API and Backend Documentation
Show your team exactly how the authentication API works end-to-end, from the POST /api/auth/login call to the 200 OK response carrying access and refresh tokens.
AI Chart Template
Visualize Your Login Authentication Flow with a Sequence Diagram
Map every step from credential submission to JWT token issuance with a clear, editable sequence diagram built for engineers and security teams.
Chart preview
Visualize Your Login Authentication Flow with a Sequence Diagram
Map every step from credential submission to JWT token issuance with a clear, editable sequence diagram built for engineers and security teams.
fontSize13
enableZoomtrue
mirrorActorsfalse
showSequenceNumberstrue
Template
What This Template Offers
A production-ready sequence diagram covering the complete login authentication lifecycle — from user input to secure session establishment.
- 5 participants: User (actor), Browser, Auth Service, User Database, and Token Service
- 12 numbered messages spanning credential submission through dashboard redirect
- Activation bars showing Auth Service and Token Service lifetimes at a glance
- Inline security notes on HTTPS enforcement, bcrypt hashing, and token expiry windows
- Configurable font size, sequence numbers, and zoom/pan for large diagrams
Use cases
Perfect Use Cases
Security Review and Auditing
Present your login flow to security reviewers or auditors, highlighting bcrypt password hashing, HTTPS-only credential transport, and short-lived JWT access tokens.
Onboarding New Engineers
Help new developers understand the auth architecture quickly with a numbered, visual walkthrough of every service interaction and handoff.
Architecture Design and Planning
Use this as a starting point when designing or refactoring authentication systems — swap in your own services and adapt the flow to your stack.
Customize
How to Customize
Edit Participants
Add, remove, or rename actors and systems to match your architecture — for example, replace 'Auth Service' with 'Keycloak' or 'Auth0'.
Adjust the Message Flow
Modify message labels and arrow types, add activation bars for new services, or insert extra steps like MFA verification or rate-limit checks.
Add Context Notes
Attach notes to any participant to call out security requirements, SLA constraints, or implementation details your audience needs to know.
Key Benefits
- Full-cycle coverage — from user input all the way to session establishment in one diagram
- Security-first design — bcrypt, HTTPS, short-lived JWTs, and refresh token storage all documented
- Developer-friendly — sequence numbers and activation bars make message order unambiguous
- Instantly editable — no diagramming tool expertise required, just click and customize
Pro Tips
- Add an 'alt' block to show the failed-login branch (wrong password → 401 Unauthorized) alongside the happy path.
- Duplicate the Token Service messages to model a token-refresh flow in the same diagram without starting from scratch.
- Use the 'over' note style spanning Auth Service and Token Service to mark your trust boundary for compliance documentation.
Start now
Create Your Own Authentication Sequence Diagram
Describe your auth flow and get a ready diagram in seconds — no setup, no sign-up needed.
or upload your data file
- Free to start
- No sign-up required
- AI-powered
Related Tools
Create similar charts with these tools
AI Sequence Diagram Generatorsequence
Make clear sequence diagrams fast with an AI sequence diagram generator. Free, online, and customizable; export or embed easily. Start now, free.
Interaction Diagrams, InstantlysequenceBuild clear interaction diagrams instantly. Map system flows, API calls, and user journeys with our free AI-powered sequence diagram maker. No sign-up needed.
Sequence Diagram MakersequenceCreate professional sequence diagrams instantly with AI. Map system interactions, API flows, and user journeys — free online, no sign-up required.
UML Sequence Diagram MakersequenceCreate UML sequence diagrams instantly with AI. Map system interactions, API flows, and auth steps — no coding or diagramming tools needed. Free online.
API Sequence Diagram MakersequenceBuild clear API sequence diagrams online in minutes. Map request flows, system interactions, and auth handshakes — no Mermaid syntax or design tools required.
Message Sequence Chart MakersequenceCreate clear message sequence charts in minutes. Visualize system interactions, API flows, and communication patterns with free AI-powered generation.
Templates
Start with professionally designed templates
Policy Approval Sequence Diagram Templatesequence
Visualize your multi-step policy approval workflow — from draft submission to executive sign-off — with this ready-to-use sequence diagram template.
Policy Renewal Sequence DiagramsequenceMap the full insurance policy renewal process - from 60-day reminders to payment confirmation - with this ready-to-use sequence diagram template.
Sequence Diagram Template for System FlowssequenceVisualize system interactions step-by-step with our free sequence diagram template. Map API flows, order processing, and more — all in minutes.
API Call Sequence Diagram TemplatesequenceVisualize API request flows with JWT auth, gateway routing, and database writes. Free sequence diagram template for backend developers and architects.
UML Sequence Diagram TemplatesequenceVisualize system interactions with a ready-to-use UML sequence diagram template. Map auth flows, API calls, and microservice interactions — free online.