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NodeJS Koa Framework v2

Hello World example

const Koa = require('koa')
const app = new Koa()
app.use(async ctx => {
 ctx.body = 'Hello World'

Handling errors using middleware

app.use(async (ctx, next) => {
 try {
 await next() // attempt to invoke the next middleware downstream
 } catch (err) {
 handleError(err, ctx) // define your own error handling function


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