Meteor 3.5 Launches accounts-express to Unify Meteor and Express Authentication

Meteor 3.5 has introduced accounts-express, a new package that connects Express routes to Meteor's existing authentication system. Previously, developers needed custom middleware or separate session logic to use Meteor user credentials within Express endpoints. The package works by reading a Meteor login token from incoming requests and attaching the resolved user ID to req.userId, making it available throughout the Express handler chain. It also ships an authentication-aware fetch client, allowing browser code to automatically include login tokens when calling protected endpoints. This integration is designed to extend Meteor Accounts to HTTP routes without replacing or duplicating the app's existing authentication setup.