FlowLens API Flow

See how your API is wired — without digging through files.

FlowLens analyses ASP.NET Core and FastAPI projects and builds an interactive map of your backend: controllers, routes, services, repositories, DTOs, and MVC views. Explore in the Tree sidebar or the Flow timeline, then click any node to jump straight to the code.

Supported frameworks

Framework	What FlowLens maps
ASP.NET Core	Controllers, MVC views, minimal APIs, routes & HTTP verbs, DI chains, DbContext, request/response DTOs
FastAPI	Routers, endpoints, Pydantic schemas, service layers, CRUD dependencies

Open a workspace with a .csproj or FastAPI project — FlowLens auto-detects and analyses on open.

Features

Tree view — hierarchical explorer grouped by controller
Flow view — vertical timeline of a controller's request path
Endpoints — GET /users, POST /books, etc. with request/response schemas
Click to jump — open the exact file and line from any node
Hover cards — quick preview of classes, methods, and properties

Getting started

Install FlowLens API Flow
Open an ASP.NET Core or FastAPI project
Click the FlowLens icon in the activity bar
Browse Tree or switch to Flow for the visual timeline

Run FlowLens: Analyse Project from the Command Palette to refresh after code changes.

Free vs Pro

	Free	Pro
Controllers	Up to 3	Unlimited
Tree & Flow views	✓	✓
Click to jump	✓	✓
Display settings	Default layout	Customize layers (endpoints, services, repos, schemas, views)

Upgrade: Command Palette → FlowLens: Upgrade to Pro
Activate: Command Palette → FlowLens: Activate Pro

Requirements

VS Code 1.85+
ASP.NET Core (.csproj) or FastAPI project