NodeJS read/write text files

"use strict";

(function() {
    var fs = require("fs");
    var readline = require("readline");
    
    fs.readFile("input.json", function(error, data) {
        var obj = JSON.parse(data);
        fs.writeFile("output.json", JSON.stringify(obj), function(err) {
            if (err) {
                console.log("Error: " + err);
            } else {
                console.log("Saved");
            }
        });
    });
    
    (function() {
        var outputStream = fs.createWriteStream("output.txt");
        
        var lineReader = readline.createInterface({
            input: fs.createReadStream("input.txt")        
        });
        lineReader.on("line", function(line) {
            console.log("Line: " + line);
            outputStream.write(line + "\r\n");
        });
        lineReader.on("close", function() {
            outputStream.end();
        });
    })();
})();