Get json value based on dynamic key mapping for partial path - node.js

Question

I am trying to get the values of a key in a json file, but there are several issues that I need to solve.
The key of the JSON is dynamic - I have another JSON in which I am given the path of the key inside the JSON.
For example, I have a json file that contains the following mapping:
{
"addressesPath":"personal.addresses"
}
This tells me that the value I am looking for is inside another key, called personal.
The JSON will look like this:
{
"username": "X1",
"id":"1X",
"type": "patron",
"group": "students",
"personal": {
"lastname": "lname",
"firstname": "fname",
"email": "test#test.test",
"phone": "1-111-111-1111",
"mobilePhone": "[phone]",
"birthDate": "1979-01-23T00:00:00.000+0000",
"addresses":
{
"countryId": "US",
"addressLine1": "1111 Brannon Ford Suite 111",
"city": "Kettering",
"region": "MA",
"postalCode": "11111-1111",
"primaryAddress": true
}
}
}
So for example if the JSON is "user", what I want to get is user.personal.addresses
How can I translate "user.personal.addresses" to "users.+dynamic"?
I tried doing it just like that, but it doesn't seem to work with any type of string I extract from the mapping json file.
I have an issue because I don't know if the location I am getting is a single value or an array of values.
For example, the JSON could look like this:
{
"username": "X1",
"id":"1X",
"type": "patron",
"group": "students",
"personal": {
"lastname": "lname",
"firstname": "fname",
"email": "test#test.test",
"phone": "1-111-111-1111",
"mobilePhone": "[phone]",
"birthDate": "1979-01-23T00:00:00.000+0000",
"addresses":[
{
"countryId": "US",
"addressLine1": "1111 Brannon Ford Suite 111",
"city": "Kettering",
"region": "MA",
"postalCode": "11111-1111",
"primaryAddress": true
}, {
"countryId": "US",
"addressLine1": "1112 Brannon Ford Suite 112",
"city": "Kettering",
"region": "IL",
"postalCode": "11112-1112",
"primaryAddress": false
}
]
}
}
Which means I need to determine the structure of the data I am going to get, whether it is an array or not.
Can I do this by checking if the result is a string or object? I know that arrays from JSON files are read as objects in node js.

Answer 1

You want something like that
With three examples
let object = {
"group": "students",
"personal": {
"addresses": {
"countryId": "US",
}
}
}
let test1 = checkObject(object, "personal.addresses")
console.log(test1);
let object2 = {
"test": {
"test_deep": [
{
"countryId": "US",
"addressLine1": "1111 Brannon Ford Suite 111"
},
{
"countryId": "US",
"addressLine1": "1112 Brannon Ford Suite 112",
}
]
}
}
let test2 = checkObject(object2, "test.test_deep")
console.log(test2);
let object3 = {
"test": {
"test_deep": "test"
}
}
let test3 = checkObject(object3, "test.test_deep")
console.log(test3);
function checkObject(object, addressesPath) {
let addres = addressesPath.split(".")
let item = object
for (let index = 0; index < addres.length; index++) {
if (typeof item[addres[index]] != 'undefined') {
item = item[addres[index]]
} else {
item = null
break
}
}
return {
type: typeof item,
is_array: Array.isArray(item),
data: item
}
}