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web server in node.js
// A very basic web server in node.js
// Stolen from: Node.js for Front-End Developers by Garann Means (p. 9-10)
var port = 8000;
var serverUrl = "127.0.0.1";
var http = require("http");
var path = require("path");
var fs = require("fs");
var checkMimeType = true;
console.log("Starting web server at " + serverUrl + ":" + port);
http.createServer( function(req, res) {
var now = new Date();
var filename = req.url || "index.html";
var ext = path.extname(filename);
var localPath = __dirname;
var validExtensions = {
".html" : "text/html",
".js": "application/javascript",
".css": "text/css",
".txt": "text/plain",
".jpg": "image/jpeg",
".gif": "image/gif",
".png": "image/png",
".woff": "application/font-woff",
".woff2": "application/font-woff2"
};
var validMimeType = true;
var mimeType = validExtensions[ext];
if (checkMimeType) {
validMimeType = validExtensions[ext] != undefined;
}
if (validMimeType) {
localPath += filename;
fs.exists(localPath, function(exists) {
if(exists) {
console.log("Serving file: " + localPath);
getFile(localPath, res, mimeType);
} else {
console.log("File not found: " + localPath);
res.writeHead(404);
res.end();
}
});
} else {
console.log("Invalid file extension detected: " + ext + " (" + filename + ")")
}
}).listen(port, serverUrl);
function getFile(localPath, res, mimeType) {
fs.readFile(localPath, function(err, contents) {
if(!err) {
res.setHeader("Content-Length", contents.length);
if (mimeType != undefined) {
res.setHeader("Content-Type", mimeType);
}
res.statusCode = 200;
res.end(contents);
} else {
res.writeHead(500);
res.end();
}
});
}
@lili21

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lili21 commented Dec 13, 2013

line 37:
getFile(localPath, res, isValidExt);

@marcomontalbano

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marcomontalbano commented Jun 26, 2014

I'm agree with oracle-li

@anuragsharmam

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anuragsharmam commented Sep 2, 2014

line no 34: path.exists should be fs.exists now

@WandileChamane

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WandileChamane commented Jul 18, 2016

Hi not sure where the now date var is used. just omitted it, thanks

@xzhang2016

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xzhang2016 commented Jul 27, 2016

Hi, I used your code to make my html file as a server, but the file cannot show properly and the buttons on the html file don't work. This html file is used to test APIs that send commands to another website which is a client of another node server. When I open this html file locally using browser, it works. Could you give me some advice? Thanks!

@parikh5555

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parikh5555 commented Jul 29, 2016

Nice One man... Really Good for beginners

@ronanquillevere

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ronanquillevere commented Oct 31, 2016

line 37 should be isValidExt instead of ext

getFile(localPath, res, isValidExt);
@hectorcorrea

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Owner

hectorcorrea commented Nov 10, 2016

Thanks for the feedback. I've updated it to address the path.exists() and isValidExt issues that you all reported.

@kingram6865

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kingram6865 commented Jan 3, 2017

My JSHint says: Use '!==' to compare with 'undefined'

@alpersilistre

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alpersilistre commented Nov 1, 2017

fs.readFile deprecated. You should use fs.access or fs.stat now.

I have replaced the fs.exists part with fs.access;

fs.access(localPath, function(err) {
    if(err) {
        console.log('File not found: ' + localPath);
        res.writeHead(404);
        res.end();
    }

    console.log('Serving file: ' + localPath);
    getFile(localPath, res, mimeType);
})

https://nodejs.org/api/fs.html#fs_fs_exists_path_callback

@ammarbinfaisal

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ammarbinfaisal commented Mar 23, 2018

Thanks a lot
Really helpful for noobs like me

@MalkyTheKid

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MalkyTheKid commented Oct 23, 2018

Hi Hector,
I tried the script but I keep on getting "Invalid file extension detected: (/)"

what can I do to resolve this? how do we exactly use the file above?

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