I am trying to serve static content for the app from the "www" directory in the application directory.

my folders look like this:

    -www
    --node_modules
    --js
    --index.js
    --index.html
    --package.json

I want to use the main.js file that is inside the js folder but when I try to use the

    <script src="/js/main.js"></script> 

in the index.html, my console give me a GET error and 404 file not found.

My code looks something like this:

    var app = require('express')();
    var http = require('http').Server(app);
    var io = require('socket.io')(http);

    app.use(express.static(__dirname + '/www'));

    app.get('/', function(req, res){
    res.sendFile(__dirname + '/index.html');
    });

when I try to run the server I get the error:

    app.use(express.static(__dirname + '/www');
    ReferenceError: express is not defined

Can someone give me a hint of why this is happening?

I am trying to serve static content for the app from the "www" directory in the application directory.

my folders look like this:

    -www
    --node_modules
    --js
    --index.js
    --index.html
    --package.json

I want to use the main.js file that is inside the js folder but when I try to use the

    <script src="/js/main.js"></script> 

in the index.html, my console give me a GET error and 404 file not found.

My code looks something like this:

    var app = require('express')();
    var http = require('http').Server(app);
    var io = require('socket.io')(http);

    app.use(express.static(__dirname + '/www'));

    app.get('/', function(req, res){
    res.sendFile(__dirname + '/index.html');
    });

when I try to run the server I get the error:

    app.use(express.static(__dirname + '/www');
    ReferenceError: express is not defined

Can someone give me a hint of why this is happening?

• javascript
• node.js
• express

4 Answers 4

You forgot to import express.

You also should move your non static files outside "www" since that's the path you want for the "static files".

 var express = require('express');
 var path = require('path');
 var app = express();
 var http = require('http').Server(app);
 var io = require('socket.io')(http);

 var publicPath = path.resolve(__dirname, 'www');


 app.use(express.static(publicPath));
 app.get('/', function(req, res){
     res.sendFile('index.html', {root: publicPath});
 });

In your code, you haven't declared any variable named as express. Without variable named as express how you can call it's variables/functions/keys.

To use express./anything/ you have to declare express variable in your code. that can be done via

var express = require('express');

With Webstorm, it didn't work if I used :

const express = require('express');

But work with : var express = require('express');

Maybe it's related to Webstorm, maybe it's not a "good" answer, but for me it solves this issue.

If your answer says express is not defined, then in your cmd or bash terminal, use the following command:-

$ npm install express

After the install successfully completes, require the express module using the following:-

const express=require('express');

run your code. Remember to try it first in a localhost server. Add a port listener to ur code and try it out.