fp-backend
Helps your agent use functional programming in backends. It makes building robust and maintainable systems easier.
What it does
This tool helps build parts of a computer program (backend) using a programming style called 'functional programming'. It's particularly useful for those using Node.js or Deno languages who want their code to be safer and easier to test.
When to use it
- ✓When building a new computer program (backend) in Node.js or Deno.
- ✓When you need to organize how different parts of your program connect (dependency injection).
- ✓If you want to handle errors in a more organized and safer way in your code.
Example of what to ask your AI
“Help me set up a Node.js backend using functional programming patterns with fp-ts.”
Want more? Open the sections below.
How to use
The easiest way: copy the message below and paste it into Claude, ChatGPT, Cursor or any AI. It reads the skill and follows the instructions.
Skill link
Ready-to-paste message
How it works
It uses a library called fp-ts to apply functional programming principles. This helps create more predictable code and manage dependencies and errors in a structured way.
Installation
Easiest way: copy the skill link and paste it into Claude, ChatGPT or Cursor asking it to follow the instructions.
In the terminal (Claude Code, Codex, Cursor), in your project folder:
npx skills add sickn33/agentic-awesome-skills --skill fp-backendOr download just the file:
curl -L https://raw.githubusercontent.com/sickn33/agentic-awesome-skills/main/plugins/agentic-awesome-skills-claude/skills/fp-backend/SKILL.md -o SKILL.mdTechnical content (original SKILL.md)
Original text by the author, straight from GitHub.
fp-ts Backend Patterns
Functional programming patterns for building type-safe, testable backend services using fp-ts.
Detailed Guide
Read the detailed guide before executing this skill. It retains the complete procedure and reference material. Treat its safety, prerequisites, and validation requirements as mandatory. For focused work, load the relevant sections; for end-to-end work, read the guide completely.
When to Use
- You are building or refactoring a Node.js or Deno backend with fp-ts.
- The task involves dependency injection, service composition, or typed backend errors with
ReaderTaskEither. - You need functional backend architecture patterns rather than isolated utility snippets.
Limitations
- Use this skill only when the task clearly matches the scope described above.
- Do not treat the output as a substitute for environment-specific validation, testing, or expert review.
- Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.
FAQ
What is 'functional programming'?
It's a way of writing code that treats functions as building blocks, focusing on avoiding unexpected changes and making the code easier to understand and test.
What is fp-ts?
It's a library for JavaScript and TypeScript that brings the benefits of functional programming to these languages, helping to write safer and more organized code.
What are Node.js or Deno?
They are environments that allow running JavaScript (and TypeScript) code outside the browser, commonly used for building the 'back' part of websites and applications (the backend).
Details
Original description by the author
Functional programming patterns for Node.js/Deno backend development using fp-ts, ReaderTaskEither, and functional dependency injection
Popularity
- GitHub stars
- 48k
- Ranking position
- #3025
- License
- MIT
- Updated
- 10/15/2026
Comments
- …
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