ctx.body = {
  data: {
    name: 'test'
  },
  status: {
    code: 0,
    message: success
  }
}

npm install koa2-response

const koa = require('koa');
const router = require('koa-router')();
const app = new koa();
const response = require('koa2-response');

const code = {
 UNKNOWN_ERROR: [1, 'Sorry, you seem to have encountered some unknown errors.']
}

router
 .get('/', (ctx, next) => {
  response.success(ctx, {
   name: 'test'
  })
 })
 .get('/error_test', (ctx, next) => {
  response.error(ctx, code.UNKNOWN_ERROR);
 })

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

app.listen(3000);