I wanted to use socket.io and after installing with npm install socketio —save, when I tried require(‘socket.io’), I got Error: Cannot find module ‘socket.io’ and spent tens of minutes wondering “Why…?”

$ node index.js

module.js:327
    throw err;
    ^

Error: Cannot find module 'socket.io'
    at Function.Module._resolveFilename (module.js:325:15)
    at Function.Module._load (module.js:276:25)
    at Module.require (module.js:353:17)
    at require (internal/module.js:12:17)
    at Object. (/Users/username/works/sample/index.js:9:16)
    at Module._compile (module.js:409:26)
    at Object.Module._extensions..js (module.js:416:10)
    at Module.load (module.js:343:32)
    at Function.Module._load (module.js:300:12)
    at Function.Module.runMain (module.js:441:10)

As it turned out, socketio was not the module I should use, and the correct one is socket.io. After fixing package.json as shown below and running npm install again, I was able to require(‘socket.io’) successfully.

diff --git a/package.json b/package.json
index 30cdfac..84192a7 100644
--- a/package.json
+++ b/package.json
@@ -16,6 +16,6 @@
-    "socketio": "^1.0.0"
+    "socket.io": "^1.5.1"
   }
 }

I’d prefer if they didn’t use the confusing package name socketio.

That’s all from the Gemba.