title: How can I use a single mssql connection pool across several routes in an Express 4 web application?
body: <p>I want to use <a href="https://github.com/patriksimek/node-mssql" rel="noreferrer">node-mssql</a> as a MSSQL database connector in a Node JS Express 4 web application. Route handler logic is handled in separate files.</p>
  
  <p>How do I create a single/global connection pool and use it across several files where route logic is handled? I don't want to make a new connection pool in each route handler function/file.</p>