Parse json array into list of struct golang

I have a json like below and I am trying to make a struct for below json which can store the data for me when I unmarshall it.

{
"clientMetrics": [
{
"clientId": 951231,
"customerData": {
"Process": [
"ABC"
],
"Mat": [
"KKK"
]
},
"legCustomer": [
8773
]
},
{
"clientId": 1234,
"legCustomer": [
8789
]
},
{
"clientId": 3435,
"otherIds": [
4,
32,
19
],
"legCustomer": [
10005
]
},
{
"clientId": 9981,
"catId": 8,
"legCustomer": [
13769
]
},
{
"clientId": 12124,
"otherIds": [
33,
29
],
"legCustomer": [
12815
]
},
{
"clientId": 8712,
"customerData": {
"Process": [
"College"
]
},
"legCustomer": [
951
]
},
{
"clientId": 23214,
"legCustomer": [
12724,
12727
]
},
{
"clientId": 119812,
"catId": 8,
"legCustomer": [
14519
]
},
{
"clientId": 22315,
"otherIds": [
32
],
"legCustomer": [
12725,
13993
]
},
{
"clientId": 765121,
"catId": 8,
"legCustomer": [
14523
]
}
]
}

clientMetrics is a json array which contains each clientMetric object. Each clientMetric object can have various fields into it. I tried something like below but I am confuse on how to add rest since I am coming from Java background and I don't see there is set available in golang. Also confuse on how to add customerData object too.

type ClientMetrics struct {
ClientId    int64
CatId       int64
}

What is the best way to unmarshall above json into a list of ClientMetrics struct in golang?

You can use json to go here : https://mholt.github.io/json-to-go/

But it will repeat CustomerData struct twice make sure you should remove one of them.

I have created a sample struct for your scenario as follows :

type AutoGenerated struct {
ClientMetrics []struct {
ClientID     int `json:"clientId"`
CustomerData struct {
Process []string `json:"Process"`
Mat     []string `json:"Mat"`
} `json:"customerData,omitempty"`
LegCustomer []int `json:"legCustomer"`
OtherIds    []int `json:"otherIds,omitempty"`
CatID       int   `json:"catId,omitempty"`
} `json:"clientMetrics"`
}

You can run it here in go playground : https://go.dev/play/p/R1M1HfzpEny

If you're using VS Code, there are a few extensions that can do this job.
One of them is named Paste JSON as Code.

1. Install the extension
2. Copy the JSON and in your clipboard (ctrl+c)
3. Press Ctrl+Shift+P and select Paste JSON as code
4. Type name of struct and press enter

If this doesn't work for you, you can always use this site https://mholt.github.io/json-to-go/ but it would be a better practice to use the struct obtained after unselecting Inline type definitions option.