How can I filter nested objects with unknown keys?

Question

I'd like to create a new array with information filtered from a nested object with unknown keys.

The data comes from CUPS API and the keys are printer names. I'd like to filter on for example 'printer-state' === 3.

const data = {
    'Expedition': {
        'printer-is-shared': false,
        'printer-state': 4,
        'printer-state-message': '',
        'printer-state-reasons': ['none'],
    },
    'Serverroom': {
        'printer-is-shared': false,
        'printer-state': 3,
        'printer-state-message': '',
        'printer-state-reasons': ['none'],
    }
}

Thanks

I've tried Array.filter() but couldn't get it to work.

What did you try that did not work? And Java !== JavaScript `Object.entries(data).filter()` — epascarello, Sep 09 '22 at 12:43
this is an Object and not an Array you can not perform a filter method — Taha Azzabi, Sep 09 '22 at 12:44
What is the output you want from above object, there is no matter what you are using rather focusing on any specific methiod. — Jay Patel, Sep 09 '22 at 12:46
As Id written it up by the time it was closed https://jsfiddle.net/w1bkvcts/ — Jamiec, Sep 09 '22 at 12:47

score 0 · Accepted Answer · answered Sep 09 '22 at 12:48

0

    const data = {
    'Expedition': {
        'printer-is-shared': false,
        'printer-state': 4,
        'printer-state-message': '',
        'printer-state-reasons': ['none'],
    },
    'Serverroom': {
        'printer-is-shared': false,
        'printer-state': 3,
        'printer-state-message': '',
        'printer-state-reasons': ['none'],
    }
}
const filterObjectByKeyValue = (obj, key, value) => {
      return Object.keys(obj)
        .filter(k => obj[k][key] === value)
        .reduce((res, k) => ((res[k] = obj[k]), res), {});
};

console.log(filterObjectByKeyValue(data,'printer-state',3))

answered Sep 09 '22 at 12:48

Taha Azzabi

2,392
22
31

This worked great, thanks! However can you explain how the reduce function works? – Tom van den Broek Sep 09 '22 at 13:59
Also, How would one return an array instead of an object with the filter results? – Tom van den Broek Sep 09 '22 at 14:28

How can I filter nested objects with unknown keys?

1 Answers1