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Whenever I try to use require("socket.io"); on heroku it fails with the message “Cannot find module socket.io”.
I think it’s an issue with my setup, because the same is running fine in my local node.js server.
What do I have to change?
You have to change your PaaS provider. Heroku doesn’t support websockets. Where as nodejitsu is known for support websockets.
Also, you might have forgot adding
socket.ioin package.json dependency lists.