JSFiddle - React, Tailwind, and code Playground

JavaScript

var options = {
    lang: "np"
};
var lang = {
    "en": {
        "var1" : "This is variable one"
    },
    "np": {
        "var1": "यो एउटा भेरियबल हो ।"
    }
};

function showVar1() {
    alert(lang[options.lang].var1);
}

showVar1();