TaskFlow API

A multi-tenant team collaboration REST API for managing workspaces, projects, tasks, and team members — built with ASP.NET Core and Clean Architecture.

TaskFlow lets teams of any size — from a group of friends to a company department — organize their work inside shared workspaces, track project progress, manage tasks with priorities and deadlines, and communicate through comments.

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Tech Stack

• Framework: ASP.NET Core (.NET 10)
• Architecture: Clean Architecture (Core / Infrastructure / API)
• Database: SQL Server with Entity Framework Core 10
• Authentication: ASP.NET Core Identity + JWT Bearer tokens
• API Docs: Swagger UI (Swashbuckle)

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Architecture

The solution is split into three projects following Clean Architecture principles:

• TaskManager.Core — entities, interfaces, DTOs, enums, and exceptions. No external dependencies.
• TaskManager.Infrastructure — EF Core DbContext, entity configurations, migrations, and service implementations.
• TaskManager.API — controllers, middleware, and the application entry point.

Dependencies only flow inward: API → Infrastructure → Core. The Core layer knows nothing about HTTP or databases.

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Features

• JWT Authentication — register and login with secure token-based authentication
• Role-Based Authorization — three workspace roles (Owner, Manager, Member) with different permissions enforced at the service layer
• Workspace Management — create workspaces, invite members, promote/demote roles, remove members
• Project Management — organize work into projects scoped to a workspace
• Task Management — create tasks with title, description, priority, deadline, and assignee; any member can update task status independently
• Comments — comment on any task; authors and moderators can delete comments
• Pagination & Filtering — filter tasks by status, priority, assignee, and deadline with page-based pagination

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Role Permissions

Action	Owner	Manager	Member
Delete workspace	✅	❌	❌
Invite members	✅	✅	❌
Promote to Manager	✅	❌	❌
Remove members	✅	✅*	❌
Create / update / delete projects	✅	✅	❌
Create / update / delete tasks	✅	✅	❌
Update task status	✅	✅	✅
Comment on tasks	✅	✅	✅
Delete own comment	✅	✅	✅
Delete any comment	✅	✅	❌

*Managers can only remove Members, not other Managers or the Owner.

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API Endpoints

Auth

Method	Endpoint	Description
POST	/api/auth/register	Register a new user
POST	/api/auth/login	Login and receive JWT token

Workspaces

Method	Endpoint	Description
GET	/api/workspace	Get all workspaces for current user
GET	/api/workspace/{id}	Get workspace by ID
POST	/api/workspace	Create a new workspace
PUT	/api/workspace/{id}	Update workspace
DELETE	/api/workspace/{id}	Delete workspace (Owner only)

Workspace Members

Method	Endpoint	Description
GET	/api/workspace/{workspaceId}/members	List all members
POST	/api/workspace/{workspaceId}/members	Invite a member by email
PUT	/api/workspace/{workspaceId}/members/{userId}/promote	Promote member to Manager
DELETE	/api/workspace/{workspaceId}/members/{userId}	Remove a member

Projects

Method	Endpoint	Description
GET	/api/workspace/{workspaceId}/projects	Get all projects
GET	/api/workspace/{workspaceId}/projects/{projectId}	Get project by ID
POST	/api/workspace/{workspaceId}/projects	Create a project
PUT	/api/workspace/{workspaceId}/projects/{projectId}	Update a project
DELETE	/api/workspace/{workspaceId}/projects/{projectId}	Delete a project

Tasks

Method	Endpoint	Description
GET	/api/workspace/{workspaceId}/projects/{projectId}/tasks	Get tasks (with filtering & pagination)
GET	/api/workspace/{workspaceId}/projects/{projectId}/tasks/{taskId}	Get task by ID
POST	/api/workspace/{workspaceId}/projects/{projectId}/tasks	Create a task
PUT	/api/workspace/{workspaceId}/projects/{projectId}/tasks/{taskId}	Update a task
PUT	/api/workspace/{workspaceId}/projects/{projectId}/tasks/{taskId}/status	Update task status only
DELETE	/api/workspace/{workspaceId}/projects/{projectId}/tasks/{taskId}	Delete a task

