Simple StartCalendarInterval launchd test with node.

com.example.test.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Label</key>
    <string>com.example.test</string>
    <key>ProgramArguments</key>
    <array>
        <string>/usr/local/bin/node</string>
        <string>/test.js</string>
    </array>
    <key>StartCalendarInterval</key>
	<array>
	    <dict>
	        <key>Minute</key>
	        <integer>4</integer>
	    </dict>
	    <dict>
	        <key>Minute</key>
	        <integer>5</integer>
	    </dict>
	    <dict>
	        <key>Minute</key>
	        <integer>6</integer>
	    </dict>
	    <dict>
	        <key>Minute</key>
	        <integer>7</integer>
	    </dict>
	    <dict>
	        <key>Minute</key>
	        <integer>8</integer>
	    </dict>
	</array>
</dict>
</plist>

test.js

fs = require('fs');

// for verifying respawns
fs.writeFileSync('/' + Number(new Date()) + '.txt', 'hi');

// comment out below to stop process immediately after writing
setInterval(function () {
	console.log('hi! ' + Number(new Date()));
}, 1000);