Online TypeScript Editor

Write, refactor, and download TypeScript source in the browser with completions, find, and format helpers.

Paste a snippet, edit with highlighting, then download—prefer your IDE for large projects and debugging.

Related technologies: Node.js, React, Angular, tsc — see also JavaScript Editor, TSX Editor, JSON Editor.

Focused TypeScript drafting and review when a full project window is more than you need.

Keep TypeScript snippets focused: one function or script path per sample, named clearly, with a short comment for inputs and outputs.

Handle errors you would show in a tutorial—happy-path-only demos hide the hard parts. Avoid hard-coded secrets; use placeholders.

Note the language edition or compiler flags when syntax depends on them (modules, null safety, async). That saves “works on my machine” threads.

Format before sharing. Download and run under your local runtime or test suite rather than trusting a browser buffer as source of truth.

Stable link for this mode: /code-editor/typescript

Open this TypeScript editor, paste or type in the Ace buffer, use find/replace and theme/font controls, then download when ready. Theme choices may stick in local storage on this device—it is not a cloud project.

Editing stays in your browser for normal use (no account required). Do not paste production secrets; save important work to your own repo or encrypted store.

Copy a starter into the editor, rename symbols to match your project, then download. These are teaching/review snippets—not a full app scaffold.

type User = { id: string; roles: readonly string[] };

function hasRole(user: User, role: string): boolean {
  return user.roles.includes(role);
}

export async function getJson(url) {
  const res = await fetch(url, { headers: { Accept: 'application/json' } });
  if (!res.ok) throw new Error(`HTTP ${res.status}`);
  return res.json();
}

const next = {
  ...state,
  items: state.items.map((it) =>
    it.id === id ? { ...it, done: true } : it
  ),
};

// TypeScript
export function normalize(rows) {
  return rows.map((r) => ({ id: String(r.id), ok: Boolean(r.ok) }));
}

async function readConfig(path) {
  const raw = await readFile(path, 'utf8');
  return JSON.parse(raw);
}

Common TypeScript patterns for variables, control flow, and comments. Adjust style to your team’s formatter before you commit.

const port = 3000; let cache: Map<string, User> = new Map();

for (const [k, v] of cache) { }

function pick<T, K extends keyof T>(obj: T, key: K): T[K] { return obj[key]; }

// line  /* block */

const limit = 25;
let cursor = 0;
var legacy = true; // avoid in new code

for (const item of list) {
  work(item);
}

while (cursor < limit) { cursor++; }

Is TypeScript compiled here?

You edit TypeScript with syntax support; compilation happens in your project toolchain.

Does TypeScript run on ConversionTab servers?

No. Download the file and run it in your usual compiler or runtime. Editing here does not execute TypeScript on our servers.

Is my code uploaded while I type?

Normal editing stays in the browser. You do not need an account to draft or download.

Can I change theme and font size?

Yes—use the toolbar above the editor. Preferences can persist in local storage on this device.

When should I use an IDE instead?

Use your IDE for large projects, debugging, secrets, and production builds. This page is for short drafts and reviews.

Nearby editors and helpers for TypeScript work—open one when you need a different highlighter, a validator, or a format tool after you download.

Code Editor · JavaScript Editor · Lua Editor · Perl Editor · PHP Editor · PowerShell Editor · Ruby Editor · Bash Editor · VBScript Editor · Vala Editor · Twig Editor · Turtle Editor