diff --git a/.review_apps/ecs_task_definition.tf b/.review_apps/ecs_task_definition.tf
index 75ba57cf1..b019cea45 100644
--- a/.review_apps/ecs_task_definition.tf
+++ b/.review_apps/ecs_task_definition.tf
@@ -45,7 +45,8 @@ locals {
     { name = "SETTINGS__AUTH_PROVIDER", value = "developer" },
     { name = "SETTINGS__FORMS_ENV", value = "review" },
     { name = "SETTINGS__FORMS_RUNNER__URL", value = "https://${local.runner_review_app_hostname}" },
-    { name = "ALLOWED_HOST_PATTERNS", value = "localhost:3000" }
+    { name = "ALLOWED_HOST_PATTERNS", value = "localhost:3000" },
+    { name = "SETTINGS__FEATURES__JSON_SUBMISSION_ENABLED", value = "true" }
   ]
 }
 
diff --git a/app/mailers/aws_ses_form_submission_mailer.rb b/app/mailers/aws_ses_form_submission_mailer.rb
index 7ea5b2909..4d5f2c123 100644
--- a/app/mailers/aws_ses_form_submission_mailer.rb
+++ b/app/mailers/aws_ses_form_submission_mailer.rb
@@ -3,12 +3,13 @@ class AwsSesFormSubmissionMailer < ApplicationMailer
           reply_to: Settings.ses_submission_email.reply_to_email_address,
           delivery_method: Rails.configuration.x.aws_ses_form_submission_mailer["delivery_method"]
 
-  def submission_email(answer_content_html:, answer_content_plain_text:, submission:, files:, csv_filename: nil)
+  def submission_email(answer_content_html:, answer_content_plain_text:, submission:, files:, csv_filename: nil, json_filename: nil)
     @answer_content_html = answer_content_html
     @answer_content_plain_text = answer_content_plain_text
     @submission = submission
     @subject = email_subject
     @csv_filename = csv_filename
+    @json_filename = json_filename
 
     files.each do |name, file|
       attachments[name] = {
diff --git a/app/services/aws_ses_submission_service.rb b/app/services/aws_ses_submission_service.rb
index 88d093816..7868d0db9 100644
--- a/app/services/aws_ses_submission_service.rb
+++ b/app/services/aws_ses_submission_service.rb
@@ -39,7 +39,8 @@ def deliver_submission_email
                                                        answer_content_plain_text:,
                                                        submission: @submission,
                                                        files:,
-                                                       csv_filename:).deliver_now
+                                                       csv_filename:,
+                                                       json_filename:).deliver_now
 
     CurrentJobLoggingAttributes.mail_message_id = mail.message_id
     mail.message_id
diff --git a/app/views/aws_ses_form_submission_mailer/submission_email.html.erb b/app/views/aws_ses_form_submission_mailer/submission_email.html.erb
index a24ea3aa6..96575b15d 100644
--- a/app/views/aws_ses_form_submission_mailer/submission_email.html.erb
+++ b/app/views/aws_ses_form_submission_mailer/submission_email.html.erb
@@ -31,6 +31,10 @@
   <p><%= I18n.t("mailer.submission.csv_file", filename: @csv_filename) %></p>
 <% end %>
 
+<% if @json_filename.present? %>
+  <p><%= I18n.t("mailer.submission.json_file", filename: @json_filename) %></p>
+<% end %>
+
 <%= @answer_content_html.html_safe %>
 
 <hr style="border: 0; height: 1px; background: #B1B4B6; margin: 30px 0 30px 0;">
diff --git a/app/views/aws_ses_form_submission_mailer/submission_email.text.erb b/app/views/aws_ses_form_submission_mailer/submission_email.text.erb
index 9607322b0..9f83d119a 100644
--- a/app/views/aws_ses_form_submission_mailer/submission_email.text.erb
+++ b/app/views/aws_ses_form_submission_mailer/submission_email.text.erb
@@ -21,6 +21,10 @@
   <%= I18n.t("mailer.submission.csv_file", filename: @csv_filename) %>
 <% end %>
 
+<% if @json_filename.present? %>
+  <%= I18n.t("mailer.submission.json_file", filename: @json_filename) %>
+<% end %>
+
 <%= @answer_content_plain_text %>
 
