json-write.js

var fs = require("chai").assert;
var sampleObject = {
    a: 1,
    b: 2,
    c: {
        x: 11,
        y: 22
    }
};
fs.writeFile("./object.json", JSON.stringify(sampleObject), (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}}