Node.js - render HTML

index.js

'use strict'

const { readFile } = require('fs')
const Koa = require('koa')
const Router = require('koa-router')
require('colors')

const app = new Koa()
const router = new Router()

const readFileThunk = function(src) {
  return new Promise(function (resolve, reject) {
    readFile(src, { 'encoding': 'utf8' }, function (err, data) {
      if(err) return reject(err)
      resolve(data)
    })
  })
}

router
  .get('/', async (ctx, next) => {
    const { method, url } = ctx.request
    console.log(`[${method}: ${url}]`.yellow)
    ctx.body = await readFileThunk(`${__dirname}/views/viewer.html`)
    await next()
  })

app
  .use(router.routes())
  .use(router.allowedMethods())

const server = app.listen('3000', '127.0.0.1', () => {
  const host = server.address().address
  const port = server.address().port
  console.log('listening at http://%s:%s', host, port)
})