Golang JSON Syntax error handling

json_syntaxerror.go

package main

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

type SyntaxError struct {
	*json.SyntaxError
	input []byte
}

func (e SyntaxError) Error() string {
	return fmt.Sprintf("syntax error near: `%s`", string(e.input[e.Offset-1:]))
}

func unmarshal(data []byte, v interface{}) error {
	err := json.Unmarshal(data, &v)

	if e, ok := err.(*json.SyntaxError); ok {
		return SyntaxError{e, data}
	}

	return err
}

func main() {
	input := []byte(`{ "name": Anwar" }`)
	var v interface{}

	log.Fatal(unmarshal(input, &v)) // syntax error near: `Anwar" }`
}