Use case

Once your Express application is deployed, it is important to get notified of any errors in real-time. While there are many advanced solutions for this task already, this utility middleware focuses on being minimalistic, easy setup and of course the cosy Telegram :).

Setup

Write to BotFather, give it a command /newbot, answer the questions, and it will give you a secret token (we call this botToken).
Create a channel, give it a username, and add the bot you have just created to this channel.
Inside of your project directory, run npm install --save express-notify-telegram.
Run npx express-notify-telegram. This CLI will ask you the botToken and channel's username you created in the previous steps and give you the channel's chatId.
Finally, in your application, add the following:

  const express = require('express');
  const telegramLogger = require('express-notify-telegram');
  
  const app = express();
  
  app.use(telegramLogger({
     botToken: '<your botToken from above>', 
     chatId: '<the chatId you got from the CLI>'
  }));
  
  // One of your endpoints
  app.get('/resource', (req, res) => {
    try {
      // Some code that throws error
    } catch(e) {
      // This will fire a notification, as it has an erroneous 500 statusCode.
      res.status(500).json(/* whatever */); 
      
      // If you want a custom error message in the notification, add the following:
      req.errorMessage = 'My custom error message';
    }
  });

Voila, from now you get an instant notification to your Telegram, and immediately fix that bug :).

API

  app.use(expressNotifyTelegram(config, opts));

Configuration (`config`) [required]

`botToken` (required)

The secret token (string) you got from BotFather.

`chatId` (required)

The number you got from the CLI (use the instructions above).

Options (`opts`) [optional]

`exclude` (optional)

An array of statusCodes to ignore. Example: { exclude: [404, 502] } skips all notifications for 404 and 502 statusCodes.

Defaults to [].

Note: This field has the highest priority. Even if you set enable4xx or enable5xx to true, and some values intersect with this array, those statusCodes get ignored.

`enable4xx` (optional)

Boolean value. If true, you will get notifications for 4xx error codes.

Defaults to true.

`sound4xx` (optional)

Boolean value. If true, you will get 4xx notifications with sound.

Defaults to false.

Note: This is ignored if enable4xx is false.

`enable5xx` (optional)

Boolean value. If true, you will get notifications for 5xx error codes.

Defaults to true.

`sound5xx` (optional)

Boolean value. If true, you will get 5xx notifications with sound.

Defaults to true.

Note: This is ignored if enable5xx is false.

`hideSecrets` (optional)

Boolean value. If true, secret fields such as passwords, secrets and tokens are hidden using a mask.

Defaults to true.

`secretWords` (optional)

An array of property names to be hidden with a mask.

Defaults to ['password', 'pass', 'token', 'auth', 'secret', 'passphrase', 'card']

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