How to Parse JSON array in node js

Question

I was trying below code,where body is response from HTTP GET. When I tried to run it, I am getting below error.

Cannot read property 'po_number' of undefined

{
 "d": {
 "results": [
 {
 "po_number": "PO1001",
 "product_id": "PD1001",
 "message": "Exists",
 "timestamp": "2016-05-01" 
 }
 ]
 }
}

How to access po_number

var profile = JSON.parse(body);
console.log("profile: "+ profile.results.po_number);

I am getting undefined when i access above code

• Titus: profile.results it's an array not an object, you have to use something like profile.results[index].po_number, profile.results[0].po_number for example.

Answer 1

You missed one step. You missed the object d and that the results is an array. So first access the 0 indexed item.

You need to get via profile.d.results[0].po_number.

const jsonObj = `{ "d": {
 "results": [
 {
 "po_number": "PO1001",
 "product_id": "PD1001",
 "message": "Exists",
 "timestamp": "2016-05-01" 
 }]
}}`;
var profile = JSON.parse(jsonObj);
console.log(profile.d.results[0].po_number);

Answer 2

results is an array.

To access po_number, you'll need to do something like:

console.log("profile: "+ profile.results[0].po_number)

Make sure you dynamically iterate the array to access that value.

Example (in underscore/lodash) :

_.each(profile.results, (result) => { 
 console.log("profile: " + result.po_number);
});

Answer 3

var profile = JSON.parse(JSON.stringify(data[0]))
console.log("profile: "+ profile.po_number)

• Andy: Why would you stringify the data then parse it?