Writer-Example-Response-Writer.go

http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
    jsonData, err = json.Marshal(data)
    if err != nil {
        // Handle Error
    }
    _, err = w.Write(jsonData)
    if err != nil {
        // Handle Error
    }
})
err = http.ListenAndServe(":8080", nil)
if err != nil {
    // Handle Error
}