Error: Cannot find module 'socket.io'

问题:

[~]# node node.js

Error: Cannot find module 'socket.io'

[~]# node -v
v0.10.10

socket.io installed:

npm install socket.io

npm WARN package.json policyfile@0.0.4 No repository field.
npm WARN package.json policyfile@0.0.4 'repositories' (plural) Not supported.
npm WARN package.json Please pick one as the 'repository' field

回答1:

Looks like you have installed socket.io in a different location to your current path. Either install globally like below:

npm install -g socket.io

Or reference the location you've installed to:

var io = require('../lib/socket.io');

回答2:

Thanks ajtrichards!

Just to add to the answer - in case you simple use

sudo npm install socket.io

The installation path will be

/home/.../.npm/socket.io

If you use sudo npm install -g socket.io

The installation path will be

/usr/local/lib/node_modules/socket.io

In first case, I tried adding the socket.io path in global path variable but it did not work.

回答3:

I had the same issue with version 0.12.0 on Windows. I tried npm install -g socket.io but that didn't change anything. Also tried npm cache clean also no change, but after npm update npm -g, things got well.

回答4:

This almost happens than you try to get socket.io in you html files like :

index.html

where you have:

 < script type="text/javascript" src="/socket.io/socket.io.js"></script>

It will not find socket.io because you did not started module in you application file wich contain the server like

server.js

You must include following lines after started your server in server.js :

var io = require('socket.io').listen(server);

Hope, will save time.

回答5:

I think that you have executed the command npm install socket.io in a different location and your files are in different directory.. So either run the command in the same directory which have your files or either mention the path where you have currently installed socket.io in your PATH variable.