WhatsApp Number Checker – A browser extension to check which phone numbers are active on WhatsApp Web.

The Problem

For marketing teams and individuals who use WhatsApp to connect with their audience, verifying which phone numbers are active on the platform is a tedious and time-consuming task. The manual process of copying and pasting each number from a list into WhatsApp to check for a valid profile is slow, inefficient, and prone to errors. This repetitive work takes away valuable time that could be spent on more important marketing activities.

The Solution

This browser extension streamlines the process of verifying WhatsApp numbers directly within the WhatsApp Web interface. It helps you quickly identify which numbers from a list are active on WhatsApp, saving you hours of manual work. The extension is designed to mimic human-like behavior, with random delays and pauses, to ensure a smooth and reliable checking process. It's not a bulk messaging tool, but a utility to assist in validating your contact lists efficiently.

Key Features

• ✅ Works directly inside the official WhatsApp Web interface.
• 📝 Reads numbers from the last message sent in a chat.
• 🤖 Simulates human-like behavior with random delays and pauses.
• 📊 Provides live logs of the checking process.
• 💾 Exports valid numbers to CSV or JSON files.
• 📋 Allows you to copy the list of valid numbers with a single click.

How It Works

1. Paste Your Numbers: You paste a list of numbers into any WhatsApp chat and send it as a message.
2. Open the Extension: Click on the extension's icon in your browser's toolbar.
3. Start Checking: Click the "Start Checking" button.
4. Automatic Scanning: The extension automatically reads the last message, extracts the numbers, and checks each one.
5. View Results: Valid numbers are displayed in the "Results" table in real-time.
6. Export Your Data: Once the process is complete, you can export the results.

Installation

Since the extension is not yet available on the Chrome Web Store, you need to install it manually using Developer Mode.

1. Download the Code: Download the project files from this repository, preferably as a ZIP file from the "Releases" section.
2. Extract the Files: Unzip the downloaded file into a folder on your computer.
3. Open Extensions Page: Open your browser (Google Chrome, Microsoft Edge, etc.) and navigate to the extensions management page (e.g., chrome://extensions).
4. Enable Developer Mode: Turn on the "Developer mode" toggle, which is usually in the top-right corner.
5. Load the Extension: Click the "Load unpacked" button and select the folder where you extracted the project files.
6. Done! The extension is now installed and ready to use.

How to Use

1. Open WhatsApp Web: Log in to your WhatsApp account at web.whatsapp.com.
2. Prepare Your List: Open any chat (you can even send a message to yourself) and paste the list of numbers you want to check.
3. Send the Message: Send the message containing the numbers.
4. Open the Extension: Click on the extension's icon in your browser's toolbar.
5. Start the Process: Click the "▶️ Start Checking" button.
6. Monitor the Progress: You can watch the progress in the "Logs" section of the extension's popup.
7. Export Your Results: Once the scanning is complete, use the "Export CSV," "Export JSON," or "Copy" buttons to get your list of valid numbers.

Output & Export

The extension provides several ways to access the results:

• CSV: A comma-separated values file, easy to open in Excel or Google Sheets.
• JSON: A structured data file for use in other applications.
• Copy to Clipboard: Quickly copy the results for pasting elsewhere.

Important Notice

• This extension is designed to work with the current version of the WhatsApp Web interface. WhatsApp may update its website, which could temporarily affect the extension's functionality.
• The user is solely responsible for the use of this tool. It is intended to assist in validating contact lists, not for spam or bulk messaging.
• There is no guarantee against your account being restricted by WhatsApp. Use it at your own risk, and avoid using it excessively.

Roadmap

Here are some features planned for the future:

• 🚀 Release on the Chrome Web Store for easy installation.
• ⚙️ Add speed control modes (e.g., slow, normal, fast).
• 📞 Improve handling of different phone number formats.
• 🗂️ Add features for bulk management of results (e.g., deleting selected entries).

Contributing & Feedback

If you find any issues or have suggestions for improvements, please feel free to open an issue in this repository.

License

This project is licensed under the MIT License.