Can't reach webside with pm2

I am trying to run HackMD(http://ift.tt/1E9PZ57) project on my laptop with pm2, I can see the status is online with the command pm2 show 0 but I cannot open the page with browser with the URL http://localhost:3306, it showed 'This side can't be reached', does anyone know what's wrong?

[config.json] { "development": { "domain": "localhost", "db": { "username": "", "password": "", "database": "hackmd", "host": "localhost", "port": "3306", "dialect": "mysql" } },

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