JavaScript AI Skill: Node.js Code, Async Fixes & Tests

Name: AI Skill for JavaScript
Brand: KissMySkills
Price: 19 USD
Availability: InStock

AI Skill for JavaScript

Turn Claude into a senior JavaScript pair programmer for browser and Node.js code, reviews and debugging.

$19 this skill one payment yours forever

Prompt file instant downloadai-skill-for-javascript.txt

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One file, paid once. No updates, no connector.

Costs about the same as 2 months of Library.

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How it works

Ask it something hard.

📎 ai-skill-for-javascript.txtLOADED ✓

My loop fetches 20 user profiles one after another and takes 8 seconds. Node 20, ESM. How do I speed it up?

CLAUDE · WITH THIS SKILL You get: the cause in one line (awaits inside the loop run sequentially) -> a runnable ESM function that fires all fetches and awaits them with Promise.allSettled -> per-request error handling that keeps the successful profiles -> a one-line why on allSettled vs all -> a note on capping concurrency if the API rate-limits -> the single next action: swap the loop in and compare timings with console.time.

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0:16 · no sound

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Questions before you buy? A person answers, usually the same day: hello@kissmyskills.com

// the file itself

Read it before you buy it.

The first lines of the file your AI will read, exactly as delivered. Nothing rewritten for the page.

// the skill your AI runs on

You are a senior JavaScript pair programmer in the browser and in Node.js who explains the event loop, replaces sequential awaits with Promise.all, and finds the real bug in pasted code. You have been activated to write, review and debug the user's JavaScript.

KissMySkills.com | Install: paste this whole file into Claude Projects (Project instructions), a custom GPT (Instructions), a Gemini Gem, or your AI's system prompt. Then just ask questions the way you normally would. You are a senior JavaScript pair programmer sitting next to the user while they write, debug and ship JavaScript in the browser and in Node.js. You know the language and its quirks, the runtimes, the package ecosystem and the tooling, and you hand over code that runs, reviews that find real bugs, and explanations that make the event loop click. You are the helper inside the user's JavaScript work, not a job-role persona. Tone: direct, practical, code first. · Language: let and const scoping, closures, prototypes and classes, this binding, arrow functions, destructuring, spread and rest, optional chaining, nullish coalescing, iterators and generators, Symbols, Proxy and Reflect. · Async: the event loop, microtasks vs macrotasks, Promises, async/await, Promise.all, allSettled, race and any, AbortController, missing await in loops, unhandled rejections. · Coercion: == vs ===, truthy and falsy, typeof quirks, NaN, number precision, Date pitfalls. · Modules: ES modules vs CommonJS, dynamic import, "type": "module", interop pain points, package exports maps. · Browser APIs: DOM, events and delegation, fetch, localStorage, IntersectionObserver, Web Workers, history and URL APIs. · Node.js: fs, path, process, streams, events, child_process, http, worker_threads, npm and npx, package.json scripts, node --inspect, process.env. · Tooling: npm, pnpm, yarn; ESLint and Prettier; Vite, webpack, esbuild, Rollup; Babel; TypeScript or JSDoc types. · Testing: Jest, Vitest, Playwright, testing-library. · Frameworks on request: React, Vue, Svelte, Angular, Express, Fastify, Next.js. · Debugging: DevTools Console, Sources with breakpoints, Network, Performance and Memory panels; console.table; the debugger statement; source maps. · Performance and security: reflow and repaint, debouncing, memoisation, listener and timer leaks, code splitting; XSS via innerHTML, CSP, input sanitising, prototype pollution. · Runtime: browser, Node.js (major version), Deno or Bun.

86 lines · .txt · instant download

// what's inside

What's inside this skill

Runnable ESM or CommonJS code with stated runtime assumptions
Async rewrites with Promise.all, allSettled and AbortController
Error diagnosis with DevTools steps and the minimal fix
Jest or Vitest tests and package.json or bundler config repairs

Frontend, full-stack and Node.js developers who write and debug JavaScript every day.

// two ways to get it

Use it inside your AI, or download it once.

Library plan

This skill and 2,500+ others, inside your chat

$9/mo cancel anytime, or $59 a year

All 2,500+ skills, prompt packs and agents, loaded the moment you ask
Nothing to download or paste: connect once in Claude, ChatGPT, Claude Code or Cursor
New skills every week and 10 catalog files a month to download

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Just this skill, as a file

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Download after checkout and paste it into any AI chat
One file, no updates, no connector
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Already on Library or Both? This one is included, no need to buy the file.

Works with

Trademarks of their respective owners. KissMySkills is not affiliated with or endorsed by them.

// ask your assistant

Or let your AI set up this skill for you.

Go to kissmyskills.com/pages/connector and set up the "AI Skill for JavaScript" skill (handle: ai-skill-for-javascript) for me

Paste it into Claude, ChatGPT, Claude Code, Cursor or Codex. Your AI walks you through connecting KissMySkills (about 3 minutes, 7-day free trial) and loads the skill. What your AI will read →

What you're actually buying

This Claude/ChatGPT skill is a JavaScript AI pair programmer inside your daily coding work: it writes runnable functions, modules and Node scripts for the runtime you name, rewrites slow sequential awaits into Promise.all flows, reviews pasted code for async mistakes and XSS risks, diagnoses errors like "Cannot read properties of undefined" or ESM vs CommonJS conflicts, and writes Jest or Vitest tests with mocks and fake timers.

It knows the event loop, closures and this binding, ES modules, browser APIs, Node.js core modules, npm and bundlers like Vite and esbuild, plus how to confirm a cause in DevTools. It is a helper in your JavaScript work, not a job-role persona, and it does not run or deploy code itself; it hands you the code and the command to verify it.

Works the same way in Claude, ChatGPT and Gemini. One purchase, download the file, install it in under 2 minutes, then paste your snippet or error and get a fix with the reasoning.

// how to install Under 2 minutes

Four steps. Any AI chat.

01
Download the file
After checkout, the download link lands in your inbox. Save the .txt file anywhere on your device.
02
Open your AI chat
Any AI chat you already use: Claude, ChatGPT, Gemini, Grok, Copilot or another.
03
Paste the prompt
Open the .txt file, copy the prompt section and paste it into Claude or ChatGPT - or add it to a Project so it is always there.
04
Start working
Your AI is now configured as a specialist. Ask it anything inside its domain.

No technical knowledge required.

With Library there is nothing to download. Connect your AI once, then ask for any skill by name.

Setup guide → Library · $9/mo →

// faq

Questions about this product

What does the AI Skill for JavaScript do?+

It turns Claude or ChatGPT into a JavaScript AI pair programmer that writes runnable code for browser and Node.js, fixes async and module problems, reviews your JavaScript for bugs and security issues, and writes Jest or Vitest tests.

Does it run or deploy my JavaScript for me?+

No. It does not execute anything. It gives you the JavaScript code, the config change or the DevTools steps, and tells you what to run to verify the result yourself.

Does it cover Node.js as well as browser JavaScript?+

Yes. It asks which runtime you target (browser, Node.js version, Deno or Bun) and which module system you use, then writes JavaScript that fits: fs and streams on Node, DOM and fetch in the browser.

Can it work with React, Vue or Express code?+

Yes, when you name the framework. It keeps plain JavaScript separate from framework patterns so you get idiomatic code for React, Vue, Svelte, Express or Fastify rather than a mix.