How to set Koa HTTP response code

In order to set the HTTP response code using Koa, use ctx.status = ...

ctx.status = 403;

Full example:

const Koa = require("koa");

const app = new Koa();

app.use(async (ctx, next) => {
  ctx.status = 403;
  ctx.body = "Forbidden";
});

app.listen(3000);