Missing Callback function

Question

function onRequest(req, res) {
    if (req.body.widget_name) {
        console.log(req.body.widget_name);
    }
    var fs = require('fs');
    var data = fs.readdir("corpdashboard/dashboards", 'UTF-8', function (err, files) {
        if (err) {
            return console.log(err);
        }
        console.log(data);
    });
    var body = req.body.dashboard_selected + ' ' + req.body.widget_selected + ' ';
    res.setHeader('Content-Type', 'text/plain');
    res.setHeader('Content-Length', body.length);
    res.end(body);
}
exports.onrequest = onRequest;

I want to read directories and the file in that so I write this code and run it. on running i am getting that fs:missing callback function :ENOENT readdir 'D:\dev\corpdashboboard\dashboard.js' 'D:\dev\corpdashboboard' is the where i have my ejs file and js file what does it means? what should I do to read directories and files in them

If you expect other people to read your code, please indent it properly. — Felix Kling
– Felix Kling, Commented Nov 28, 2013 at 8:50

Are · Accepted Answer · 2013-11-28 08:27:28Z

1

From official spec: http://nodejs.org/api/fs.html#fs_fs_readdir_path_callback

fs.readdir(path, callback)
Asynchronous readdir(3). Reads the contents of a directory.
The callback gets two arguments (err, files) where files is
an array of the names of the files in the directory excluding '.' and '..'.

You are using wrong arguments. fs.readdir() does not take encoding. So readdir expects path which is a string and callback which is a function.

It should be:

var data = fs.readdir('corpdashboard/dashboards',function (err, files) {
    if (err) {
         return console.log(err);
    }
    console.log(data);
});

answered Nov 28, 2013 at 8:27

Are

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Comments

Brandon · Accepted Answer · 2016-04-30 20:23:15Z

0

A note to anyone reading this: The answers above were valid, but in Node v6.x, fs.readdir does accept an additional argument, which you can see in the documentation. https://nodejs.org/api/fs.html#fs_fs_readdir_path_options_callback

If you're encountering this issue, check to make sure that you're running Node v6.0.0 or later.

answered Apr 30, 2016 at 20:23

Brandon

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2 Comments

Ravid Goldenberg Over a year ago

This should be a comment on the subject answer.

Brandon Over a year ago

^ I've not enough rep.

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