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Express.js Integration Guide for Passwordless Authentication with DID.app. DID.app is an Identity Provider that authenticates users by verifying access to either an email address or securely stored private key. This tutorial will require you to have Node.js and Express installed. It is best practise to keep your session secret out of your source code. We will use cookie-session so that we can keep a user signed in after we have authenticated them. We need a button that lets users sign in, or up, using the OpenID connect flow.