Server Side development with Node.js and Koa.js Quick Start Guide

Introducing await

The await keyword helps us manage promises in a more procedural manner. The await keyword can be only used inside an async (asynchronous) function to resolve a promise. It helps us resolve promises just like the .then() function we saw earlier. Async... await is the cleanest way to control the flow of a modern asynchronous JavaScript application. An example can be seen here:

async function getPostCategory() {  const postId = 123;  const post = await Post.findById(postId);  return post.category;}

The preceding code block is essentially the same as the one shown here, using the .then() function:

function getPostCategory() {  const postId = 123;  return Post.findById(postId).then(post => {    return post.category;  });}

Note: The ...