Build Task Reminder App with Telegram

What you're building: Task scheduler that sends automatic Telegram reminders

Tech stack: React + NestJS + PostgreSQL + Telegram Bot

Step 1: Tell Cocoding.ai What to Build

Copy/paste this prompt:

Build a simple web application with React frontend and NestJS backend
that allows users to create tasks with a title and reminder time.

Integrate a Telegram Bot so users can connect their Telegram account
by clicking "Start" on the bot. Store the user's Telegram chat_id in
the backend.

When a task's reminder time is reached, automatically send a reminder
message to the user on Telegram using the Telegram Bot API.

Features:
- Task creation (title + date & time)
- Telegram bot integration
- Scheduled reminder delivery
- Use Postgres database with TypeORM
- Minimal UI focused on functionality

Cocoding.ai creates everything automatically — backend, frontend, database, deployment.

Step 2: Create Telegram Bot

Screenshot placeholder: BotFather conversation in Telegram

2.1 Find BotFather

1. Open Telegram
2. Search for @BotFather
3. Click Start

2.2 Create Your Bot

Send: /newbot

BotFather will ask:

1. Bot name (display name): My Task Reminder
2. Bot username (must end with bot): mytask_reminder_bot

2.3 Copy Your Token

BotFather replies with:

Use this token to access the HTTP API:
1234567890:ABCdefGHIjklMNOpqrsTUVwxyz1234567890

Copy this token — you'll need it next.

Step 3: Add Bot Token to App

Open backend/.env and add your token:

TELEGRAM_BOT_TOKEN=1234567890:ABCdefGHIjklMNOpqrsTUVwxyz1234567890

Save the file — app restarts automatically.

Step 4: Connect Your Telegram

4.1 Open Your App

1. Open the app URL (Cocoding.ai provides this)
2. Click "Connect Telegram"

4.2 Start the Bot

1. Telegram opens your bot
2. Click "Start"
3. You should receive: Connected! You will now receive task reminders here.

Step 5: Create Tasks & Test

1. Enter Task Title
2. Select Date & Time (2 minutes from now for testing)
3. Click "Create Task"

Wait for the reminder time — you'll get a Telegram message!

Troubleshooting

Bot not working?

• Check .env has correct token (no extra spaces)
• App restarted after saving .env
• Check logs for: Telegram bot started

Not getting reminders?

• Verify app shows "Connected" status
• Make sure you clicked "Start" in Telegram bot
• Reminder time must be in the future
• Each reminder only sends once

Connection failed?

• Open bot in Telegram
• Click "Start" again
• Check if you received the connected message

Customize Your Bot (Optional)

Set Description

In Telegram to @BotFather:

/setdescription

Select your bot, send: Get task reminders directly in Telegram

Add Profile Picture

/setuserpic

Select your bot, upload image (512x512 recommended)

Set Commands

/setcommands

Select your bot, send:

start - Connect your account
help - Show help

Security Tips

Never share your bot token publicly

Don't commit `.env` to git

Regenerate token if exposed:

1. /mybots in @BotFather
2. Select your bot
3. API Token → Revoke current token
4. Update .env with new token

Going to Production

Get Your Bot Verified

For large-scale usage:

1. Your bot works immediately for testing
2. For production, consider bot verification through Telegram
3. Monitor rate limits (30 messages/second per bot)

Scale Considerations

• Multiple users: Single bot handles all users
• High volume: Use webhook instead of polling
• Security: Add user authentication to your app

Customize Your App

Tell Cocoding.ai what you want:

• "Send reminders 15 minutes before instead of at task time"
• "Add task categories/tags"
• "Let users complete tasks by replying to Telegram messages"
• "Add recurring tasks"
• "Send daily summary of all tasks"