Extract data from nested JSON using Node JS - node.js

Question

I need to extract the text value of productid from order but unfortunately i haven't been able to traverse the JSON. Any ideas about how to traverse the nodes in Node JS the simplest way possible ?
{
"order": {
"PRD_SHIRT_048": {
"price": "40.99",
"productId": "PRD_SHIRT_048",
"quantity": "1"
},
"PRD_TOP_047": {
"price": "40.99",
"productId": "PRD_TOP_047",
"quantity": "1"
}
}
}

Answer 1

First of all, you need to decide where you want to extract the data from.
If it is from a file you need to import the file with for example the npm package 'fs'.
Example code:
const fs = require("fs");
const content = fs.readFileSync("content.json");
console.log("Output: \n" + content);
You can use axios to get the json data from a specific url. For example:
axios.get('yoururl')
.then((response) => {
// handle success
console.log(response);
})
.catch((error) => {
// handle error
console.log(error);
});
Then you have extracted the data successfully.
After that you can parse the json content with JSON.parse and that will return an object with all its content.
For example for your code:
const json = `{"order": {
"PRD_SHIRT_048": {
"price": "40.99",
"productId": "PRD_SHIRT_048",
"quantity": "1"
},
"PRD_TOP_047": {
"price": "40.99",
"productId": "PRD_TOP_047",
"quantity": "1"
}
}}`;
const obj = JSON.parse(json);
console.log(obj.order.PRD_SHIRT_048.productId);
If you want, you can iterate over the objects from the order object and get the product id from that.

Answer 2

If I understand your question correctly, you are looking to extract the productIds?
Here is a solution using vanilla javascript
const data = { order: { PRD_SHIRT_048: { price: '40.99', productId: 'PRD_SHIRT_048', quantity: '1' }, PRD_TOP_047: { price: '40.99', productId: 'PRD_TOP_047', quantity: '1' } } };
console.log(Object.keys(data.order));
// => [ 'PRD_SHIRT_048', 'PRD_TOP_047' ]
console.log(Object.values(data.order).map(({ productId }) => productId));
// => [ 'PRD_SHIRT_048', 'PRD_TOP_047' ]
.as-console-wrapper {max-height: 100% !important; top: 0}
Or if you need a more flexible solution (i.e. multiple different paths for the productId, nested productIds etc), you could consider using a library
// const objectScan = require('object-scan');
const data = { order: { PRD_SHIRT_048: { price: '40.99', productId: 'PRD_SHIRT_048', quantity: '1' }, PRD_TOP_047: { price: '40.99', productId: 'PRD_TOP_047', quantity: '1' } } };
console.log(objectScan(['order.*.productId'], { rtn: 'value' })(data));
// => [ 'PRD_TOP_047', 'PRD_SHIRT_048' ]
console.log(objectScan(['order.*'], { rtn: 'property' })(data));
// => [ 'PRD_TOP_047', 'PRD_SHIRT_048' ]
.as-console-wrapper {max-height: 100% !important; top: 0}
<script src="https://bundle.run/object-scan#13.8.0"></script>
Disclaimer: I'm the author of object-scan

Answer 3

const json = `{"order": {
"PRD_SHIRT_048": [
"price",
"productId",
"quantity"
],
"PRD_TOP_047": [
"price",
"productId",
"quantity"
]
}}`;
const obj = JSON.parse(json);
console.log(obj.order.PRD_SHIRT_048.productId);