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+# ServiceNow Email Validation - onSubmit Script
+
+## Overview
+Email validation client script for ServiceNow catalog items that checks the email format when the user submits a form. This ensures that only valid email addresses are submitted and helps maintain data accuracy.
+
+## Features
+- Validates email during form submission
+- Displays clear error messages near the field
+- User-friendly feedback with examples
+- Lightweight and client-side — no server calls required
+
+## Implementation
+1. Navigate to **Service Catalog > Catalog Client Scripts**
+2. Click **New** to create a new script
+3. Select your **Catalog Item**
+4. Set **Type** to **onSubmit**
+5. Set **Variable name** to your email field variable
+6. Set UI Type to All
+7. Replace `email_field_name` with actual variable name in script
+8. Paste the script code
+9. Check **Active** checkbox
+10. Save
+
+## Validation Rules
+- Required format: `user@domain.com`
+- Accepts: letters, numbers, dots (.), underscores (_), hyphens (-)
+- Minimum 2-character top-level domain
+
+## User Experience
+- **Invalid Input**: Red error message displayed below field
+- **Valid Input**: Form submission proceeds normally
+- **Empty Field**: No validation performed
+- **While Loading**: No validation triggered
+
+## Benefits
+- Prevents submission of incorrect email formats
+- Provides errors(if any) before form submission
+- Improves data quality
+- Enhances overall user experience
diff --git a/Client-Side Components/Catalog Client Script/Email Validataion on Submission/email_validation_onSubmit.js b/Client-Side Components/Catalog Client Script/Email Validataion on Submission/email_validation_onSubmit.js
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+function onSubmit() {
+    // Get the email field value
+    var email = g_form.getValue('email_field_name'); // Replace 'email_field_name' with your actual field name
+    
+    // Check if email field has a value
+    if (email) {
+        // Regular expression for email validation
+        var emailPattern = /^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/;
+        
+        // Test the email against the pattern
+        if (!emailPattern.test(email)) {
+            g_form.addErrorMessage('Please enter a valid email address');
+            g_form.showFieldMsg('email_field_name', 'Invalid email format. Example: user@example.com', 'error');
+            return false; // Prevent form submission
+        }
+    }
+    
+    return true; // Allow form submission
+}
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