Stop json.Marshal() from stripping trailing zero from floating point number

Question

I got the following problem: My golang program converts some information into JSON. For example it results in the following json:

{
   \"value\":40,
   \"uni         


        

Answer 1

  type MyFloat float64
  func (mf MyFloat) MarshalJSON() ([]byte, error) {                                                          
      return []byte(fmt.Sprintf("%.1f", float64(mf))), nil                                                     
  }

used like this

 type PricePoint struct {
     Price    MyFloat   `json:"price"`
     From     time.Time `json:"valid_from"`
     To       time.Time `json:"valid_to"`
 }

Replace the 1 in "%.1f" with what ever precision you need