How can I use custom structs in Go to handle JSON data?

How can I use custom structs in Go to handle JSON data?

You can define custom structs in Go that match the JSON structure. Use the json package to marshal and unmarshal data.

Can you show me an example of a custom struct for a JSON object?

Sure! Here's a simple example:

type Person struct {
    Name string `json:"name"`
    Age  int    `json:"age"`
}

This struct can be used to unmarshal JSON objects with 'name' and 'age' fields.

How do I unmarshal JSON data into this struct?

You can use the json.Unmarshal function. Here's how:

var p Person
data := []byte(`{"name":"John", "age":30}`)
err := json.Unmarshal(data, &p)
if err != nil {
    log.Fatal(err)
}

This will populate the p variable with the JSON data.

What if the JSON fields don't match the struct names?

You can use struct tags to specify the JSON field names. For example:

type Person struct {
    Name string `json:"full_name"`
    Age  int    `json:"years"`
}

This will map 'full_name' to Name and 'years' to Age.