node.js script -- websocket error

Question

I have installed node.js on my windows-7 PC. I am not able to create websocket connection to a remote server.

I tried to load modeule "ws" in my script :--

var WebSocket = require('ws')

It gave an error :--

cannot find module 'ws'

So i followed instructions over here :--
node.js websocket module installed but won't work in scripts

Execute cmd as Administrator (Right click cmd icon-> Run as Administrator) Then type in cmd:

c:\Node Instalation Dir\> npm install -g express
c:\Node Instalation Dir\> npm install websocket --force

Then run my script :--
D:\My Script Folder \> node myscript.js

Again same error. What could be the problem ?

cannot find module 'ws'

Answer 1

If you install websocket, you should require websocket, not ws:

npm install websocket

Then in REPL:

var websocket = require('websocket');

Alternatively, you can use ws module:

npm install ws

Repl/script:

var ws = require('ws');

---

Take a look at your node_modules directory (only the first level, the dirs right beneath it). You can require each of them by exact name.

require will actually look for a node_modules in current dir, then if not found, then the parent and again parent etc. If it doesn't find it, it will look for modules installed in global path pointed to by NODE_PATH. (And of course, native modules such as http and net.)

Answer 2

Try to install the package locally but not globally, i.e. without the -g option.

Have you installed the module with the -g option? I think that not every module is meant to be installed globally, instead, try installing it locally for the project you are creating (npm install), and check if the error persists. [...]

If you want to just require('something'); it is better to install it locally, otherwise, you have to require('{PREFIX}something'), where prefix is the path to where yo have installed it globally. Check out this blog post , and, as it says, generally the rule of thumb is to install things locally if you are going to use them in your app, and globally if you are going to use them from the command line.

node error cannot find module already installed.