nthtime

Drill code patterns until they're muscle memory.

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Write real implementations from a blank canvas -- route handlers, hooks, middleware, models, and more. Get instant structural feedback powered by Tree-sitter AST analysis -- no code execution, no test runners. Just parse, verify, repeat.

For developers who know the concepts but reach for docs every time. Maintain fluency across stacks, lock in new patterns, internalize idioms fast.

Features

• AST-based verification -- 12 evaluators check structure, not strings. Runs entirely in the browser via Tree-sitter WASM. Supports JS, TS, TSX, Python, HTML, CSS.
• Progressive feedback -- 5 levels from bare pass/fail (L0) up to full diff against the reference solution (L4). Start strict, dial up when stuck.
• Multi-file challenges -- Single functions to complete app structures with routing, middleware, models. Scaffolded or blank canvas.
• Full editor -- Monaco with syntax highlighting, Vim/Emacs modes, file tree, tabs. Cmd+Enter to submit, Cmd+S to format.
• Time tracking -- Timer starts on first keystroke. Race yourself. Watch the times drop.
• Draft autosave -- Work-in-progress persists to localStorage. Close the tab, come back later, pick up where you left off.

Quick start

git clone https://github.com/spencerjireh/nthtime.git
cd nthtime
pnpm install
pnpm dev

For full-stack development, start Spring Boot and PostgreSQL with docker compose up alongside the dev server. See the getting started guide for full setup.

Challenge packs

A growing library of packs across frameworks and languages. Current packs include Express, React, and FastAPI -- with more on the way.

Packs are portable JSON -- author your own with a reference solution and structural assertions.

Tech stack

Frontend	Next.js 16, React 19, Tailwind v3, shadcn/ui
Backend	Spring Boot 3.5 + PostgreSQL 16
Verification	Tree-sitter WASM (client-side)
Editor	Monaco
State	Zustand 5 (vanilla stores)
Testing	Vitest 4 + Playwright
Monorepo	Nx 22.5 + pnpm 10

Project structure

apps/web/          Next.js frontend
libs/
  shared/          Types: Pack, Challenge, Assertion, Verification
  data-access/     Repository interfaces
  verification/    Tree-sitter verification engine (12 evaluators)
  editor/          Zustand store, language mapping, draft storage
services/api/      Spring Boot backend (Java 25, PostgreSQL 16)
packs/             Challenge pack JSON (git-versioned)
tools/             CLI: validate-packs, seed

Docs

Full documentation at spencerjireh.github.io/nthtime -- architecture, pack authoring, verification engine, contributing.

License

AGPL-3.0