TMA DevKit v2: Local Emulator for Telegram Mini Apps + MCP AI Debugging

A developer released TMA DevKit v2, a local emulator and bridge inspector for Telegram Mini Apps that runs apps in an iframe with full Telegram client emulation, eliminating the need for ngrok, BotFather, and physical devices. The update adds an MCP server for AI-powered debugging, a cryptographically valid initData mock, one-click scenario presets, and a bridge event inspector. The project is open-source under MIT and actively developed.

😤 The Problem That Drives Everyone Crazy Ever tried building a Telegram Mini App? Write your code. Spin up ngrok and pray it doesn't crash . Go to @BotFather, paste the tunnel URL. Grab your phone, open the bot, type console.log — and pray again. Repeat for every theme, platform, and user type you need to test. It's 2015, folks. And there's still no official emulator. "The main difficulty is the inability to run a project as easily as in a browser via localhost — and the absence of a developer console." — Habr, March 2025 💡 Introducing: TMA DevKit A local emulator and bridge inspector for Telegram Mini Apps. Think Redux DevTools, but for window.Telegram.WebApp. In one sentence: paste your Mini App URL into the panel, and it runs inside an iframe with a full emulation of the Telegram client — no phone, no ngrok, no BotFather. ✨ What DevKit v2 Can Do and Why It's Awesome 🧠 MCP Server for AI-Powered Debugging — Brand New Connect any AI assistant Claude, GPT, local models via the Model Context Protocol. Ask questions about your app's state, event flow, or initData validation — and get instant debugging suggestions. 🔧 A Real Mock, Not a Stub Full window.Telegram.WebApp API surface all methods, properties, events . Cryptographically valid initData generation with HMAC-SHA-256 signature using your bot token. Backend validation passes as in production. Compatible with @telegram-apps/sdk v3 out of the box. ⚡ 5 One‑Click Quick Scenarios Scenario Description iOS Premium iPhone user with Premium subscription Android Free Regular Android user New User With referral parameter Group Launch Emulates opening from a group chat Desktop Wide viewport on computer Switch contexts in seconds — no manual input. 📊 Bridge Event Inspector All web app calls displayed in real time. Group by type, filter, pause, export logs as .txt. emit console to fire client → app events theme changed, main button pressed, etc. . ☁️ CloudStorage Editor Visual key‑value editor. No more guessing what's stored or messing with localStorage manually. 💾 Saved Presets Save your current config platform, user, theme, viewport, bot token as a named preset. Switch between them in one click — persists across sessions. 🖥️ Polished Panel UX Resizable panels like VS Code . Zoomable device stage 25%–200% . Mobile notch and desktop traffic lights react to platform selection. Import/export config as JSON. 🧰 Tech Stack Component Technology Frontend React 19, TypeScript, Vite Styling Tailwind CSS, shadcn/ui Mock Script ~90 KB of vanilla JS, zero dependencies Testing 22+ Vitest tests base64url, config, protocol, events License MIT 🎯 What's Next? The project is under active development. Planned: More scenario presets. Enhanced MCP integration with pre‑built prompts. VS Code plugin. 🔗 Links GitHub: github.com/Deus-org/tma-devkit Live Demo if available — add your link or a screenshot. 👋 Call to Action If you've ever built a TMA, I'd really appreciate: Feedback on the README is it clear? . Feature suggestions. Bug reports open an issue on GitHub . ⭐️ Star the repo if you find it useful — it helps a ton Built by a developer who got tired of debugging on a phone. Let's make TMA development better together 🚀