[Node.js] connection.session.store cannot read property of undefined
I recently ran into a problem whereby when attempting to use session-mongoose for session storage via MongoDB in a Node.js application, I was being hit with the error:
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connection.session.store cannot read property of undefined |
After Googling this with Bing and some other search engine jiggery-pokery I came up blank. Lots of references from a few years back which were down to a number of factors, but nothing relevant to my particular error.
Looking at my code:
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var MongoSessionStore = require('session-mongoose')(session); var sessionStore = new MongoSessionStore({ url: credentials.mongo.development.connectionString }); app.use(require('express-session')({ store: sessionStore })); |
And looking at the Github page for session mongoose there was nothing obviously wrong with what I was doing. Thus I started poking around in the node_modules folder to try and find out what is going on.
It turns out that as Express and Connect have been largely decoupled, the Session middleware I no longer party of the connect object. However, session-mongoose hasn’t been updated to reflect this and thus it was still referencing connect.session.store. The Session object is no longer a property on the connect middleware, so the simple fix was to change the passed in parameter to session-mongoose function to connect.Store (/node_modules/session-mongoose/index.js:266).
As is often the case, Node.js is still a very immature technology and the rate of change if its components and add-ins continues to cause compatibility and dependency problems, despite the best efforts of NPM.
I'm a gadget loving code-junkie who loves to program, create websites and try out new stuff. Married, with two young daughters I am also a keen marathon runner and fitness enthusiast.