gistfile1.txt

package main

import (
	"bytes"
	"encoding/json"
	"fmt"
)


type Test struct {
	SlowRampTime           *int    `json:"slowRampTime,omitempty"`
}


func jsonMarshal(t interface{}) ([]byte, error) {
	buffer := &bytes.Buffer{}
	encoder := json.NewEncoder(buffer)
	encoder.SetEscapeHTML(false)
	err := encoder.Encode(t)
	return buffer.Bytes(), err
}

func intToPointer(integer int) *int {
	var i int
	i = integer
	return &i
}
func main() {
	test := Test{
		SlowRampTime: intToPointer(0),
	}
	marshalJSON, err := jsonMarshal(test)
	if err != nil {
		fmt.Errorf(err.Error())
	}
	fmt.Printf("json: %s", string(marshalJSON))

	test2 := Test{
		SlowRampTime: intToPointer(1),
	}
	marshalJSON2, err := jsonMarshal(test2)
	if err != nil {
		fmt.Errorf(err.Error())
	}
	fmt.Printf("json: %s", string(marshalJSON2))

	test3 := Test{
	}
	marshalJSON3, err := jsonMarshal(test3)
	if err != nil {
		fmt.Errorf(err.Error())
	}
	fmt.Printf("json: %s", string(marshalJSON3))

}


% go run main.go
json: {"slowRampTime":0}
json: {"slowRampTime":1}
json: {}