API and libraries for working with Telegram

Telegram offers two main APIs for developers: the Bot API for building bots and the Telegram API (TDLib/MTProto) for building full-featured client applications. Choosing the right API and library depends on your project goals — whether you need a simple notification bot, a channel management tool, or a complete Telegram client. Below is a comprehensive guide to the available options across popular programming languages.

Understanding Telegram's Two APIs

Bot API

The Bot API is the most accessible entry point for Telegram development. It uses a simple HTTP-based interface where you send requests to https://api.telegram.org/bot<TOKEN>/methodName. Key characteristics:

  • Easy to use — standard REST calls with JSON responses
  • No authentication complexity — just a token from @BotFather
  • Rate limits — roughly 30 messages per second to different chats, 1 message per second to the same chat
  • Limited scope — bots cannot access message history before they joined, cannot initiate conversations with users, and cannot perform some admin-level actions

The Bot API is ideal for webhooks, automated posting, moderation bots, and integration services like those used by tgchannel.space to export channel content to the web.

Telegram API (MTProto / TDLib)

The Telegram API is the full protocol used by official Telegram apps. It provides complete access to all Telegram features, including:

  • Reading full message history
  • Managing channels and groups as a user
  • Accessing user contacts and dialogs
  • Downloading any media file without bot restrictions
  • Real-time updates via persistent connections

Working with MTProto directly is complex. Telegram provides TDLib (Telegram Database Library) as a recommended wrapper that handles encryption, connection management, and local data caching.

Important: Using the Telegram API requires registering your application at my.telegram.org to obtain an api_id and api_hash. Misuse can lead to account restrictions.

Popular Libraries by Language

Python

Python has the richest ecosystem for Telegram development.

Bot API libraries:

  • python-telegram-bot (v20+) — the most popular choice with async support, job queues, and extensive documentation. Install with pip install python-telegram-bot.
  • aiogram (v3) — a modern async-first framework built on aiohttp. Excellent for high-performance bots handling thousands of updates. Install with pip install aiogram.
  • Telebot (pyTelegramBotAPI) — simpler synchronous API, good for beginners. Install with pip install pyTelegramBotAPI.

Telegram API (MTProto) libraries:

  • Telethon — the go-to async library for user-level Telegram API access. Supports logging in as a user, scraping channels, managing groups. Install with pip install telethon.
  • Pyrogram — another async MTProto library with a clean, modern API. Install with pip install pyrogram.
# Example: Simple bot with python-telegram-bot
from telegram import Update
from telegram.ext import ApplicationBuilder, CommandHandler, ContextTypes

async def start(update: Update, context: ContextTypes.DEFAULT_TYPE):
    await update.message.reply_text("Hello! I'm your channel assistant.")

app = ApplicationBuilder().token("YOUR_BOT_TOKEN").build()
app.add_handler(CommandHandler("start", start))
app.run_polling()

JavaScript / TypeScript

  • grammY — modern, TypeScript-first Bot API framework with plugin ecosystem, middleware support, and excellent docs. Install with npm install grammy.
  • Telegraf — mature Node.js framework for the Bot API with scene management and session support. Install with npm install telegraf.
  • telegram-bot-api (node-telegram-bot-api) — lightweight wrapper, minimal abstraction. Install with npm install node-telegram-bot-api.
  • GramJS — MTProto implementation for Node.js/browser, useful for user-level API access.

Ruby

  • telegram-bot-ruby — the standard Bot API gem used in many Rails projects including tgchannel.space. Install with gem install telegram-bot-ruby. Provides a clean interface for sending messages, handling webhooks, and managing inline keyboards.
  • tdlib-ruby — TDLib bindings for Ruby, enabling full Telegram API access from Ruby applications.

Go

  • telebot (gopkg.in/telebot.v3) — feature-rich Bot API library with middleware, inline mode, and payments support.
  • gotd/td — a complete MTProto implementation in Go, auto-generated from Telegram's TL schema for accuracy.

PHP

  • Nutgram — modern PHP Bot API framework with Laravel integration, hydration, and middleware.
  • php-telegram-bot (longman) — established library with MySQL storage support and admin commands built in.
  • MadelineProto — full MTProto implementation in PHP, supports both user and bot accounts.

Java / Kotlin

  • TelegramBots — the standard Java Bot API library, supports both polling and webhooks.
  • kotlin-telegram-bot — Kotlin-idiomatic wrapper with DSL-style configuration.
  • TDLib — Telegram's official library has Java bindings via JNI.

C# / .NET

  • Telegram.Bot — the official .NET Bot API library, well-maintained with async support.
  • TDLib — official bindings available for .NET through the TDLib project.

