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Javascript Expert

Checked
martinholovsky·vlatest·backend·Unlicense

Generates, debugs, and optimizes complex Node.js code, APIs, and server-side JavaScript applications efficiently.

Repository

Install on your platform

Showing Claude Code. One command installs this skill into any of the agents below.

  1. 1

    Run this in your project

    terminal
    $ npx skills add martinholovsky/claude-skills-generator --skill javascript-expert -a claude-code

  2. Uses the open-source skills CLI and needs Node.js. Add -g to install it for your user instead of this project.

What we know about this skill

Publisher

martinholovsky

Taken from the source listing. We haven't verified who controls this account.

Install target

Live repository

Not pinned. Installing fetches whatever the repository holds at the time you run the command.

No human has reviewed this code. The checks below are a static scan of the files at one commit — nobody has run this skill or judged whether it works. A skill runs with whatever access you give your agent, so read the source before you install it.

Automated safety checks

scanned

This skill passed all 6 checks. We read its files at one commit and looked for the things that make a skill dangerous to run — not for whether it works.

  • Declares what it does: passed

    SKILL.md parses and declares a name and a description.

    SKILL.md exists, its frontmatter parses, and it declares a name and a description.

  • No undeclared network calls: passed

    Makes no network calls.

    Every host the skill dials — from its scripts, its config endpoints or the commands it tells the agent to run — is either well-known package and API infrastructure or declared in its own frontmatter. Links in documentation are not counted.

  • No obfuscated payloads: passed

    No encoded or obfuscated payloads.

    No base64, hex or compressed blob is decoded and then executed, and no encoded shell commands.

  • No credential access: passed

    Reads no keys, tokens, keychains or credential files.

    Neither the code nor the SKILL.md instructions read SSH keys, cloud credentials, keychains, token stores, browser cookie databases or dotfiles that hold secrets.

  • No pipe-to-shell installers: passed

    No pipe-to-shell or download-and-run installers.

    No `curl … | sh` pattern, in the code or in the instructions, that runs code fetched at run time.

  • Pinned to a commit: passed

    Scanned martinholovsky/claude-skills-generator at 1086ef2567.

    The exact upstream commit SHA that was scanned is recorded, so the result refers to specific bytes.

Commit
1086ef2567
Manifest
skills/javascript-expert/SKILL.md
Scanned
1 file, 1,093 lines
This is a static scan, not a review. It reads the skill's files; it does not run them, and it cannot tell you whether the skill is any good or whether the code does what its description says. A skill runs with whatever access you give your agent.
What each check looks for →

About this skill

What it does

This skill enables AI agents to generate, debug, and optimize complex Node.js code, APIs, and server-side JavaScript applications. It leverages deep expertise in modern JavaScript (ES6+), asynchronous programming patterns, security best practices, and performance optimization techniques. The agent adheres to principles like Test-Driven Development (TDD) and prioritizes writing clean, maintainable, and secure code.

When to use it

  • Generating new Node.js APIs or server-side JavaScript applications from scratch.
  • Debugging existing JavaScript codebases, identifying performance bottlenecks, and suggesting optimizations.
  • Refactoring legacy JavaScript code to improve readability, security, and maintainability.
  • Writing unit and integration tests for JavaScript applications using testing frameworks like Jest, Vitest, or Mocha.
  • Auditing dependencies for vulnerabilities and implementing secure coding practices.

Key capabilities

  • Proficiency in modern JavaScript (ES6+ features).
  • Expertise in asynchronous programming with Promises, async/await, and event loop management.
  • Knowledge of runtime environments including Node.js, browsers, Deno, and Bun.
  • Ability to apply functional programming principles like higher-order functions and closures.
  • Understanding of object-oriented programming concepts (prototypes, classes, inheritance).
  • Implementation of security best practices for XSS prevention, prototype pollution mitigation, and dependency vulnerability management.
  • Performance optimization techniques including memory management, bundling, and tree-shaking.

Example prompts

  • "Write a Node.js API endpoint that handles user authentication using JWT."
  • "Debug this JavaScript code snippet and identify any potential performance issues: [code snippet]"
  • "Refactor this legacy JavaScript function to use async/await for improved readability: [function code]"

Tips & gotchas

  • The skill prioritizes TDD, so providing failing tests upfront can guide the agent towards a more robust solution.
  • Be specific about the desired runtime environment (Node.js, browser, etc.) when requesting code generation.
  • Security is a core principle; always review generated code for potential vulnerabilities.