Visualise Your Codebase Architecture with Mermaid Diagrams
When you're knee-deep in an unfamiliar codebase, a diagram can explain in seconds what 30 minutes of reading can't. Ask Claude to generate a Mermaid diagram directly from your code.
Read the files in src/services and generate a Mermaid flowchart showing the relationships
and data flow between services.
Claude will produce diagram source you can paste straight into GitHub, Notion, or any Markdown-aware tool:
graph TD
AuthService --> UserService
UserService --> EmailService
UserService --> BillingService
BillingService --> WebhookService
You can get more specific about what you want to show:
Generate a Mermaid sequence diagram showing the full request lifecycle for
POST /api/checkout — include every service call, database query, and external
API interaction in order.
Or use it for planning rather than documentation:
I'm adding a notification system to this app. Generate a Mermaid diagram of
the proposed architecture based on the existing event system in src/Events.
Because Mermaid diagrams live as plain text in your repo, they stay in sync as your architecture evolves — just ask Claude to regenerate them after major refactors.
A diagram you didn't have to draw is a diagram you'll actually keep up to date.
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Set up Claude Code as an automated reviewer in your CI pipeline — on every pull request, it reads the diff, checks for bugs, security issues, missing tests, and convention violations, then posts its findings as a PR comment. Your human reviewers get a head start because the obvious issues are already flagged before they look.
Before deploying, tell Claude to read your project — migrations, environment variables, queue workers, scheduled tasks, caching, third-party integrations — and generate a deployment checklist that's specific to your app. Not a generic "did you run migrations?" list, but one that knows YOUR infrastructure and catches the things YOUR deploy can break.
Instead of writing a README from memory or copying a template, tell Claude to read your project and generate one that's actually accurate — real setup instructions from your config, real architecture from your directory structure, real API examples from your routes, and real prerequisites from your dependency files.