Generic JSON Unmarshaling in Go

main.go

package main

import (
	"encoding/json"
	"log"
)

type Response[T any] struct {
	Status string `json:"status"`
	Data   T      `json:"data"`
}

type NetInfo struct {
	CurrentBlock uint   `json:"current_block"`
	HighestBlock uint   `json:"highest_block"`
	NetworkID    string `json:"network_id"`
}

func main() {
	var res Response[NetInfo]
	if err := json.Unmarshal([]byte(data), &res); err != nil {
		log.Fatalln("failed to unmarshal response:", err)
	}

	log.Println(res.Data.CurrentBlock)
}

const data = `
{
  "status": "success",
  "data": {
    "listening": true,
    "syncing": false,
    "mining": false,
    "peer_count": 8,
    "current_block": 40035,
    "highest_block": 40035,
    "network_id": "mainnet"
  }
}
`