Using kneesocks as bash command

.bash_profile

alias npm-proxy='launchctl start com.dev.proxy'
alias npm-direct='launchctl stop com.dev.proxy; npm config delete proxy; npm config delete https-proxy'

README.md

• npm install kneesocks -g
• Make sure you edit the port number in com.dev.proxy.plist
• Put com.dev.proxy.plist at ~/Library/LaunchAgents
• Run sudo launchctl unload -w ~/Library/LaunchAgents/com.dev.proxy.plist to enable this service
• Edit ~/.bash_profile and add those 2 lines
• Use npm-proxy and npm-direct to toggle proxy for npm

com.dev.proxy.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>Label</key>
	<string>com.dev.proxy</string>
	<key>ProgramArguments</key>
	<array>
		<string>sh</string>
		<string>-c</string>
		<string>npm config set proxy http://127.0.0.1:10002; npm config set https-proxy http://127.0.0.1:10002; kneesocks 10002 10001</string>
	</array>
</dict>
</plist>

For reference: https://github.com/bitinn/kneesocks