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JavaScript REST APIs with Express Managing Data and Asynchronous Code Async/Await in Express

erkany
erkany
7,189 Points
Posted by erkany
erkany
7,189 Points

Why we can't use async/await directly in getQuotes in records.js?

Like below;

function getQuotes(){
  return new Promise((resolve, reject) => {
    fs.readFile('data.json', 'utf8', async (err, data) => {
      if (err) {
        reject(err);
      } else {
        const json = await JSON.parse(data);
        resolve(json);
      }
    });
  });
}
Zimri Leijen
Zimri Leijen
11,835 Points

I am not quite sure what you're trying to achieve here, and what isn't working.

2 Answers

Michael Cook
.a{fill-rule:evenodd;}techdegree seal-36
Michael Cook
Full Stack JavaScript Techdegree Graduate 28,975 Points

I don't see why you can't write this function with async/await. 

require('fs').promises;

async function getQuotes() {
  try {
    const data = await fs.promises.readFile('data.json', 'utf8');
    return JSON.parse(data);
  } catch (err) {
    console.error(err.message);
    // whatever else you want to do here
  }
}

Based on my research since node 11 something you can use the fs.promises module to use asynchronous file system functions that return promises rather than using callbacks. Check out the docs here

Brian Wright
Brian Wright
6,770 Points
Brian Wright
Brian Wright
6,770 Points

The reason for not using async/await inside the getRecords functions is that the idea is to mimic the return of data from a database. getRecords() is trying to replicate the action of getting the records from a database so the function does not return the data immediately.