nodejs – The Admin

NodeJS is an awesome platform to build applications in javascript which can run on the server.
It allows you to read n write to files asynchronously and synchronously

Writing Data to files

The easiest way would be write synchronously (i.e. wait till the writing operating is finished)

var fs = require('fs');
fs.writeFileSync('/path/to/some_text.txt', 'some text');

But the preferable way of writing to files will be asynchronous in context of web apps.

var fs = require('fs');
fs.writeFile("/path/to/some_text.txt", "test data!", function(err) {
    if(err) {
        console.log(err);
    } else {
        console.log("file has been saved successfully");
    }
});

In this case the program will continue to execute next instruction without waiting for the file write to complete. Once the file writing is completed, the third parameter (closure ) is executed. Above method overwrite the current file. So if you want to append the data, use