@telegram-apps/init-data-node

The package provides utilities to work with the initialization data of Telegram Mini Apps on the server side. To learn more about the initialization data and its usage, please refer to the documentation.

Installation

pnpm

pnpm i @telegram-apps/init-data-node

npm

npm i @telegram-apps/init-data-node

yarn

yarn add @telegram-apps/init-data-node

Parsing

To parse a value as init data, use the parse method.

The method accepts init data presented as a string or URLSearchParams.

import { parse } from '@telegram-apps/init-data-node';

try {
  const initData = parse('...');
  // {
  //   canSendAfter: 10000,
  //   chat: {
  //     id: 1,
  //     type: 'group',
  //     username: 'my-chat',
  //     title: 'chat-title',
  //     photoUrl: 'chat-photo',
  //   },
  //   chatInstance: '888',
  //   chatType: 'sender',
  //   queryId: 'QUERY',
  //   receiver: {
  //     addedToAttachmentMenu: false,
  //     allowsWriteToPm: true,
  //     firstName: 'receiver-first-name',
  //     id: 991,
  //     isBot: false,
  //     isPremium: true,
  //     languageCode: 'ru',
  //     lastName: 'receiver-last-name',
  //     photoUrl: 'receiver-photo',
  //     username: 'receiver-username',
  //   },
  //   startParam: 'debug',
  //   user: {
  //     addedToAttachmentMenu: false,
  //     allowsWriteToPm: false,
  //     firstName: 'user-first-name',
  //     id: 222,
  //     isBot: true,
  //     isPremium: false,
  //     languageCode: 'en',
  //     lastName: 'user-last-name',
  //     photoUrl: 'user-photo',
  //     username: 'user-username',
  //   },
  // }
} catch (e) {
  console.error('Something is wrong', e);
}

Validating

validate

To validate the signature of the initialization data, the validate function is used. It expects the initialization data to be passed in a raw format (search parameters) and throws an error in certain cases.

import { validate } from '@telegram-apps/init-data-node';

const secretToken = '5768337691:AAH5YkoiEuPk8-FZa32hStHTqXiLPtAEhx8';
const initData =
  'query_id=AAHdF6IQAAAAAN0XohDhrOrc' +
  '&user=%7B%22id%22%3A279058397%2C%22first_name%22%3A%22Vladislav%22%2C%22last_name%22%3A%22Kibenko%22%2C%22username%22%3A%22vdkfrost%22%2C%22language_code%22%3A%22ru%22%2C%22is_premium%22%3Atrue%7D' +
  '&auth_date=1662771648' +
  '&hash=c501b71e775f74ce10e377dea85a7ea24ecd640b223ea86dfe453e0eaed2e2b2';

validate(initData, secretToken);

Function will throw an error in one of these cases:

• ERR_AUTH_DATE_INVALID: auth_date is empty or not found
• ERR_HASH_INVALID: hash is empty or not found
• ERR_SIGN_INVALID: signature is invalid
• ERR_EXPIRED: init data expired

Here is the code you could use to check the error type:

import { validate, isErrorOfType } from '@telegram-apps/init-data-node';

try {
  validate('init-data', 'token');
} catch (e) {
  if (isErrorOfType(e, 'ERR_SIGN_INVALID')) {
    console.log('Sign is invalid');
  }
}

By default, the function checks the expiration of the initialization data. The default expiration duration is set to 1 day (86,400 seconds). It is recommended to always check the expiration of the initialization data, as it could be stolen but still remain valid. To disable this feature, pass { expiresIn: 0 } as the third argument.

isValid

Alternatively, to check the init data validity, a developer could use the isValid function. It doesn't throw an error, but returns a boolean value indicating the init data validity.

import { isValid } from '@telegram-apps/init-data-node';

if (isValid('init-data')) {
  console.log('Init data is fine');
}

Signing

There could be some cases when a developer needs to create their own init data. For instance, Telegram does not send this data automatically if you are using something like KeyboardButton or InlineKeyboardButton. Telegram cannot do this because it doesn't know which Telegram Bot token should be used.

To implement such a process, it is required to use the sign method. Here is the complete example:

Signing

import { sign } from '@telegram-apps/init-data-node';

sign(
  {
    canSendAfter: 10000,
    chat: {
      id: 1,
      type: 'group',
      username: 'my-chat',
      title: 'chat-title',
      photoUrl: 'chat-photo',
    },
    chatInstance: '888',
    chatType: 'sender',
    queryId: 'QUERY',
    receiver: {
      addedToAttachmentMenu: false,
      allowsWriteToPm: true,
      firstName: 'receiver-first-name',
      id: 991,
      isBot: false,
      isPremium: true,
      languageCode: 'ru',
      lastName: 'receiver-last-name',
      photoUrl: 'receiver-photo',
      username: 'receiver-username',
    },
    startParam: 'debug',
    user: {
      addedToAttachmentMenu: false,
      allowsWriteToPm: false,
      firstName: 'user-first-name',
      id: 222,
      isBot: true,
      isPremium: false,
      languageCode: 'en',
      lastName: 'user-last-name',
      photoUrl: 'user-photo',
      username: 'user-username',
    },
  },
  '5768337691:AAH5YkoiEuPk8-FZa32hStHTqXiLPtAEhx8',
  new Date(1000),
);

