Create Directory When Writing To File In Node.js

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I’ve been tinkering with Node.js and found a little problem. I’ve got a script which resides in a directory called data. I want the script to write some data to a file in a subdirectory within the data subdirectory. However I am getting the following error:

{ [Error: ENOENT, open 'D:\data\tmp\test.txt'] errno: 34, code: 'ENOENT', path: 'D:\\data\\tmp\\test.txt' }

The code is as follows:

var fs = require('fs');
fs.writeFile("tmp/test.txt", "Hey there!", function(err) {
    if(err) {
        console.log(err);
    } else {
        console.log("The file was saved!");
    }
});

Can anybody help me in finding out how to make Node.js create the directory structure if it does not exits for writing to a file?

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