Task Filtering Query Parameters

Parameter	Type	Example
status	enum	?status=InProgress
priority	enum	?priority=High
assignedToId	string	?assignedToId=userId
deadlineBefore	datetime	?deadlineBefore=2026-08-01
page	int	?page=2
pageSize	int (max 50)	?pageSize=10

Comments

Method	Endpoint	Description
GET	/api/workspace/{workspaceId}/projects/{projectId}/tasks/{taskId}/comments	Get all comments
GET	/api/workspace/{workspaceId}/projects/{projectId}/tasks/{taskId}/comments/{commentId}	Get comment by ID
POST	/api/workspace/{workspaceId}/projects/{projectId}/tasks/{taskId}/comments	Add a comment
PUT	/api/workspace/{workspaceId}/projects/{projectId}/tasks/{taskId}/comments/{commentId}	Edit a comment (author only)
DELETE	/api/workspace/{workspaceId}/projects/{projectId}/tasks/{taskId}/comments/{commentId}	Delete a comment

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Getting Started

Prerequisites

• .NET 10 SDK
• SQL Server (local or remote)

Setup

1. Clone the repository

git clone https://github.com/zezoz5/TaskFlow.git
cd TaskFlow

2. Create your local settings file

Create appsettings.Development.json inside TaskManager.API/ — this file is git-ignored and must never be committed:

{
  "ConnectionStrings": {
    "DefaultConnection": "Server=YOUR_SERVER;Database=TaskFlowDb;Trusted_Connection=True;TrustServerCertificate=True"
  },
  "Jwt": {
    "Key": "YOUR_SECRET_KEY_AT_LEAST_32_CHARACTERS_LONG",
    "Issuer": "TaskFlowAPI",
    "Audience": "TaskFlowClient",
    "ExpireDays": 7
  }
}

3. Apply migrations

cd TaskManager.API
dotnet ef database update

4. Run the API

dotnet run --launch-profile https

5. Open Swagger UI

Navigate to https://localhost:7173/swagger to explore and test all endpoints.

To authenticate in Swagger: call /api/auth/login, copy the token from the response, click the Authorize button, and paste the token.

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Tests

Unit tests cover the service layer's authorization logic using xUnit and EF Core's InMemory provider.

dotnet test

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Demo

A visual demo page is included to explore the API without needing Swagger.

1. Make sure the API is running
2. Open demo/index.html in your browser
3. Register or login, then explore workspaces, projects, tasks, and members live

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What I Learned

• Implementing Clean Architecture in a real project — keeping domain logic completely independent of HTTP and database concerns
• JWT authentication from scratch — token generation, claim mapping, and the MapInboundClaims = false gotcha
• Role-based authorization enforced at the service layer, not just at the controller level
• EF Core navigation properties — when .Select() auto-joins vs. when .Include() is required
• Guard clause pattern for cleaner, more readable authorization logic
• Pagination and filtering using incremental LINQ query building
• Real debugging skills — tracing 401 errors through middleware, claim inspection, package version conflicts
• Unit testing service-layer logic with xUnit and EF Core's InMemory provider — seeding related entities through navigation properties (not just foreign key values) to satisfy relationship constraints, and asserting on exception messages, not just types, after catching a test that was passing for the wrong reason

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Future Work

• Refresh Tokens — short-lived access tokens with long-lived refresh tokens for production-ready authentication
• OAuth 2.0 — Google/GitHub login for verified emails and frictionless registration
• Integration Testing — end-to-end API testing with WebApplicationFactory
• CI/CD — automated build and deploy pipeline with GitHub Actions
• Deployment — host the API on Azure with a cloud SQL Server instance

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A Note from the Developer

TaskFlow was built as a learning project with one goal in mind: to move beyond CRUD APIs and understand how maintainable backend applications are designed.

Every project I build focuses on learning something new, and TaskFlow represents my journey into Clean Architecture, role-based authorization, and multi-tenant application design.

There are still many improvements I'd like to make, but I'm proud of how much this project taught me.