Proper async/await function - node.js

Question

I am attempting to run a bot that scrapes Amazon (using amazon-buddy) for certain products (using array of ASINs) and checks the price. If the price is not 0, it should be sending a message on discord. I currently have this set to run every 30 seconds and it's working, but there are times where it seems like each element is not waiting for the previous one to get a response in the forEach loop and my function doesn't seem to be correct (I'm still trying to understand async/await functions properly).
Is there a better way to run this so that each element waits for the previous element to get scraped before moving on to the next one and THEN run the loop again after 30 seconds?
(function() {
var c = 0;
var timeout = setInterval(function() {
const checkStock = (async () => {
config.items.itemGroup.forEach(element => {
console.log('Checking stock on ' + element)
try {
const product_by_asin = await amazonScraper.asin({ asin: element });
console.log(product_by_asin)
const price = product_by_asin.result[0].price.current_price
const symbol = product_by_asin.result[0].price.symbol
const asin = product_by_asin.result[0].asin
const title = product_by_asin.result[0].title
const url = product_by_asin.result[0].url
const image = product_by_asin.result[0].main_image
if (price != 0) {
const inStockResponse = {
color: 0x008000,
title: title + ' is in stock!',
url: url,
author: {
name: config.botName,
icon_url: config.botImg,
url: config.botUrl
},
description: '<#767456705306165298>, click the tite to go purchase!\n\n' +
'Price: ' + symbol + price,
thumbnail: {
url: image
},
timestamp: new Date()
}
message.channel.send({embed: inStockResponse });
console.log(title + ' (' + asin + ') IS available!')
} else {
console.log(title + ' (' + asin + ') IS NOT available!')
}
} catch (error) {
console.log(error);
}
});
checkStock()
});
console.log('Counter: ' + c)
c++;
}, 30000);
})();

Answer 1

You could use a for...of loop which can wait for each iteration to finish:
async function checkItems(items) {
// Check all items, wait for each to complete.
for (const item of items) {
try {
const product_by_asin = await amazonScraper.asin({ asin: item });
console.log(product_by_asin);
const price = product_by_asin.result[0].price.current_price;
const symbol = product_by_asin.result[0].price.symbol;
const asin = product_by_asin.result[0].asin;
const title = product_by_asin.result[0].title;
const url = product_by_asin.result[0].url;
const image = product_by_asin.result[0].main_image;
if (price != 0) {
const inStockResponse = {
color: 0x008000,
title: title + " is in stock!",
url: url,
author: {
name: config.botName,
icon_url: config.botImg,
url: config.botUrl,
},
description:
"<#767456705306165298>, click the tite to go purchase!\n\n" +
"Price: " +
symbol +
price,
thumbnail: {
url: image,
},
timestamp: new Date(),
};
// NOTE: you might want to wait for this too, the error
// currently isn't being handled like this either.
message.channel.send({ embed: inStockResponse });
console.log(title + " (" + asin + ") IS available!");
} else {
console.log(title + " (" + asin + ") IS NOT available!");
}
} catch (err) {
console.log(err);
}
}
// Wait 30s and check again.
setTimeout(() => checkItems(items), 30000);
}
checkItems(config.items.itemGroup);