How to Extract an IP Address from a JSON HTTP Response in Golang?

Parse JSON HTTP Response Using Golang

Parsing JSON HTTP responses in Go allows developers to extract and process data efficiently. This question addresses a scenario where a user seeks to extract the IP address from a JSON response.

The provided Go code attempts to parse the JSON using the json.Unmarshal function. However, it assigns the decoded data to a struct svc that does not accurately reflect the JSON structure.

To correctly parse the JSON, you should define structs that mirror the JSON structure, as demonstrated in the following code:

type Example struct {
    Type    string   `json:"type,omitempty"`
    Subsets []Subset `json:"subsets,omitempty"`
}

type Subset struct {
    Addresses []Address `json:"addresses,omitempty"`
}

type Address struct {
    IP string `json:"IP,omitempty"`
}

Once you have defined the structs, you can use json.NewDecoder to decode the JSON response into an instance of the Example struct:

r := bytes.NewReader(m)
decoder := json.NewDecoder(r)

val := &Example{}
err := decoder.Decode(val)

Using this approach, you can access the IP address by looping through the Subsets and Addresses slices within the parsed Example struct:

for _, s := range val.Subsets {
    for _, a := range s.Addresses {
        fmt.Println(a.IP)
    }
}

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