ENOENT: no such file or directory, mkdir nodejs code example
Example: ENOENT, no such file or directory
Have you created a package.json file? Maybe run this command first again.
C:\Users\Nuwanst\Documents\NodeJS\3.chat>npm init
It creates a package.json file in your folder.
Then run,
C:\Users\Nuwanst\Documents\NodeJS\3.chat>npm install socket.io --save
The --save ensures your module is saved as a dependency in your package.json file.