How to use async and await in koa?

by jasen_gottlieb , in category: Javascript , a month ago

How to use async and await in koa?

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1 answer

by scotty_walker , a month ago

@jasen_gottlieb 

To use async and await in Koa, you can define your routes and middleware functions using the async keyword, and use the await keyword when calling asynchronous functions.


Here is an example of how to use async and await in a Koa application:

  1. Install Koa using npm:
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npm install koa


  1. Create a Koa application and define a simple route that uses async/await:
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const Koa = require('koa');
const app = new Koa();

// Define a route using async/await
app.use(async (ctx) => {
  const result = await fetch('https://jsonplaceholder.typicode.com/posts');
  const data = await result.json();

  ctx.body = data;
});

app.listen(3000, () => {
  console.log('Server is running on http://localhost:3000');
});


In this example, we define a route that uses the fetch API to make a GET request to a JSON API. We use async/await to handle the asynchronous nature of the fetch API, and then set the response body to the data returned from the API.

  1. Start the Koa application:
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node app.js


Now you can access the route defined in the example by visiting http://localhost:3000 in your browser. The Koa application will use async/await to handle asynchronous operations and serve the requested data.