add go fiber example

go-fiber-simple/cmd/api/helpers.go

@@ -0,0 +1,28 @@
+package main
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+// The writeJSON() method is a generic helper for writing JSON to a response
+func (app *application) writeJSON(w http.ResponseWriter, sCode int, data any, headers http.Header) error {
+	marshalledJson, err := json.Marshal(data)
+
+	if err != nil {
+		return err
+	}
+
+	// Valid json requires newline
+	marshalledJson = append(marshalledJson, '\n')
+
+	for key, value := range headers {
+		w.Header()[key] = value
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(sCode)
+	w.Write(marshalledJson)
+
+	return nil
+}