get-value-by-key-json.js

function getValueByKeyJson(obj, key) {
    if (obj === null || typeof obj !== 'object') {
        return undefined;
    }

    if (obj.hasOwnProperty(key)) {
        return obj[key];
    }

    for (const property in obj) {
        if (obj.hasOwnProperty(property)) {
            const found = getValueByKeyJson(obj[property], key);
            if (found !== undefined) {
                return found;
            }
        }
    }
    return undefined;
}