@core-ease/telegram-kit

A complete toolkit for building on top of Telegram: Mini Apps SDK (React hooks + a provider), a Bot API client for the server, a zero-dependency .tgs/Lottie sticker player, a standards-compliant QR code encoder, and small utilities for Markdown/HTML formatting, deep links, and keyboards.

It's framework-agnostic where it can be — plain JS, Node, or a <script> tag all work — and gives you React bindings where that actually helps (Mini Apps hooks, the sticker player, the QR component).

Why this exists

Telegram Mini Apps and Bot API projects usually end up gluing together the same handful of things: reading window.Telegram.WebApp, validating initData on the server, building inline keyboards by hand, escaping MarkdownV2, and so on. @core-ease/telegram-kit bundles all of that behind a typed, documented API - with a real, working fallback for every feature when your Mini App is opened outside Telegram - so you don't have to rebuild it for every project.

Installation

npm install @core-ease/telegram-kit

React is an optional peer dependency — you only need it if you use the hooks, the provider, or the sticker/QR components. Everything else (bot client, QR encoding, formatting, links, server-side validation) works in plain Node or the browser with no React involved.

Package structure

The source is organized by what the code does, not by which npm subpath exports it:

src/
  sdk/       The full Mini Apps SDK: a faithful, modular TypeScript port of
             Telegram's official telegram-web-app.js (no CDN fetch, ever).
             Public entry: sdk/index.ts. Everything else lives under
             sdk/_internal/ (transport, kernel, theme, ui, features, sensors)
             and is an implementation detail - see sdk/README.md.
  core/      Telegram WebApp runtime access (getWebApp, haptics, storages,
             dialogs, location, biometrics, ...) - every function here gets
             the WebApp instance directly from ../sdk (never from
             window.Telegram) and has a real browser-native fallback for
             when the Mini App is opened outside Telegram. See
             core/fallback.ts for the fallback implementations and
             core/dev.ts for dev/local-testing mode.
  react/     Hooks and the TelegramProvider for React-based Mini Apps -
             every hook delegates to core/ rather than re-implementing
             its own copy of the same logic
  ui/        QR code generation/rendering and the Lottie/TGS sticker players
  utils/     MarkdownV2/HTML formatting, deep links, inline & reply keyboards
  bot/       The Bot API client, update dispatcher, and long-polling helper
  types/     Shared TypeScript types for the WebApp and the Bot API - the
             WebApp types are thin re-exports of the real ../sdk types
             instead of a hand-maintained parallel copy
  _internal/ Implementation details (QR encoding math, the Lottie rendering
             engine, gzip inflate, HMAC verification, etc.) — not part of the
             public API and can change without notice

None of this affects how you import the package — see the sections below for that. It's just how the codebase itself is laid out, in case you're browsing the source or opening a PR.

Quick start — Mini App (React)

Wrap your app once:

import { TelegramProvider, useTelegram } from '@core-ease/telegram-kit';

function App() {
  return (
    <TelegramProvider options={{ autoExpand: true }}>
      <Home />
    </TelegramProvider>
  );
}

function Home() {
  const { user, colorScheme, inTelegram } = useTelegram();

  if (!inTelegram) return <p>Open this from a Telegram chat.</p>;

  return <p>Hey {user?.first_name}, you're on {colorScheme} mode.</p>;
}

TelegramProvider calls WebApp.ready(), expands the window, reads the current user, and tracks the color scheme for you. options also accepts onReady, onUserReady, loadingComponent, notInTelegramComponent, allowOutsideTelegram, autoDisableVerticalSwipes, and autoEnableClosingConfirmation.

From there, the hooks cover most of the WebApp surface:

import {
  useTelegramMainButton,
  useTelegramBackButton,
  useHapticFeedback,
  useShowConfirm,
  useCloudStorage,
} from '@core-ease/telegram-kit';

function CheckoutButton() {
  const haptic = useHapticFeedback();
  const confirm = useShowConfirm();

  useTelegramMainButton({
    text: 'Confirm order',
    onClick: async () => {
      if (await confirm('Place this order?')) {
        haptic.notification('success');
      }
    },
  });

  return null;
}

There are around 40 hooks in total — main/back/settings buttons, cloud/device/secure storage, biometrics, accelerometer/gyroscope, viewport and safe-area, fullscreen, theme, clipboard, QR scanning, and more. They're all exported from the package root, so your editor's autocomplete is the fastest way to browse them.

Core (no React required)

Everything the hooks are built on is also available directly, for vanilla JS, Vue, or anywhere else:

import { getWebApp, isInTelegram, haptic, cloudStorage, dialog } from '@core-ease/telegram-kit';

if (isInTelegram()) {
  await dialog.showConfirm('Continue?');
  await cloudStorage.setItem('draft', JSON.stringify(formState));
  haptic.impact('medium');
}

This module also has openTelegramLink, openInvoice, shareToStory, requestContact, scanQr, downloadFile, getUserDisplayName, getUserAvatarUrl, and the rest of the WebApp surface as plain functions.

