Symphony Todo

Live Demo →

A small Node.js todo web app for testing OpenAI Symphony orchestration. It includes a browser UI, a JSON-backed todo model, and a simple HTTP API.

Features

• Create, complete, edit, and delete todos.
• Persist todos to data/todos.json.
• Add optional due dates with YYYY-MM-DD validation.
• Set priority to low, medium, or high; lists are sorted high to low.
• Add comma-separated tags and filter by tag through the API.
• Filter todos by all, active, or completed status.
• Search todo titles case-insensitively.
• Keep titles to 140 characters with frontend counters and backend validation.
• Toggle dark mode in the browser UI.

Usage

npm start        # Start server on port 3000
npm test         # Run tests

Open http://localhost:3000 in your browser.

The app serves public/index.html and stores todos in data/todos.json by default.

API

GET /api/todos

Lists todos sorted by priority. Supported query parameters:

• status: all, active, or completed (all by default)
• search: case-insensitive title search
• tag: exact tag match, case-insensitive

POST /api/todos

Creates a todo.

{
  "title": "Ship the README update",
  "dueDate": "2026-05-13",
  "priority": "high",
  "tags": "docs,symphony"
}

Fields:

• title is required, trimmed, and limited to 140 characters.
• dueDate is optional and must be a valid YYYY-MM-DD date.
• priority is optional and defaults to medium; accepted values are low, medium, and high.
• tags is optional and may be a comma-separated string or an array.

PATCH /api/todos/:id

Marks a todo as complete when called without a title field.

{}

Updates a todo title when title is provided.

{
  "title": "Updated title"
}

DELETE /api/todos/:id

Deletes a todo.

Data Persistence

Todos are written to data/todos.json as JSON after every create, complete, title update, or delete operation. The storage file preserves nextId so IDs keep increasing across restarts.

Testing

Run the model test suite with:

node test/todo.test.js

Symphony

This repo is designed as a testbed for Symphony. Create Linear issues like:

• "Add due dates to todos"
• "Add priority levels (low/medium/high)"
• "Persist todos to a JSON file"
• "Add search/filter functionality"
• "Add dark mode toggle"

Symphony agents will pick them up and submit PRs.