MyMapOAuth Login Flow (Sequence)
A sequence diagram mapping the full OAuth 2.0 login flow — from user click through token exchange, session creation, and dashboard redirect.
Preview
“Map out the OAuth login flow for our app”
About the framework
Sequence Diagram Framework for Authentication Flows
This template applies the sequence diagram framework to the OAuth 2.0 authorization code flow — one of the most important and frequently misunderstood processes in modern web development. Sequence diagrams are uniquely suited to authentication flows because they show the exact order of messages between multiple actors, making protocol-level behavior explicit and reviewable.
The five participants — User, Browser, API Server, OAuth Provider, and Database — represent every system involved in a typical social login. The diagram traces the full flow: initial click, redirect to provider, authorization code return, token exchange, database upsert, session cookie creation, and final dashboard redirect. Every step is labeled with the exact action taken, making this a living specification that developers can implement from and security engineers can audit against.
Sequence diagrams are the standard tool for documenting API integrations, onboarding new engineers, and conducting security reviews. This template is production-tested for OAuth 2.0 with providers like Google, GitHub, and Microsoft. Use it as a reference implementation, then ask the AI to adapt it to your specific provider, add refresh token handling, or model a magic link email flow.
What's included
What you get
- Sequence diagram with 5 participants
- Full OAuth 2.0 authorization code flow
- Token exchange and session creation steps
- Database upsert and cookie handoff
- Clean actor/participant layout
OAuth Login Flow (Sequence)
Frequently asked questions
Common questions
Can I adapt this for a different auth provider like GitHub or Microsoft?
Yes. The OAuth 2.0 authorization code flow is standard across providers. You can ask the AI to update the participant labels and any provider-specific endpoint names. The core message sequence will remain the same.
How do I add refresh token handling to this diagram?
You can ask the AI to extend the diagram: 'Add a refresh token flow that activates when the access token expires, showing the API Server calling the OAuth Provider to get a new access token.' The sequence will be inserted after the initial token exchange.
Can I use this template for a magic link or passwordless auth flow?
Yes, though the participants and messages will differ significantly. Describe your magic link flow to the AI — 'Show User entering email, API generating a signed link, Email Service sending it, and User clicking to create a session' — and it will generate the appropriate sequence.
Is this diagram useful for security audits?
Absolutely. Sequence diagrams are a standard artifact in security reviews because they make data flows and trust boundaries explicit. You can share this diagram with a security engineer to review token handling, session creation, and database write operations.
OAuth Login Flow (Sequence)
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