Bot API (server-side)

import { TelegramBot, Dispatcher, TelegramPoller } from '@core-ease/telegram-kit/bot';

const bot = new TelegramBot({ token: process.env.BOT_TOKEN! });

const dispatcher = new Dispatcher()
  .onCommand('start', (msg) => bot.sendMessage({ chat_id: msg.chat.id, text: 'Welcome!' }))
  .onMessage((msg) => bot.sendMessage({ chat_id: msg.chat.id, text: `You said: ${msg.text}` }));

const poller = new TelegramPoller(
  (params) => bot.getUpdates(params),
  dispatcher.toHandler()
);

poller.start();

TelegramBot covers the Bot API methods (sendMessage, sendPhoto, editMessageText, answerCallbackQuery, setWebhook, and so on) with typed params and typed responses, and throws a TelegramApiError (with errorCode and description) when the API rejects a call. If you'd rather run a webhook than long polling, call dispatcher.toHandler()(update) from your HTTP handler instead of using TelegramPoller.

Verifying initData on the server

Never trust initData on the client — always verify it server-side before treating it as an authenticated user:

import { validateInitData } from '@core-ease/telegram-kit/server';

const result = await validateInitData(initDataFromClient, process.env.BOT_TOKEN!, {
  maxAgeSeconds: 3600,
});

if (!result.valid) {
  // result.reason: 'invalid_hash' | 'expired' | 'missing_hash' | 'malformed'
  throw new Error('Invalid Telegram session');
}

// result.user, result.startParam, result.authDate are ready to use

There's also a synchronous validateInitDataSync if you're not in an async context — same options, same result shape.

QR codes

A zero-dependency ISO/IEC 18004 encoder plus a styled React component:

import { QRCode, encodeQRCode, qrCodeToSVG } from '@core-ease/telegram-kit/qr';

// as a component
<QRCode value="https://t.me/your_bot" size={256} dotColor="#111" logo="/logo.png" />

// or just get raw SVG / matrix data, no React needed
const svg = qrCodeToSVG('https://t.me/your_bot', { size: 512, color: '#000' });
const { modules } = encodeQRCode('https://t.me/your_bot', { errorCorrectionLevel: 'M' });

QRCode supports custom dot/corner shapes, a logo with automatic size clamping so it never breaks scannability, rounded corners, and a downloadQRCode(svgRef.current, { format: 'png' | 'svg' }) helper for exporting it.

Animated stickers (TGS / Lottie)

import { TgsPlayer } from '@core-ease/telegram-kit/tgs';

<TgsPlayer src="/stickers/wave.tgs" autoplay loop style={{ width: 128, height: 128 }} />

TgsPlayer validates that the file is actually a Telegram-compliant animated sticker (set strict={false} to skip that check). If you're rendering a plain Lottie JSON animation instead of a .tgs file, use LottiePlayer from @core-ease/telegram-kit/lottie — same props, no TGS validation. Both are also reachable from @core-ease/telegram-kit/animation.

Formatting messages (MarkdownV2 / HTML)

Hand-escaping MarkdownV2 is a common source of bugs (it has more reserved characters than people expect). This builds the string for you instead:

import { md, html } from '@core-ease/telegram-kit/format';

const text = md.text('Hello ', md.bold(user.first_name), '! Your order ', md.code(orderId), ' is ready.');
await bot.sendMessage({ chat_id, text: text.toString(), parse_mode: 'MarkdownV2' });

Both md and html support bold, italic, underline, strikethrough, spoiler, code, pre, link, mentionUser, and customEmoji; html additionally has blockquote and expandableBlockquote. Everything you pass in is escaped automatically unless it's already a formatted fragment, so nesting md.bold(md.italic('x')) works as expected. TELEGRAM_TEXT_LIMITS and truncateText are there for staying under Telegram's length limits (surrogate-pair-safe).

Deep links

import { buildStartLink, buildStartAppLink, parseTelegramLink } from '@core-ease/telegram-kit/links';

buildStartLink({ botUsername: 'your_bot', data: 'ref_42' });
// -> https://t.me/your_bot?start=cmVmXzQy

buildStartAppLink({ botUsername: 'your_bot', appName: 'shop', startParam: 'sku_123' });
// -> https://t.me/your_bot/shop?startapp=sku_123

parseTelegramLink('https://t.me/your_bot/shop?startapp=sku_123');
// -> { type: 'mini-app', username: 'your_bot', appName: 'shop', startParam: 'sku_123' }

start/startapp parameters only allow A-Z a-z 0-9 _ - and 64 characters max — pass data and it gets base64url-encoded for you; pass startParam directly if it's already a valid short slug.

