json by float

scratch.go

package main

import (
	"encoding/json"
)

type Test struct {
	Id    string `json:"id"`
	Specs []Spec `json:"spec"`
}
type Spec struct {
	Vid uint `json:"vid"`
	X float32 `json:"x"`
	Y float64 `json:"y"`
	Z float64 `json:"z"`
}

func main() {
	spec := Spec{Vid:1,X:1.2345, Y:9.876, Z:-1.2345}
	test := Test{Id:"1",Specs:[]Spec{spec}}

	json, err := json.Marshal(test)
	if err != nil{
		println("Marshal err",err)
		return
	}
	println(string(json))
}