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Math Tasks Generator

Printable math worksheet generator (A4 PDF) for children aged 7–9. Claude Code-driven workflow: user describes a task idea → Claude generates JSON config → creates HTML pages with Tailwind CSS → converts to PDF via Puppeteer.

No template engine. Claude Code generates fresh HTML pages directly from JSON task configs each time.

Commands

npm run build:css          # Build Tailwind CSS (minified)
npm run build:css:watch    # Watch mode for CSS
npm run preview            # Serve HTML at localhost:3000
npm run dev                # CSS watch + preview server (concurrent)
npm run pdf -- <file>      # Convert HTML file to PDF

Generate problems from a task config:

node src/scripts/generate-problems.mjs tasks/<task>.json

Generate images via Banatie API:

node src/scripts/banatie.mjs --type background --prompt "forest theme" --output assets/backgrounds/forest.png
node src/scripts/banatie.mjs --type icon --prompt "golden star" --output assets/icons/stars/star1.png

Directory Structure

src/
  styles/main.css              — Tailwind source with A4/print styles
  scripts/
    generate-pdf.mjs           — HTML → PDF via Puppeteer
    generate-problems.mjs      — JSON task → concrete problem list
    banatie.mjs                — Banatie API client for image generation
tasks/                         — JSON task definition files
assets/
  backgrounds/                 — large background images per theme (~1200x1700px)
  icons/                       — icon sets in subfolders (128x128px transparent PNG)
output/
  html/                        — generated HTML (gitignored)
  pdf/                         — generated PDFs (gitignored)
  css/                         — built Tailwind CSS (gitignored)

JSON Task Format

Each task is a JSON file in tasks/ with this structure:

{
  "id": "multiply-2-3",
  "title": "Умножение на 2 и 3",
  "description": "Worksheet for practicing multiplication by 2 and 3",
  "template": "{a} × {b} = ___",
  "variables": {
    "a": { "type": "range", "min": 1, "max": 10 },
    "b": { "type": "set", "values": [2, 3] }
  },
  "problemCount": 20,
  "layout": {
    "columns": 2,
    "problemsPerPage": 20
  },
  "labels": {
    "title": "Умножение",
    "subtitle": "Реши примеры",
    "name": "Имя: _______________",
    "date": "Дата: _______________"
  },
  "theme": {
    "background": "assets/backgrounds/forest.png",
    "icons": "assets/icons/stars/",
    "iconReward": 1
  }
}

Fields

template — problem template with {variable} placeholders
variables — each variable is either range (min/max) or set (explicit values)
problemCount — how many problems to generate
layout.columns — 1 or 2 column layout
layout.problemsPerPage — max problems per A4 page
labels — all visible text (no hardcoded language)
theme.background — path to background image
theme.icons — path to icon directory (for collectible rewards)
theme.iconReward — show an icon every N problems solved

HTML Generation Guidelines

When generating HTML worksheets:

Page size: A4 = 210mm × 297mm. Use the .page-a4 class.
CSS: Link to ../css/styles.css (relative from output/html/)
Page breaks: Use break-after: page between pages. Each .page-a4 is one printed page.
Background images: Use absolute paths or paths relative to HTML location. Apply via .page-background as a full-page positioned image.
Icons: Inline small 128×128 images next to problems or as rewards.
Fonts: Use system fonts or Google Fonts loaded via <link>.
Print-friendly: Avoid shadows, gradients that don't print well. Test with npm run pdf.
Images in PDF: Use local file paths (not URLs). Puppeteer resolves file:// protocol.
Embed images as base64 data URIs when possible for reliable PDF rendering.

Banatie API

REST API for generating images.

Backgrounds: ~1200×1700px, themed illustrations (forest, space, ocean, etc.)
Icons: 128×128px, transparent PNG, simple collectible items (stars, gems, animals)

Configuration is in src/scripts/banatie.mjs. Set the BANATIE_API_KEY environment variable for authentication.

PDF Generation

Puppeteer settings for A4 worksheets:

Format: A4
printBackground: true (required for background images)
Margins: zero (CSS handles margins)
preferCSSPageSize: true

Workflow

User describes the math task idea to Claude
Claude creates/updates a JSON config in tasks/
Claude runs node src/scripts/generate-problems.mjs tasks/<task>.json to get concrete problems
Claude generates HTML file(s) in output/html/ using the problems and Tailwind classes
Run npm run build:css to compile CSS
Run npm run pdf -- output/html/<file>.html to create PDF
Preview with npm run preview at localhost:3000

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