You may have wondered what that ctx is in the minimal code we created in the previous section and where the req and res objects are, because they are there in the Express app. They are not gone in Koa. They are just encapsulated in a single object in Koa, which is the Koa context, referred to as ctx. We can access the request and response objects as follows:
app.use(async ctx => {
ctx.request
ctx.response
})
So, you can see that we can easily use ctx.request to access the Node.js request object and ctx.response for the Node.js response object. These two important HTTP objects are not gone in Koa! They are just tucked away in the Koa context – ctx. Next, let's find out how cascading works in Koa in the next section.
