Building Scalable n8n Workflows: How to Use OAuth 2.0 for Multi-User Workflows

The greatest challenge for n8n has always been in credential reuse i.e. if you have a workflow connecting to an app, you can not pass the credentials dynamically. You will find each node can only use a static credential and this can't be done dynamically

In the case you are building a Gmail manager, you will need to deploy a new agent for each Gmail account, or use multiple nodes with the user credentials. Not scalable

I dedicated tens of hours researching how to solve this and create one workflow that can be used within a whole organization without having to recreate it for each users credential in n8n AKA collecting external credentials for use in n8n

The solution? An oath workflow that allows users to log in with their own accounts and grant you permissions to what you need.

What you need

1. n8n account
2. Access to the google account property
3. Google Console account for the client ID and Secret
4. Knowledge on the HTTP node

Continue reading the blog here

Happy productivity!