improve error handling with koa-json-error

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

package.json

@@ -12,6 +12,7 @@
     "koa-bodyparser": "^4.2.1",
     "koa-joi-router": "^5.1.0",
     "koa-json": "^2.0.2",
+    "koa-json-error": "^3.1.2",
     "koa-logger": "^3.2.0",
     "lokijs": "^1.5.5",
     "nunjucks": "^3.1.4"

src/app.js

@@ -1,5 +1,6 @@
 import Koa from 'koa'
 import JSON from 'koa-json'
+import JsonError from 'koa-json-error'
 import JoiRouter from 'koa-joi-router'
 import BodyParser from 'koa-bodyparser'
 
@@ -7,9 +8,10 @@ const App = (ghc) => {
   const app = new Koa()
   const router = new JoiRouter()
 
-  app.use(router.middleware())
+  app.use(JSON({pretty: true}))
+     .use(JsonError())
+     .use(router.middleware())
      .use(BodyParser({onerror:console.error}))
-     .use(JSON({pretty: true}))
      
   app.on('error', (err, ctx) => {
     console.error('server error', err, ctx)