diff --git a/app/models/conversation.rb b/app/models/conversation.rb
index 6e3a91fb2421..7bdb30ede322 100644
--- a/app/models/conversation.rb
+++ b/app/models/conversation.rb
@@ -50,6 +50,8 @@ class Conversation < ApplicationRecord
   validates :account_id, presence: true
   validates :inbox_id, presence: true
   before_validation :validate_additional_attributes
+  validates :additional_attributes, jsonb_attributes_length: true
+  validates :custom_attributes, jsonb_attributes_length: true
 
   enum status: { open: 0, resolved: 1, pending: 2, snoozed: 3 }
 
diff --git a/app/models/jsonb_attributes_length_validator.rb b/app/models/jsonb_attributes_length_validator.rb
new file mode 100644
index 000000000000..2eda4a354f98
--- /dev/null
+++ b/app/models/jsonb_attributes_length_validator.rb
@@ -0,0 +1,21 @@
+class JsonbAttributesLengthValidator < ActiveModel::EachValidator
+  def validate_each(record, attribute, value)
+    return if value.empty?
+
+    @attribute = attribute
+    @record = record
+
+    value.each do |key, attribute_value|
+      validate_keys(key, attribute_value)
+    end
+  end
+
+  def validate_keys(key, attribute_value)
+    case attribute_value.class.name
+    when 'String'
+      @record.errors.add @attribute, "#{key} length should be < 1500" if attribute_value.length > 1500
+    when 'Integer'
+      @record.errors.add @attribute, "#{key} value should be < 9999999999" if attribute_value > 9_999_999_999
+    end
+  end
+end
diff --git a/spec/models/conversation_spec.rb b/spec/models/conversation_spec.rb
index d214b973b346..a1d67f7d09ec 100644
--- a/spec/models/conversation_spec.rb
+++ b/spec/models/conversation_spec.rb
@@ -58,6 +58,37 @@
     end
   end
 
+  describe '.validate jsonb attributes' do
+    let(:account) { create(:account) }
+    let(:agent) { create(:user, email: 'agent1@example.com', account: account) }
+    let(:inbox) { create(:inbox, account: account) }
+    let(:conversation) do
+      create(
+        :conversation,
+        account: account,
+        contact: create(:contact, account: account),
+        inbox: inbox,
+        assignee: nil
+      )
+    end
+
+    it 'validate length of additional_attributes value' do
+      conversation.additional_attributes = { company_name: 'some_company' * 200, contact_number: 19_999_999_999 }
+      conversation.valid?
+      error_messages = conversation.errors.messages
+      expect(error_messages[:additional_attributes][0]).to eq('company_name length should be < 1500')
+      expect(error_messages[:additional_attributes][1]).to eq('contact_number value should be < 9999999999')
+    end
+
+    it 'validate length of custom_attributes value' do
+      conversation.custom_attributes = { company_name: 'some_company' * 200, contact_number: 19_999_999_999 }
+      conversation.valid?
+      error_messages = conversation.errors.messages
+      expect(error_messages[:custom_attributes][0]).to eq('company_name length should be < 1500')
+      expect(error_messages[:custom_attributes][1]).to eq('contact_number value should be < 9999999999')
+    end
+  end
+
   describe '.after_update' do
     let!(:account) { create(:account) }
     let!(:old_assignee) do