nginx-proxy-manager/backend/db.js

const config = require('config');

if (!config.has('database')) {
	throw new Error('Database config does not exist! Please read the instructions: https://github.com/jc21/nginx-proxy-manager/blob/master/doc/INSTALL.md');
}

let data = {
	client:     config.database.engine,
	connection: {
		host:     config.database.host,
		user:     config.database.user,
		password: config.database.password,
		database: config.database.name,
		port:     config.database.port
	},
	migrations: {
		tableName: 'migrations'
	}
};

if (typeof config.database.version !== 'undefined') {
	data.version = config.database.version;
}

module.exports = require('knex')(data);