Keyboards

import { InlineKeyboardBuilder, ReplyKeyboardBuilder } from '@core-ease/telegram-kit/keyboards';

const keyboard = new InlineKeyboardBuilder()
  .text('Yes', 'confirm:yes').text('No', 'confirm:no')
  .row()
  .url('Docs', 'https://example.com')
  .build();

await bot.sendMessage({ chat_id, text: 'Confirm?', reply_markup: keyboard });

InlineKeyboardBuilder.columns(buttons, perRow) is a shortcut for grid layouts. removeKeyboard() and forceReply() cover the remaining reply-markup types.

Developing outside Telegram

WebApp doesn't exist outside a Telegram client, which makes local development painful. Even without calling installDevMode(), every @core-ease/telegram-kit function already degrades to a real browser-native equivalent (see core/fallback.ts) - so hooks and core functions work in a regular browser tab out of the box. installDevMode() goes one step further and seeds a fake user/theme/session, so getWebApp().initDataUnsafe.user, the theme, and isInTelegram() all behave like a real launch too:

import { installDevMode } from '@core-ease/telegram-kit/dev';

// Call this before anything else touches getWebApp() - hooks, <TelegramProvider>,
// or any core/index.ts function. It seeds a fake user/theme/session through the
// exact same code path a real Telegram launch uses, so every feature (storage,
// haptics, dialogs, location, ...) keeps working through its browser-native
// fallback instead of hanging or warning.
if (process.env.NODE_ENV === 'development') {
  installDevMode({ user: { id: 1, first_name: 'Dev' } });
}

Don't ship this in production — gate it behind an environment check like above.

Using it without a bundler

There's also a plain browser build that exposes everything under a TelegramKit global. It bundles the full Mini Apps SDK itself, so no external telegram.org script tag is needed:

<script src="https://unpkg.com/@core-ease/telegram-kit/dist/browser.global.js"></script>
<script>
  const { encodeQRCode, buildStartLink, isInTelegram, getWebApp } = TelegramKit;
  console.log(getWebApp()?.platform);
</script>

This build includes core, QR, formatting, links, keyboards, dev mode, and the bundled Mini Apps SDK - not the React-dependent pieces, since there's no React in a plain <script> context.

The bundled Mini Apps SDK

@core-ease/telegram-kit used to be a thin type wrapper around Telegram's own https://telegram.org/js/telegram-web-app.js, which you had to load yourself via a <script> tag. That script is now vendored in full, as a faithful line-for-line behavioral TypeScript port, under @core-ease/telegram-kit/sdk (source: src/sdk/, public entry src/sdk/index.ts, implementation under src/sdk/_internal/).

Practically, this means:

• No CDN dependency, ever. Just import '@core-ease/telegram-kit' (or /core, or /hooks) and the first call to getWebApp() - which every hook and core function makes for you - sets up window.Telegram.WebApp locally. Nothing is fetched over the network, and nothing runs eagerly just from importing the package (SSR-safe).

• core/, react/hooks.ts, and <TelegramProvider> all read the SDK directly - getWebApp() in core/index.ts gets the WebApp instance from ../sdk's bootstrapTelegramWebApp(), never from window.Telegram. Every hook delegates to core/ instead of re-implementing its own copy of the same call.

• Every feature has a real browser fallback. Opened outside Telegram (or in dev mode, or against an older client), storage falls back to localStorage, haptics to navigator.vibrate, location to navigator.geolocation, clipboard to navigator.clipboard, file downloads to a plain <a download>, dialogs to window.alert/confirm/prompt, fullscreen/orientation to the standard Fullscreen/Screen Orientation APIs, and sharing to the Web Share API - see src/core/fallback.ts. Calls that have no meaningful browser equivalent (biometrics, emoji status, Telegram-account actions, ...) resolve predictably instead of hanging or rejecting with a console warning.

• Every native event, version gate, and validation rule from the official script is preserved exactly in the SDK layer itself - see src/sdk/README.md for the module-by-module breakdown and fidelity notes.

• Advanced use: if you want the typed SDK classes directly instead of going through core/, import from @core-ease/telegram-kit/sdk:

  import { bootstrapTelegramWebApp } from '@core-ease/telegram-kit/sdk';
  
  const { webApp } = bootstrapTelegramWebApp();
  webApp.MainButton.setText('Continue').show();

TypeScript

Everything is written in TypeScript and ships its own .d.ts files — no @types package needed. The full Bot API type surface (Message, Update, InlineKeyboardMarkup, every SendXParams type, etc.) is exported from @core-ease/telegram-kit/bot and @core-ease/telegram-kit directly.

License

MIT