Web · Beginner
TaskFlow: Full-Stack Task App with Auth
Build a task manager where users sign up, log in, and CRUD their own tasks backed by a real Postgres database.
TaskFlow is a full-stack task management app where each user can create an account, log in, and manage their own private task list. You will wire together Next.js App Router server components, Supabase Auth, and a Postgres database with row-level security so that no user can ever see another user's data. This is one of the most practical beginner projects because it covers every layer of a real web application: authentication, a relational database, server-side data fetching, and a responsive UI.
What you build
- Users can sign up and log in with email and password via Supabase Auth
- Each user sees only their own tasks, enforced by Postgres row-level security policies
- Tasks can be created, marked complete or incomplete, and deleted
- A loading and empty state are shown while data is fetched from the server
- Auth state persists across page refreshes using Supabase session cookies
- Responsive layout built with Tailwind CSS that works on mobile and desktop
What it teaches
- How Postgres row-level security enforces data isolation at the database layer
- How to use Supabase Auth with Next.js App Router server components and middleware
- The pattern of Server Actions for form submissions that mutate data without a separate API route
- How to structure a Next.js project with shared Supabase client utilities for browser and server contexts
- The basics of relational database design: tables, foreign keys, and user-scoped data
How it works
- 1
Browser
- User submits form or loads page
- 2
Next.js Middleware
- Checks Supabase session cookie
- Redirects to /login if unauthenticated
- 3
Server Component / Server Action
- Reads or writes data using the server Supabase client
- 4
Supabase Postgres
- Row-level security checks user_id = auth.uid()
- Returns only the requesting user's rows
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Take it further
- Add due dates to tasks and sort the list so overdue tasks appear at the top with a visual warning.
- Allow users to organize tasks into named projects or categories, each stored as a related table with its own RLS policies.
- Replace email/password auth with OAuth (GitHub or Google) using Supabase's built-in provider support.