Expected result

'auth_date=1' +
'&can_send_after=10000' +
'&chat=%7B%22id%22%3A1%2C%22type%22%3A%22group%22%2C%22title%22%3A%22chat-title%22%2C%22photo_url%22%3A%22group%22%2C%22username%22%3A%22my-chat%22%7D' +
'&chat_instance=888' +
'&chat_type=sender' +
'&query_id=QUERY' +
'&receiver=%7B%22added_to_attachment_menu%22%3Afalse%2C%22allows_write_to_pm%22%3Atrue%2C%22first_name%22%3A%22receiver-first-name%22%2C%22id%22%3A991%2C%22is_bot%22%3Afalse%2C%22is_premium%22%3Atrue%2C%22language_code%22%3A%22ru%22%2C%22last_name%22%3A%22receiver-last-name%22%2C%22photo_url%22%3A%22receiver-photo%22%2C%22username%22%3A%22receiver-username%22%7D' +
'&start_param=debug' +
'&user=%7B%22added_to_attachment_menu%22%3Afalse%2C%22allows_write_to_pm%22%3Afalse%2C%22first_name%22%3A%22user-first-name%22%2C%22id%22%3A222%2C%22is_bot%22%3Atrue%2C%22is_premium%22%3Afalse%2C%22language_code%22%3A%22en%22%2C%22last_name%22%3A%22user-last-name%22%2C%22photo_url%22%3A%22user-photo%22%2C%22username%22%3A%22user-username%22%7D' +
'&hash=47cfa22e72b887cba90c9cb833c5ea0f599975b6ce7193741844b5c4a4228b40'

This function accepts three arguments:

• Data to sign: It represents a parsed init data object excluding the authDate and hash properties.
• Bot token: This token is received from @BotFather.
• Signing date: This value will be used as the value of the authDate property.

As a result, the function returns signed init data.

Web Crypto API

If this package is used in an environment other than Node.js, a developer can use the web subdirectory, which exports the same methods as described above but returns promises.

import {
  validate,
  sign,
  signData,
  isValid,
} from '@telegram-apps/init-data-node/web';

await validate(...);
await sign(...);
await signData(...);
await isValid(...);

Passing Hashed Token

All package methods allow developers to use a hashed token instead of a raw token.

By "hashed token," we mean a token hashed using the HMAC-SHA-256 algorithm with a key derived from WebAppData, as specified in the validation section of the documentation.

Here are some examples:

import { validate, sign } from '@telegram-apps/init-data-node';

const secretTokenHashed = 'a5c609aa52f63cb5e6d8ceb6e4138726ea82bbc36bb786d64482d445ea38ee5f';
const initData =
  'query_id=AAHdF6IQAAAAAN0XohDhrOrc' +
  '&user=%7B%22id%22%3A279058397%2C%22first_name%22%3A%22Vladislav%22%2C%22last_name%22%3A%22Kibenko%22%2C%22username%22%3A%22vdkfrost%22%2C%22language_code%22%3A%22ru%22%2C%22is_premium%22%3Atrue%7D' +
  '&auth_date=1662771648' +
  '&hash=c501b71e775f74ce10e377dea85a7ea24ecd640b223ea86dfe453e0eaed2e2b2';

// Validating.
validate(initData, secretTokenHashed, { tokenHashed: true });

// Signing.
sign(
  {
    canSendAfter: 10000,
    chat: {
      id: 1,
      type: 'group',
      username: 'my-chat',
      title: 'chat-title',
      photoUrl: 'chat-photo',
    },
    chatInstance: '888',
    chatType: 'sender',
    queryId: 'QUERY',
    receiver: {
      addedToAttachmentMenu: false,
      allowsWriteToPm: true,
      firstName: 'receiver-first-name',
      id: 991,
      isBot: false,
      isPremium: true,
      languageCode: 'ru',
      lastName: 'receiver-last-name',
      photoUrl: 'receiver-photo',
      username: 'receiver-username',
    },
    startParam: 'debug',
    user: {
      addedToAttachmentMenu: false,
      allowsWriteToPm: false,
      firstName: 'user-first-name',
      id: 222,
      isBot: true,
      isPremium: false,
      languageCode: 'en',
      lastName: 'user-last-name',
      photoUrl: 'user-photo',
      username: 'user-username',
    },
  },
  secretTokenHashed,
  new Date(1000),
  { tokenHashed: true }
);

You can use this approach to reduce the number of instances where you directly pass a raw token.