How to write native Nodejs async https request code - node.js

Question

I have copied the very good code from https://www.tomas-dvorak.cz/posts/nodejs-request-without-dependencies/ to make a http request in nodejs using native modules.
I want to be able to use the data value later on in the script.
I know this is a common issue with newbies and async code, i just CANNOT understand this yet and have struggled for weeks to get it.
I have coped much code, watched youtube, talked to people, its flippen hard..
const getContent = function(url) {
return new Promise((resolve, reject) => {
const https = require('https')
const request = https.get(url, (response) => {
// handle http errors
if (response.statusCode < 200 || response.statusCode > 299) {
reject(new Error('Failed to load page, status code: ' + response.statusCode));
}
// temporary data holder
const body = [];
// on every content chunk, push it to the data array
response.on('data', (chunk) => body.push(chunk));
// we are done, resolve promise with those joined chunks
response.on('end', () => resolve(body.join('')));
});
// handle connection errors of the request
request.on('error', (err) => reject(err))
})
}
getContent('https://myapi/json')
.then((data) => console.log(data))
.catch((err) => console.error(err))
// I want to use the "data" value down here in my script. I want to do things with the "data" value like JSON.parse(data)
console.log(data) //undefined
let json = JSON.parse(data) //undefined
console.log('after')
my result for data is undefined
How can i use data down here below all the code above?

Answer 1

You can setup a callback and access your data within this callback, this pattern should be easy enough to use.
getContent('https://myapi/json')
.then(useData)
.catch((err) => console.error(err))
// Use this callback to do what you want with your data!
function useData(data) {
console.log(data);
let json = JSON.parse(data);
}
Or using async / await ( this might be more intuitive!):
async function testAwait() {
let data = await getContent('https://myapi/json');
console.log("data: ", data);
}
testAwait();