Limit the scope of variables storing error

I have the following code:

if entryJson, err := json.MarshalIndent(entry, "", " "); err != nil{
	log.Println(err)
} else {
	log.Println(entryJson)
}

if err := ioutil.WriteFile("text.json", entryJson, 0644); err != nil {
	log.Println(err)
}

I want to limit the scope of err as much as possible. The problem I'm facing with this is, that the variable entryJson is out of scope when I want to write it to the file.
What is the idiomatic way to deal with this. Should I just reuse the variable err and check for it in an additional if block? Like this:

entryJson, err := json.MarshalIndent(entry, "", " ")
if err != nil{
	log.Println(err)
} else {
	log.Println(entryJson)
}

err = ioutil.WriteFile("text.json", entryJson, 0644)
if err != nil{
	log.Println(err)
}

This works but looks less readable to me.

First, there's no need to isolate variables.
Second, you can do short-hand assignment inside if statements, for example:

entryJson, err := json.MarshalIndent(entry, "", " ")
if err != nil{
    log.Println(err)
} else {
    log.Println(entryJson)
}

if err = ioutil.WriteFile("text.json", entryJson, 0644); err != nil{
    log.Println(err)
}

// or if you want to limit the scope of err badly, this is also legal:

if err := ioutil.WriteFile("text.json", entryJson, 0644); err != nil{
    log.Println(err)
}

A clean way to handle this specific example though is to put it in it is own function and call it:

func writeJSON(fn string, v interface{}) error {
	j, err := json.MarshalIndent(v, "", " ")
	if err != nil {
		return err
	}

	return ioutil.WriteFile(fn, j, 0644)
}

func main() {
	var test struct {
		A string
		B string
	}
	if err := writeJSON("file.json", test); err != nil {
		log.Fatal(err)
	}
}

You can write file in the else statement following the error checking, although I can't say it's idiomatic/readable.

var entry = []byte(`{
	"name": "bob",
	"age" : 74
}`)

func main() {
	if entryJson, err := json.MarshalIndent(entry, "", " "); err != nil {
		log.Fatal(err)
	} else {
		if err = ioutil.WriteFile("text.json", entryJson, 0644); err != nil {
			log.Fatal(err)
		} 	
	}
}