Diff JSON files

jsondiff.go

package main

import (
        "encoding/json"
        "fmt"
        "log"
        "os"

        "github.com/google/go-cmp/cmp"
)

func main() {
        nameA, nameB := os.Args[1], os.Args[2]
        a, b := map[string]interface{}{}, map[string]interface{}{}
        bytesA, err := os.ReadFile(nameA)
        if err != nil {
                log.Fatalf("read %s: %v", nameA, err)
        }

        bytesB, err := os.ReadFile(nameB)
        if err != nil {
                log.Fatalf("read %s: %v", nameB, err)
        }

        if err := json.Unmarshal(bytesA, &a); err != nil {
                log.Fatalf("unmarshal %s: %v", nameA, err)
        }
        if err := json.Unmarshal(bytesB, &b); err != nil {
                log.Fatalf("unmarshal %s: %v", nameB, err)
        }

        diff := cmp.Diff(a, b)
        fmt.Println(diff)
}