Write, run, and debug JavaScript and TypeScript directly in your browser. Powered by Monaco Editor, instant type checking, npm package support, live browser preview, and autonomous AI pair programming.
Everything you need to write clean, type-safe, and performant JavaScript and TypeScript code.
The industry-standard editor powering VS Code. Enjoy syntax highlighting, intelligent autocompletions, parameter hints, auto-closing tags, and instant error diagnostics.
Install packages effortlessly from the npm registry using the cloud terminal. Import libraries directly into your ES modules or TypeScript scripts.
@types/* resolutionTest DOM manipulation, HTML5 canvas, Web APIs, and client-side JavaScript with instant live reloading in a synchronized preview frame.
Run Jest, Vitest, or Mocha test suites with normalized result reports in the Tests panel. View assertion diffs and jump to failing test cases.
Ask the AI assistant to write complex algorithms, convert JavaScript to strictly typed TypeScript, fix asynchronous bugs, and optimize event loop performance.
Execute scripts both in the browser DOM environment and on the server via Node 20 LTS in the integrated cloud terminal.
Experience strict typing, generic interfaces, and clean async execution in OnlineAIIDE.
interface ApiResponse<T> {
data: T[];
total: number;
status: 'success' | 'error';
}
interface DeveloperProject {
id: string;
name: string;
language: 'javascript' | 'typescript' | 'python' | 'java' | 'go';
active: boolean;
}
export async function fetchActiveProjects(apiEndpoint: string): Promise<DeveloperProject[]> {
const response = await fetch(apiEndpoint);
if (!response.ok) {
throw new Error(`HTTP error! status: ${response.status}`);
}
const payload: ApiResponse<DeveloperProject> = await response.json();
return payload.data.filter(proj => proj.active);
}Standards, versions, and features supported across the platform.
| Language & Standard | Version / Specification | Features Supported |
|---|---|---|
| ECMAScript | ES2022 / ESNext | Async/await, optional chaining, nullish coalescing, private fields |
| TypeScript | TypeScript 5.x | Strict mode, generics, template literal types, satisfies operator |
| Module System | ESM & CommonJS | import/export and require() module resolution |
| Package Managers | pnpm 9+, npm 10+, yarn 1.22+ | NPM registry integration, lockfile parsing, script execution |
| Testing | Jest, Vitest, Mocha | Assertion diffs, failure navigation, JSON report parsing |
Common questions about writing JavaScript on OnlineAIIDE.