feat: koa

.gitignore

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+.DS_Store
+node_modules
+/dist
+
+
+# local env files
+.env.local
+.env.*.local
+
+# Log files
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+
+# Editor directories and files
+.idea
+.vscode
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?

package.json

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+{
+  "name": "koa-study",
+  "version": "0.1.0",
+  "private": true,
+
+  "dependencies": {
+    "debug": "^4.1.1",
+    "koa": "^2.7.0",
+    "koa-bodyparser": "^4.2.1",
+    "koa-convert": "^1.2.0",
+    "koa-json": "^2.0.2",
+    "koa-logger": "^3.2.0",
+    "koa-onerror": "^4.1.0",
+    "koa-router": "^7.4.0",
+    "koa-static": "^5.0.0",
+    "koa-views": "^6.2.0",
+    "pug": "^2.0.3"
+  },
+  "devDependencies": {
+    "nodemon": "^1.19.1"
+  }
+}

public/stylesheets/style.css

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+body {
+  padding: 50px;
+  font: 14px "Lucida Grande", Helvetica, Arial, sans-serif;
+}
+
+a {
+  color: #00B7FF;
+}

src/app.js

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+const Koa = require('koa')
+const app = new Koa()
+const views = require('koa-views')
+const json = require('koa-json')
+const onerror = require('koa-onerror')
+const bodyparser = require('koa-bodyparser')
+const logger = require('koa-logger')
+
+const index = require('./routes/index')
+const users = require('./routes/users')
+
+// error handler
+onerror(app)
+
+// middlewares
+app.use(bodyparser({
+  enableTypes:['json', 'form', 'text']
+}))
+app.use(json())
+app.use(logger())
+app.use(require('koa-static')(__dirname + '/public'))
+
+app.use(views(__dirname + '/views', {
+  extension: 'pug'
+}))
+
+// logger
+app.use(async (ctx, next) => {
+  const start = new Date()
+  await next()
+  const ms = new Date() - start
+  console.log(`${ctx.method} ${ctx.url} - ${ms}ms`)
+})
+
+// routes
+app.use(index.routes(), index.allowedMethods())
+app.use(users.routes(), users.allowedMethods())
+
+// error-handling
+app.on('error', (err, ctx) => {
+  console.error('server error', err, ctx)
+});
+
+module.exports = app

src/routes/index.js

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+const router = require('koa-router')()
+
+router.get('/', async (ctx, next) => {
+  await ctx.render('index', {
+    title: 'Hello Koa 2!'
+  })
+})
+
+router.get('/string', async (ctx, next) => {
+  ctx.body = 'koa2 string'
+})
+
+router.get('/json', async (ctx, next) => {
+  ctx.body = {
+    title: 'koa2 json'
+  }
+})
+
+router.post('/test', async (ctx, next) => {
+  ctx.body = {data : {msg: 'hello world'}}
+})
+
+module.exports = router

src/routes/users.js

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+const router = require('koa-router')()
+
+router.prefix('/users')
+
+router.get('/', function (ctx, next) {
+  ctx.body = 'this is a users response!'
+})
+
+router.get('/bar', function (ctx, next) {
+  ctx.body = 'this is a users/bar response'
+})
+
+module.exports = router