Choosing the Right Library

Use Case Recommended Approach Simple notification bot Bot API + any lightweight wrapper Channel management bot Bot API + webhook framework (grammY, aiogram) Export channel content to web Bot API for webhooks + MTProto for history sync Full message history access TDLib or MTProto library (Telethon, Pyrogram) Analytics and scraping MTProto library with proper rate limiting Inline bots and payments Bot API with a full-featured framework

For most channel-related projects — posting, moderation, content export — the Bot API is sufficient. You only need MTProto/TDLib when you require user-level access like reading full history or managing channels beyond bot permissions.

Setting Up a Bot for Channel Integration

Step 1: Create a Bot via @BotFather

Open Telegram, search for @BotFather, and send /newbot. Follow the prompts to name your bot and receive a token like 7123456789:AAHfG2x....

Step 2: Add the Bot to Your Channel

Go to your channel settings → Administrators → Add Administrator → search for your bot. Grant it permissions to Post Messages and Edit Messages at minimum.

Step 3: Set Up a Webhook

Configure your server to receive updates:

curl -X POST "https://api.telegram.org/bot<TOKEN>/setWebhook" \
  -H "Content-Type: application/json" \
  -d '{"url": "https://yourdomain.com/telegram/webhook"}'

Step 4: Process Incoming Updates

Your webhook endpoint receives JSON payloads with new messages, edits, and channel posts. Parse the channel_post field for channel content.

Working with Rate Limits and Restrictions

Telegram enforces rate limits that vary by method:

  • Sending messages: ~30 per second across different chats
  • Bulk notifications: ~25-30 messages per second with sendMessage
  • File uploads: 50 MB max via Bot API, 2 GB via Telegram API
  • getUpdates polling: no more than one concurrent request
  • Inline query results: max 50 results per query

When building tools that sync or export channel data, implement exponential backoff and respect HTTP 429 (Too Many Requests) responses. The retry_after field in the error response tells you exactly how long to wait.

Tips & Best Practices

  • Use webhooks in production instead of long polling. Webhooks are more efficient, reduce latency, and scale better behind load balancers.
  • Store the update_id to avoid processing duplicate messages after restarts. Each update has a unique incrementing ID.
  • Encrypt your bot token at rest. Treat it like a password — anyone with your token has full control of your bot. In Rails projects, use encrypts :bot_token on the model.
  • Use parse_mode: "HTML" for rich formatting in messages. It supports <b>, <i>, <code>, <a href>, and <pre> tags with fewer escaping issues than MarkdownV2.
  • Implement idempotent message processing. Telegram may deliver the same webhook update more than once. Use telegram_message_id as a deduplication key.
  • Leverage media_group_id when handling albums. Telegram sends each photo/video in a group as a separate update — group them by this field before processing.

Common Mistakes

Mistake 1: Hardcoding the bot token in source code
Why it's wrong: Tokens pushed to a public repository can be harvested within minutes by automated scanners. Your bot can then be hijacked to send spam.
How to avoid: Use environment variables or encrypted credentials (Rails.application.credentials, .env files, or secrets managers like AWS Secrets Manager).

Mistake 2: Ignoring media_group_id when processing channel posts
Why it's wrong: A photo album of 5 images arrives as 5 separate updates. Without grouping, you create 5 separate posts instead of one.
How to avoid: Buffer incoming updates for a short window (1-2 seconds), group by media_group_id, then process the group as a single post.

Mistake 3: Using MTProto when the Bot API is sufficient
Why it's wrong: MTProto requires user authentication (phone number, 2FA), session management, and carries a higher risk of account restrictions. It's significantly more complex to maintain.
How to avoid: Start with the Bot API. Only switch to MTProto when you need specific features like reading message history from before the bot was added.

Mistake 4: Not handling Telegram API errors gracefully
Why it's wrong: Temporary errors (network issues, rate limits, server maintenance) can crash your application or cause data loss.
How to avoid: Implement retry logic with exponential backoff. Log all API errors with context (method called, parameters, response code) for debugging.

Frequently Asked Questions

Can I use the Bot API to read old messages from a channel?
No. Bots only receive messages sent after they are added to a channel. To access historical messages, you need the Telegram API (MTProto/TDLib) with a user account that has access to the channel.

Is it free to use the Telegram API?
Yes, both the Bot API and the Telegram API are free with no usage fees. However, you are responsible for your own server hosting costs, and you must comply with Telegram's Terms of Service and API usage policies.

How many bots can I create?
Each Telegram account can create up to 20 bots via @BotFather. If you need more, you can use a different account, though this is rarely necessary since one bot can serve multiple channels.

Can I use multiple programming languages with the same bot?
Yes. The Bot API is language-agnostic — it's just HTTP requests. You can have a Python service handling webhooks and a Ruby service sending scheduled posts, both using the same bot token (though concurrent getUpdates polling is not allowed).

What happens if my webhook server goes down?
Telegram will retry delivering updates with decreasing frequency for up to 24 hours. After that, undelivered updates are dropped. To recover missed messages, you can temporarily switch to getUpdates polling to fetch any queued updates, then re-enable your webhook.