diff --git a/Server-Side Components/Business Rules/Duplicate CI Detection for ServiceNow/DuplicateCIDetectorScriptInclude.js b/Server-Side Components/Business Rules/Duplicate CI Detection for ServiceNow/DuplicateCIDetectorScriptInclude.js
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+++ b/Server-Side Components/Business Rules/Duplicate CI Detection for ServiceNow/DuplicateCIDetectorScriptInclude.js	
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+var DuplicateCIDetector = Class.create();
+DuplicateCIDetector.prototype = {
+    initialize: function() {},
+
+    findDuplicates: function(ciName, serialNumber, assetTag, sysId) {
+        var duplicates = [];
+        var gr = new GlideRecord('cmdb_ci');
+        gr.addQuery('active', true);
+
+        // Basic name match (case-insensitive)
+        if (ciName) {
+            gr.addQuery('name', 'LIKE', ciName);
+        }
+
+        // Optional matching by serial or asset tag
+        if (serialNumber) {
+            gr.addOrCondition('serial_number', serialNumber);
+        }
+        if (assetTag) {
+            gr.addOrCondition('asset_tag', assetTag);
+        }
+
+        if (sysId)
+            gr.addQuery('sys_id', '!=', sysId); // ignore current record
+
+        gr.query();
+        while (gr.next()) {
+            duplicates.push({
+                name: gr.getValue('name'),
+                serial_number: gr.getValue('serial_number'),
+                asset_tag: gr.getValue('asset_tag'),
+                sys_id: gr.getUniqueValue()
+            });
+        }
+
+        return duplicates;
+    },
+
+    type: 'DuplicateCIDetector'
+};
diff --git a/Server-Side Components/Business Rules/Duplicate CI Detection for ServiceNow/Readme.md b/Server-Side Components/Business Rules/Duplicate CI Detection for ServiceNow/Readme.md
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+Duplicate CIs (Configuration Items) in the CMDB cause data redundancy, reporting errors, and incorrect impact analysis.
+This project automatically detects potential duplicate CIs during record creation or update, using partial string matching and fuzzy comparison on fields like Name, Serial Number, or Asset Tag.
+
+It can warn the user, flag duplicates, or even prevent save depending on configuration.
+
+🚀 Features
+
+Detects duplicate Configuration Items on insert or update
+
+Matches based on configurable fields (e.g., name, serial_number, asset_tag)
+
+Uses partial/fuzzy matching (e.g., "Laptop123" ≈ "Laptop-123")
+
+Optionally prevents saving duplicate entries
+
+Works on both platform UI and Service Portal
+
+Extendable for custom CI classes (cmdb_ci_computer, cmdb_ci_server, etc.)
diff --git a/Server-Side Components/Business Rules/Duplicate CI Detection for ServiceNow/beforeBusinessRule.js b/Server-Side Components/Business Rules/Duplicate CI Detection for ServiceNow/beforeBusinessRule.js
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+++ b/Server-Side Components/Business Rules/Duplicate CI Detection for ServiceNow/beforeBusinessRule.js	
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+(function executeRule(current, previous /*null when async*/) {
+    var detector = new DuplicateCIDetector();
+    var duplicates = detector.findDuplicates(
+        current.name,
+        current.serial_number,
+        current.asset_tag,
+        current.sys_id
+    );
+
+    if (duplicates.length > 0) {
+        var message = 'Potential duplicate CIs detected:\n';
+        for (var i = 0; i < duplicates.length; i++) {
+            message += '- ' + duplicates[i].name + ' (Serial: ' + duplicates[i].serial_number + ')\n';
+        }
+
+        gs.addErrorMessage(message);
+        current.setAbortAction(true); // stop record save
+    }
+})(current, previous);