Variable JSON values / methods inside JSON

Question

My website has a functionality of synthesizing speech from preset text. I wanted to diversify it to include multiple languages. Hence, I chose to move the texts to JSON voiceOutputs.

{
    "english": {
        "actionStarted": "Action has started",
        "success": "Success",
        "error": "Error occured",
        "goodNight": "Good Night"
    },
    "japanese": {
        "actionStarted": "アクションが始まりました",
        "success": "成功しました",
        "error": "エラーが発生しました",
        "goodNight": "おやすみなさい"
    }
}

And I can use these texts by

voiceOutputs.[getCookie("voiceLang")].actionStarted;

How do I revamp my variable dependent texts into JSON structure as the sentence pattern differs with languages.

Eg.

"Good bye " + variableforName
variableForName + "おやすみなさい。"

I can't call "goodBye" and "おやすみなさい" directly as I want to create a generalized version of output and I need a proper word pattern depending on language.

Work-arounds: 1. Using a function (easy but not optimized and takes a lot of work)

function goodNight(variableForName) {
    if (getCookie("voiceLang") == "japanese") {
        return variableForName+voiceOutputs.[getCookie("voiceLang")].goodNight;
    }
    else if (getCookie("voiceLang") == "english") {
            return voiceOutputs.[getCookie("voiceLang")].goodNight + " " + variableForName;
    }

2. Methods inside voiceOutputs JSON:

Is it possible???

Answer 1

You can use a library for string formats (I do not know of any solid ones, please edit my answer or post your own), but you could also just use Vanilla Javascript's String.prototype.replace Combined with a character pattern you expect not to be seen in the same string otherwise

Eg

"Good bye {{%name}}";
"{{%name}}おやすみなさい。";

You can then use both the same way, by calling .replace('{{%name}}', nameVariable)