How to send response in koa.js with node?

@cali_green 

In Koa.js, you can send a response to the client by using the ctx object passed to the middleware function. Here is an example of sending a response with Koa.js:

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const Koa = require('koa');
const app = new Koa();

app.use(async (ctx) => {
  // Set the status code of the response
  ctx.status = 200;

  // Set the content type of the response
  ctx.type = 'application/json';

  // Set the body of the response
  ctx.body = { message: 'Hello, World!' };
});

app.listen(3000, () => {
  console.log('Server is running on port 3000');
});

In the code above, we set the status code of the response to 200, the content type to 'application/json', and the body of the response to an object with a message property. When you run this code and make a request to the server, you will receive a JSON response with the message 'Hello, World!'.