package main

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"os"
)

// Pretty validates JSON and formats it with two-space indentation.
func Pretty(src []byte) ([]byte, error) {
	var dst bytes.Buffer
	if err := json.Indent(&dst, bytes.TrimSpace(src), "", "  "); err != nil {
		return nil, err
	}
	dst.WriteByte('\n')
	return dst.Bytes(), nil
}

func main() {
	src, err := io.ReadAll(os.Stdin)
	if err != nil {
		fmt.Fprintln(os.Stderr, "read:", err)
		os.Exit(1)
	}

	out, err := Pretty(src)
	if err != nil {
		fmt.Fprintln(os.Stderr, "invalid JSON:", err)
		os.Exit(1)
	}

	if _, err := os.Stdout.Write(out); err != nil {
		fmt.Fprintln(os.Stderr, "write:", err)
		os.Exit(1)
	}
}