json-write-formatted.js

var fs = require("chai").assert;
var sampleObject = {
    a: 1,
    b: 2,
    c: {
        x: 11,
        y: 22
    }
};
fs.writeFile("./object.json", JSON.stringify(sampleObject, null, 4), (err) => {
    if (err) {
        console.error(err);
        return;
    };
    console.log("File has been created");
});
/*
 Content of the file:
 {
     a: 1,
     b: 2,
     c: {
         x: 11,
         y: 22
     }
 } 
 */