Encode & decode a JSON string as a number in Go

number_as_string.go

package main

import (
	"encoding/json"
	"fmt"
)

type Product struct {
	Name  string
	Price float64 `json:",string"`
}

func main() {
	s := `{"name":"Galaxy Nexus", "price":"3460.00"}`
	var pro Product
	err := json.Unmarshal([]byte(s), &pro)
	if err == nil {
		fmt.Printf("%+v\n", pro)
		// https://play.golang.org/p/GDrP18janS
		// http://stackoverflow.com/questions/9452897/how-to-decode-json-with-type-convert-from-string-to-float64-in-golang
		proJson, _ := json.Marshal(pro)
		fmt.Printf(string(proJson))
	} else {
		fmt.Println(err)
		fmt.Printf("%+v\n", pro)
	}
}