Langchain for Node.js server applications

Hi All, there are many resources on how to use Langchain in a Jupiter notebook or in simple Node.js scripts. However, most LLM applications live on a web server and I didn’t find many resources on how to handle common problems on web servers (importantly how to manage memory for conversations, for example). In particular I’m interested in Node.js servers using either Express.js or Nest.js, are there any resources available to the community?