JavaScript Generator
Commercial use OK
380+ models
No watermark
No sign-up needed
Model:
+ GPT-5, Claude, Gemini
Describe what you need and get modern ES2023+ JavaScript - async/await, optional chaining, top-level await in ESM, native fetch. 8 style presets including Vanilla browser, Node 20 ESM, React, Vue 3, Svelte 5, Express, and Cloudflare Workers. For full type-safety pick our /code/typescript/ generator instead.
Explanation
Advanced options
Result
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Generate JavaScript code with AI for free.
How to Use JavaScript Generator
1
Enter your input
Type text, upload a file, or describe what you want. No account needed.
2
Click generate
Our AI processes your request in seconds using the best open-source models.
3
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Use this tool via API
Automate this tool from your own code. OpenAI-compatible REST endpoint, Bearer-token auth, no extra SDK required. Token costs match the web interface.
curl -X POST https://api.free.ai/v1/chat/ \
-H "Authorization: Bearer sk-free-..." \
-H "Content-Type: application/json" \
-d '{"model": "qwen-coder", "messages": [{"role": "user", "content": "Write a Python function that reverses a string."}]}'JavaScript Generator — FAQ
Modern ES2023+ JavaScript - async/await, optional chaining, top-level await in ESM, native fetch, structured clone. 8 style presets (Vanilla browser / Node 20 ESM / React hooks / Vue 3 composition / Svelte 5 / Express + Prisma / Cloudflare Workers / Vitest tests). Outputs include the exact npm install line as a top comment when third-party packages are used. JavaScript on its own - for full type-safety pick our /code/typescript/ generator instead.
Yes - a typical React component or Express handler costs ~1,400 tokens on the default Qwen 3 Coder model, well inside the 2,500 anonymous or 10,000 signed-up daily pool. No credit card. Premium Claude Sonnet 4 or GPT-5 are available per-call for tricky multi-file generation.
GitHub Copilot ($10 individual / $19 business / $39 enterprise per month) is an IDE autocomplete - it finishes the line you are typing, but you still type the scaffolding. Cursor ($20/mo Pro) is a full VS Code fork with chat. Our generator is web-based and one-shot - paste a description, get a complete working module. Tabnine ($12/mo Dev) and Codeium ($15/mo Pro, free tier) compete with Copilot on autocomplete; Cline and Continue are free open-source alternatives.
Yes - pick the matching style preset. React output uses function components + hooks (no classes), Vue 3 uses script setup composition API with refs and computed, Svelte 5 uses runes ($state, $derived) where appropriate. Imports use the modern ESM patterns each framework expects.
Pick the Node 20 ESM style. Output uses package.json type module, the global fetch / URL / crypto.subtle, import readFile from node:fs/promises, no CommonJS require. Works under Node 18+ with --experimental-fetch fallbacks where needed. For Workers / edge environments, pick the Cloudflare Workers preset.
Pick the Vanilla browser preset for code that drops into a script type module tag - no build step, no transpiler. Uses native ES modules, querySelector, addEventListener, fetch, AbortController. Tested patterns work in evergreen Chrome / Firefox / Safari.
Toggle the Include vitest tests extra above the Generate button. Output includes a *.test.js file using Vitest - describe / it nesting, vi.fn() mocks, vi.useFakeTimers() where async timing matters, expect with proper matchers. For Jest output, mention Jest in your description.
Yes - switch to the Paste starter / stub tab and drop in a function signature, partial class, or an interface (we treat JSDoc types as type hints). The model fills in the body without renaming or reorganizing your code.
Async/await everywhere - never .then() chains, never callbacks. Promise.all for parallel work, Promise.allSettled when partial failures are acceptable, AbortController + AbortSignal for cancellation. Top-level await in ESM contexts. Errors thrown with cause for proper chaining.
Yes - optional chaining, nullish coalescing, logical assignment, structuredClone, Object.hasOwn(), Array.at(-1), Object groupBy / Map.groupBy where target supports it. The version of JS targeted is set by your style preset.
Review every output as you would any pull request. The model writes correct, idiomatic JavaScript for common patterns but cannot know your runtime constraints, security posture, or full system architecture. For security-sensitive code run /code/review/ with security focus on the output, then /code/test/ to generate tests.
Yes - POST to /v1/chat/ with the same system prompt this page builds. Bearer auth, rate-limited per the standard pricing. Good for build-pipeline code-generation or browser extensions. Docs at /api/.
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