diff --git a/examples/list_verification.yaml b/examples/list_verification.yaml
new file mode 100644
index 00000000..ebada1d6
--- /dev/null
+++ b/examples/list_verification.yaml
@@ -0,0 +1,4 @@
+- name: Verify no duplicates in list
+  type: list
+  itemsPath: $.someList
+  noDuplicates: true
diff --git a/internal/verify/config.go b/internal/verify/config.go
new file mode 100644
index 00000000..9d1a0a31
--- /dev/null
+++ b/internal/verify/config.go
@@ -0,0 +1 @@
+    NoDuplicates bool `yaml:"noDuplicates,omitempty"`
diff --git a/internal/verify/duplicate_check.go b/internal/verify/duplicate_check.go
new file mode 100644
index 00000000..1dcb139f
--- /dev/null
+++ b/internal/verify/duplicate_check.go
@@ -0,0 +1,36 @@
+//
+// Licensed to Apache Software Foundation (ASF) under one or more contributor
+// license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright
+// ownership. Apache Software Foundation (ASF) licenses this file to you under
+// the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package verify
+
+import (
+	"fmt"
+)
+
+// CheckForDuplicates verifies if there are duplicate entries in a list.
+// It returns an error if any duplicates are found.
+func CheckForDuplicates(list []string) error {
+	seen := make(map[string]bool)
+	for _, item := range list {
+		if seen[item] {
+			return fmt.Errorf("duplicate data found: %s", item)
+		}
+		seen[item] = true
+	}
+	return nil
+}
diff --git a/internal/verify/duplicate_check_test.go b/internal/verify/duplicate_check_test.go
new file mode 100644
index 00000000..9bab9f65
--- /dev/null
+++ b/internal/verify/duplicate_check_test.go
@@ -0,0 +1,56 @@
+//
+// Licensed to Apache Software Foundation (ASF) under one or more contributor
+// license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright
+// ownership. Apache Software Foundation (ASF) licenses this file to you under
+// the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package verify
+
+import "testing"
+
+func TestCheckForDuplicates(t *testing.T) {
+	tests := []struct {
+		name    string
+		input   []string
+		wantErr bool
+	}{
+		{"no duplicates", []string{"a", "b", "c"}, false},
+		{"has duplicates", []string{"a", "b", "a"}, true},
+	}
+
+	for _, tt := range tests {
+		err := CheckForDuplicates(tt.input)
+		if (err != nil) != tt.wantErr {
+			t.Errorf("%s: expected error=%v, got %v", tt.name, tt.wantErr, err != nil)
+		}
+	}
+}
+
+func TestRunListVerification_NoDuplicatesFails(t *testing.T) {
+    cfg := ListVerification{NoDuplicates: true}
+    items := []string{"a", "b", "a"}
+    err := (&Verifier{}).RunListVerification(cfg, items)
+    if err == nil {
+        t.Fatalf("expected duplicate check to fail but got nil")
+    }
+}
+
+func TestRunListVerification_NoDuplicatesPassesForUnique(t *testing.T) {
+    cfg := ListVerification{NoDuplicates: true}
+    items := []string{"a", "b", "c"}
+    if err := (&Verifier{}).RunListVerification(cfg, items); err != nil {
+        t.Fatalf("unexpected error: %v", err)
+    }
+}
diff --git a/internal/verify/runner.go b/internal/verify/runner.go
new file mode 100644
index 00000000..f144440d
--- /dev/null
+++ b/internal/verify/runner.go
@@ -0,0 +1,5 @@
+if cfg.NoDuplicates {
+    if err := CheckForDuplicates(items); err != nil {
+        return fmt.Errorf("duplicate check failed: %w", err)
+    }
+}