How to find user mail on button clikc gmail

To find a user's email address on a button click in Gmail, you can use the Gmail API and JavaScript. Here's a step-by-step guide:

Prerequisites:

Create a Google Cloud Platform project and enable the Gmail API.
Create credentials for your project (OAuth client ID).
Install the google-auth-library and google-api-library packages using npm or yarn.
Set up a Gmail account with 2-step verification enabled.

Step 1: Set up the Gmail API

Go to the Google Cloud Console and navigate to the API Library page.
Search for "Gmail API" and click on the result.
Click on the "Enable" button.
Create credentials for your project by clicking on "Create Credentials" > "OAuth client ID".
Choose "Web application" and enter a authorized JavaScript origins (e.g., http://localhost:3000).
Click on "Create" and copy the client ID and client secret.

Step 2: Set up the JavaScript code

Create a new HTML file (e.g., index.html) and add the following code:

<!DOCTYPE html>
<html>
<head>
 <title>Gmail API Example</title>
</head>
<body>
 <button id="find-email-btn">Find Email</button>
 <script src="https://apis.google.com/js/api.js"></script>
 <script>
   // Replace with your client ID and client secret
   var clientId = 'YOUR_CLIENT_ID';
   var clientSecret = 'YOUR_CLIENT_SECRET';
   var redirectUri = 'http://localhost:3000';

   // Set up the Gmail API client
   var googleUser = {};
   var googleAuth = new google.auth.OAuth2(clientId, clientSecret, redirectUri);

   // Set up the button click event handler
   document.getElementById('find-email-btn').addEventListener('click', function() {
     // Get the user's email address
     googleUser = googleAuth.getAuthInstance().getUser();
     var userEmail = googleUser.getEmail();

     // Do something with the user's email address
     console.log('User email:', userEmail);
   });
 </script>
</body>
</html>

Step 3: Run the code

Open the HTML file in a web browser.
Click on the "Find Email" button.
The code will use the Gmail API to authenticate the user and retrieve their email address.
The email address will be logged to the console.

Note: This code uses the google-auth-library and google-api-library packages to authenticate with the Gmail API and retrieve the user's email address. You'll need to install these packages and set up the necessary credentials to use this code.

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How to find user mail on button clikc gmail