Reducing the function that filters the JS object

I have a JS object like this:

{"field1":1,"field3":14,"category":9,"completion":null,"creation":"23-04-26", "settings":"[{"ip":""}]"}

I would like to create a function which returns such object without field which is string-array "settings":"[{"ip":""}]" and if this array contains only one element and if this object contains only one key-value pair with value of empty string.

Desired result is:

{"field1":1,"field3":14,"category":9,"completion":null,"creation":"23-04-26"}

Arrays not to be filtered:

{"field1":1,"field3":14,"category":9,"completion":null,"creation":"23-04-26", "settings":"[{"ip":"33333not empty"}]"}

or:

{"field1":1,"field3":14,"category":9,"completion":null,"creation":"23-04-26", "settings":"[{"ip":"345", "dns": "address"}]"}

I wrote the following function:

    function filterArrayFields(values) {
const result = {};
const fieldNames = Object.keys(values);
fieldNames.forEach((fieldName) => {
if (typeof values[fieldName] !== 'string') {
result[fieldName] = values[fieldName];
return;
}
try {
const parsedValue = JSON.parse(values[fieldName]);
if (!Array.isArray(parsedValue)) {
result[fieldName] = values[fieldName];
return;
}
if (Array.isArray(parsedValue) && parsedValue.length > 1) {
result[fieldName] = values[fieldName];
return;
}
if (Array.isArray(parsedValue) && parsedValue.length === 1) {
const arrayTypeFieldValue = parsedValue[0];
const [arrayTypeFieldValueName] = Object.keys(arrayTypeFieldValue);
if (arrayTypeFieldValue[arrayTypeFieldValueName] !== '') {
result[fieldName] = values[fieldName];
return;
}
}
} catch (error) {
result[fieldName] = values[fieldName];
}
});
return result;
}

This method is working correctly but it looks like that it is overloaded buy if-s or extra conditions. Is it possible to optimize this function anyhow?

Edit: our target field can have any name, not only 'settings' - 'settings' here is just an example

I think you could tighten this up significantly by shallow-cloning the input object via the spread operator and conditionally merging the settings back in only if it meets your criteria.

The criteria testing could be handled by a separate dedicated function. Something like this:

<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-js -->

function stripEmptySettings (obj) {
const { settings, ...rest } = obj;
return {
...rest,
...stripSettings(JSON.parse(settings)),
}
}
function stripSettings (settings) {
if (
settings?.length === 1
&& Object.keys(settings[0]).length === 1
&& Object.values(settings[0]).every(v => v === '')
) {
return;
}
return {settings};
}
const inputs = [
{"field1":1,"field3":14,"category":9,"completion":null,"creation":"23-04-26", "settings":"[{\"ip\":\"\"}]"},
{"field1":1,"field3":14,"category":9,"completion":null,"creation":"23-04-26", "settings":"[{\"ip\":\"33333not empty\"}]"},
{"field1":1,"field3":14,"category":9,"completion":null,"creation":"23-04-26", "settings":"[{\"ip\":\"345\", \"dns\": \"address\"}]"}
]
const results = inputs.map(stripEmptySettings);
console.log(JSON.stringify(results, null, 3));

<!-- end snippet -->

JS has a builtin filter function. For the settings value using JSON.stringify() and JSON.parse() will be the easiest way to serialize the array

const filteredList = fieldNames.filter(field => {
if("settings" in field){
let settings = JSON.parse(field.settings)
if(
settings.length > 0 &&
settings[0]
){
let nonEmpty = false
const keys = Object.keys(settings[0])
for(let i =0; i < keys.length; i ++){
if(settings[0][keys[i]]){
nonEmpty = true
break
}
}
return nonEmpty
}
return false
}
return true
})