unleash.unleash/docs/getting-started.md

(unleash-server is currently not released yet with these capabilites, but when it is this is how to use unleash)

The simplest way to get started:

$ npm install unleash-server -g
$ unleash -d postgres://unleash_user:passord@localhost:5432/unleash -p 4242

Unleash started on port:4242

Or programmatically:

const unleash = require('unleash-server');

unleash.start({
  databaseUri: 'postgres://unleash_user:passord@localhost:5432/unleash'
  port: 4242
}).then(unleash => {
    console.log(`Unleash started on port:${unleash.app.get('port')}`);
});