Share session among Express and SocketIo

[hasham7861]

How to Share 1 session between Express and SocketIo

Context: It took me sometime to figure out how to share a session between express app and socket.io. So I thought I share this simple code repo to contribute to this awesome community.

Note: this solution only works if the express and socket.io are hosted on single server and on one process. if you are using multiple processes. Then look into sticky sessions.

Now, how did I accomplished to share the session between express and socketio:

1. Send an initialize request to express server, which then establishes a connection between client and server.
2. Server then saves that session information inside a store and browser has a httpOnly Cookie saved.
3. Upon that first successful request, then a socket.io connection is established. This is key to sharing the same session.
4. The session is invalidated after 5 mins of inactivity.

Technologies used: Vue, Express, Socket.io, and Redis.

Checkout the repo: https://github.com/hasham7861/express-socketio-session.git

Contribution: Feel free to fork the repo, favourite, or provide any suggestions.