add logger for development

Signed-off-by: Jakub Sokołowski <jakub@status.im>

package.json

@@ -8,6 +8,7 @@
     "async-redis": "^1.1.4",
     "koa": "^2.5.3",
     "koa-json": "^2.0.2",
+    "koa-logger": "^3.2.0",
     "koa-router": "^7.4.0"
   },
   "devDependencies": {

src/app.js

@@ -1,6 +1,7 @@
 import Koa from 'koa'
 import Router from 'koa-router'
 import JSON from 'koa-json'
+import Logger from 'koa-logger'
 
 import Counter from './counter'
 import Redis from 'async-redis'
@@ -15,6 +16,10 @@ const router = new Router()
 const redis = Redis.createClient(REDIS_PORT, REDIS_HOST)
 const counter = new Counter(redis)
 
+app.on('error', (err, ctx) => {
+  console.error('server error', err, ctx)
+});
+
 router.put('/clicks/:id', async ctx => {
     counter.incr(ctx.params.id)
     ctx.body = { [ctx.params.id]: await counter.state(ctx.params.id) }
@@ -28,7 +33,8 @@ router.get('/clicks/:id', async ctx => {
     ctx.body = { [ctx.params.id]: await counter.state(ctx.params.id) }
 });
 
-app.use(JSON({pretty: true}))
+app.use(Logger())
+   .use(JSON({pretty: true}))
    .use(router.routes())
    .use(router.allowedMethods())