[Go convert JSON types when unmarshalling] #go #golang #json #unmarshal

main.go

package main

import (
	"encoding/json"
	"fmt"
)

func main() {
	var jsonBlob = []byte(`[
	{"str": "Foo", "num": "1", "bool": "true", "its": 3},
	{"str": "Bar",    "num": "2", "bool": "false", "its": 4}
]`)
	type Thing struct {
		String  string `json:"str"`
		Number  int    `json:"num,string"`
		Boolean bool   `json:"bool,string"`
		// IntToString string `json:"its,int"` // error: json: cannot unmarshal number into Go struct field Thing.its of type string 
	}
	var things []Thing
	err := json.Unmarshal(jsonBlob, &things)
	if err != nil {
		fmt.Println("error:", err)
	}
	fmt.Printf("%#v", things)
}