How to access these parameters of this object?

Question

How would I access the value of statusCode for example?

{
    res: IncomingMessage {
      statusCode: 200,
      statusMessage: '',
    }
}

@newprogrammer please update your questions with details, and that piece of code does not represent valid JavaScript. — Ghassen Louhaichi, Jul 02 '20 at 14:28

score 1 · Accepted Answer · answered Jul 02 '20 at 14:05

1

It depends on the initial object.

If outer brackets is valid then you can access it like property name:

object.res.statusCode

or you can do it by propertyName:

object['res']['statusCode']

If outer brackets is not valid and you wrote them just for wrapping up. Then you can access status code the same way, just without mentioning res.

answered Jul 02 '20 at 14:05

I always get 'TypeError: Cannot read property 'statusCode' of undefined' – newprogrammer Jul 02 '20 at 14:08
@newprogrammer https://stackoverflow.com/questions/8004617/javascript-cannot-read-property-bar-of-undefined – Liam Jul 02 '20 at 14:10

score 0 · Answer 2 · edited Jul 05 '20 at 22:42

0

Optional Chaining.

Not widely supported in older browsers:

data?.res?.statusCode

Using dot notation:

data.res && data.res.statusCode;

Using property access notation:

data['res'] && data['res']['statusCode']

Using ternary operator:

data['res'] ? data["res"]["statusCode"] : -1

edited Jul 05 '20 at 22:42

someone

answered Jul 05 '20 at 22:32

khizer

score -1 · Answer 3 · answered Jul 02 '20 at 14:03

-1

JSONObject.res.statusCode is a correct approach.

In case that you have something like this (Replace JSONObject with the name of your JSON) :

 let JSONObject = {
        res: IncomingMessage {
          statusCode: 200,
          statusMessage: ''
        }
    }

answered Jul 02 '20 at 14:03

Ognjen

You can't have a JSON Object... JSON is a string notation – Liam Jul 02 '20 at 14:05
1

Yes...That is what JSON means... It's still not an object. **Notation** as in text – Liam Jul 02 '20 at 14:06
[JavaScript Object Notation (JSON) is a standard **TEXT-BASED** format for representing structured data **BASED ON** JavaScript object syntax](https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Objects/JSON) – Liam Jul 02 '20 at 14:08

score -1 · Answer 4 · answered Jul 02 '20 at 14:07

-1

Your Object structure is wrong maybe you meant this

ob={ res:{ IncomingMessage :{ statusCode: 200,statusMessage: ''}}}
console.log(ob.res.IncomingMessage.statusCode)

answered Jul 02 '20 at 14:07

Sven.hig

2

why is the downvote!! can anyone explain to me what is wrong with the answer, I am all open to criticism. However downvoting without explaining why, makes no sense – Sven.hig Jul 02 '20 at 14:11

4 Answers4