RMKR Toolkit

Static, client-side developer utilities hosted at rmkr-dev.github.io.

Every tool runs in the browser. Transforms, hashes, diffs, and previews stay on your machine. There is no backend and no telemetry that leaves the tab with your payloads.

Run it locally

Open index.html in a browser, or serve the folder:

python3 -m http.server 8080

Then visit http://localhost:8080.

Skillbook and Promptbook load JSON over fetch, so use a local server (opening the HTML file via file:// will not load the catalogs).

Tools

Transform

• Payload Knife — pretty/minify JSON, JSON to CSV, cURL to fetch
• YAML ↔ JSON — convert and format
• CSV Convert — CSV, JSON, and YAML
• XML ↔ JSON / TOML ↔ JSON
• Encode / Decode — Base64, URL, HTML entities
• .env ↔ JSON, Query ↔ JSON, Headers Parser

Security

• JWT Debugger
• Hash Lab — SHA-256, SHA-1, MD5
• UUID Generator
• PEM / SSH Viewer
• CIDR Calculator — IPv4 network, broadcast, mask, host range
• Azure Resource ID — parse ARM IDs into subscription, RG, type, name

Time

• Time Overlay — timezone working-hour grid
• Unix Timestamp
• Cron Explainer

Data

• Markdown Viewer
• Payload Diff
• Mock Generator
• JSON Schema Studio
• Regex Tester
• SQL Formatter
• Markdown Table

Design

• Architect Draw
• Color Converter
• QR Code
• Sample Data
• Slugify

Dev helpers

• Roadmap Planner (saved in localStorage)
• Collab Pad (peer-to-peer scratch pad)
• Number Base
• Local Stats (counts stored only in this browser)

AI

Instruction packs and prompts for GitHub Copilot, Claude Code, and Codex only (no other agent runtimes are documented here).

• Skillbook (skillbook/) — browsable, searchable skills with when-to-use, tool targets, format notes, and a working Copy button. Data: skillbook/skills.json.
• Promptbook (promptbook/) — same UX for task prompts. Data: promptbook/prompts.json.
• AI hub (ai/) — thin landing page linking both.

How to add a skill or prompt

1. Append an object to the skills array in skillbook/skills.json or the prompts array in promptbook/prompts.json.
2. Required fields: id (unique kebab-case), title, whenToUse, tools (subset of copilot | claude-code | codex), tags (string array), formatNotes, body (the pasteable text).
3. Keep bodies original and practical. Note where each tool expects the text:
   • Copilot → .github/copilot-instructions.md or path-scoped *.instructions.md
   • Claude Code → CLAUDE.md for short facts; .claude/skills/<name>/SKILL.md for procedures
   • Codex → AGENTS.md (nested / override files as needed)
4. Run node scripts/site-check.mjs before opening a PR.

Site checks

GitHub Actions workflow .github/workflows/site-checks.yml runs on pull requests and pushes to main:

• Validates Skillbook / Promptbook JSON shape
• Ensures every tool path listed in assets/site.js has a matching index.html
• Basic HTML well-formedness for tool pages

node scripts/site-check.mjs

Notes

• Shared chrome lives in assets/site.css and assets/site.js.
• Small libraries used by a few tools are vendored under assets/vendor/.
• Existing tool URLs (/md, /jwt, /transform, and the rest) are unchanged.
• New pages set data-root and data-tool so the shared nav/footer inject correctly.