session'
import mount from 'koa-mount'
// A seperate file with my routes.
import routingUsers from './users'
import routingEmployees from './employees'
// config
const config = require("./config/config")
// connect to the database
mongoose.connect(config.mongo.url)
mongoose.connection.on('error', console.error)
// Creates the application.
const app = new Koa()
// how to use koa-mount to make this work? Arghhhhh!
// const api = new Koa();
// api.use(convert(mount ('/api', app)))
// trust proxy
app.proxy = true
// sessions
app.keys = ['your-session-secret']
// Applies all routes to the router.
const user = routingUsers(Router())
const employee = routingEmployees(Router())
app
.use(logger()) // log requests, should be at the beginning
.use(user.routes()) // asign routes
.use(employee.routes()) // asign routes
.use(user.allowedMethods())
.use(employee.allowedMethods())
.use(convert(session())) // session not needed for an API??????
.use(convert(serve(__dirname + '/public'))) // for static files like images
// Start the application.
app.listen(3000, () => console.log('server started 3000'))
export default app
users.js (employees.js is the same).
// Export a function that takes the router
export default router => {
// Set a prefix of our api, in this case locations
const api = 'users'
router.prefix(`/${api}`);
// GET to all locations.
router.get('/', (ctx, next) =>
ctx.body = 'hello users');
// ctx.body = await Location.find());
// POST a new location.
router.post('/', async (ctx, next) =>
ctx.body = await new Location(ctx.request.body).save());
// Routes to /locations/id.
router.get('/:id', async (ctx, next) =>
ctx.body = await Location.findById(ctx.params.id));
// PUT to a single location.
router.put('/:id', async (ctx, next) =>
ctx.body = await Location.findByIdAndUpdate(ctx.params.id, ctx.body));
// DELETE to a single location.
router.delete('/:id', async (ctx, next) =>
ctx.body = await Location.findByIdAndRemove(ctx.params.id));
return router;
}

Answer 1

I use the following solution:
import Router from 'koa-router';
const router = new Router()
.get('/', function(ctx) {
ctx.body = 'Index';
});
const apiRouter = new Router({
prefix: '/api'
})
.get('/templates', Templates.index)
.post('/templates', Templates.store)
.put('/templates', Templates.update)
.get('/lists', Lists.index);
router.use(apiRouter.routes());

Answer 2

Finally I've sent another parameter to the routers modules, so I used router prefix:
// Applies all routes to the router.
const user = routingUsers(Router(), 'api/users/')
const employee = routingEmployees(Router(), 'api/employees/')
Users would be:
export default (router, prefix) => {
// Set a prefix of our api, in this case locations
// const api = 'users'
router.prefix(`/${prefix}`);
....