 ---
diff --git a/config/locales/cy.yml b/config/locales/cy.yml
index 9f2fd2764..107b3f4e4 100644
--- a/config/locales/cy.yml
+++ b/config/locales/cy.yml
@@ -433,6 +433,7 @@ cy:
       csv_file: 'A CSV file of these answers is attached to this email in a file named: %{filename}'
       file_attached: "%{filename} (attached to this email)"
       from: GOV.UK Forms <%{email_address}>
+      json_file: 'A JSON file of these answers is attached to this email in a file named: %{filename}'
       payment: You can check that a payment has been made by using this reference number to search transactions within GOV.​UK Pay.
       preview: This is a test submission from a preview of this form.
       question_skipped: This question was skipped
diff --git a/config/locales/en.yml b/config/locales/en.yml
index c00b9453c..ee3605b56 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -433,6 +433,7 @@ en:
       csv_file: 'A CSV file of these answers is attached to this email in a file named: %{filename}'
       file_attached: "%{filename} (attached to this email)"
       from: GOV.UK Forms <%{email_address}>
+      json_file: 'A JSON file of these answers is attached to this email in a file named: %{filename}'
       payment: You can check that a payment has been made by using this reference number to search transactions within GOV.​UK Pay.
       preview: This is a test submission from a preview of this form.
       question_skipped: This question was skipped
diff --git a/spec/mailers/README.md b/spec/mailers/README.md
new file mode 100644
index 000000000..31a1a95e5
--- /dev/null
+++ b/spec/mailers/README.md
@@ -0,0 +1,3 @@
+# Previewing emails
+
+To preview emails listed in `aws_ses_form_submission_mailer_preview.rb` locally, use the route `/rails/mailers` while the rails server is running.
\ No newline at end of file
diff --git a/spec/mailers/aws_ses_form_submission_mailer_preview.rb b/spec/mailers/aws_ses_form_submission_mailer_preview.rb
index 0843060ef..3d7961712 100644
--- a/spec/mailers/aws_ses_form_submission_mailer_preview.rb
+++ b/spec/mailers/aws_ses_form_submission_mailer_preview.rb
@@ -37,4 +37,25 @@ def submission_email_with_csv
                                                 files: {},
                                                 csv_filename: "my_answers.csv")
   end
+
+  def submission_email_with_json
+    form_document = build(:v2_form_document, submission_email: "testing@gov.uk", payment_url: "https://www.gov.uk/payments/your-payment-link")
+    submission = build(:submission, form_document:, is_preview: false)
+    AwsSesFormSubmissionMailer.submission_email(answer_content_html: "<h3>What's your email address?</h3><p>forms@example.gov.uk</p>",
+                                                answer_content_plain_text: "What's your email address?\n\nforms@example.gov.uk",
+                                                submission:,
+                                                files: {},
+                                                json_filename: "my_answers.json")
+  end
+
+  def submission_email_with_csv_and_json
+    form_document = build(:v2_form_document, submission_email: "testing@gov.uk", payment_url: "https://www.gov.uk/payments/your-payment-link")
+    submission = build(:submission, form_document:, is_preview: false)
+    AwsSesFormSubmissionMailer.submission_email(answer_content_html: "<h3>What's your email address?</h3><p>forms@example.gov.uk</p>",
+                                                answer_content_plain_text: "What's your email address?\n\nforms@example.gov.uk",
+                                                submission:,
+                                                files: {},
+                                                csv_filename: "my_answers.csv",
+                                                json_filename: "my_answers.json")
+  end
 end
diff --git a/spec/mailers/aws_ses_form_submission_mailer_spec.rb b/spec/mailers/aws_ses_form_submission_mailer_spec.rb
index b1dc4acaf..8ede0b7c3 100644
--- a/spec/mailers/aws_ses_form_submission_mailer_spec.rb
+++ b/spec/mailers/aws_ses_form_submission_mailer_spec.rb
@@ -1,7 +1,7 @@
 require "rails_helper"
 
 describe AwsSesFormSubmissionMailer, type: :mailer do
-  subject(:mail) { described_class.submission_email(answer_content_html:, answer_content_plain_text:, submission:, files:, csv_filename:) }
+  subject(:mail) { described_class.submission_email(answer_content_html:, answer_content_plain_text:, submission:, files:, csv_filename:, json_filename:) }
 
   let(:submission) do
     build(:submission, form_document: form_document, created_at: submission_timestamp,
@@ -17,6 +17,7 @@
   let(:submission_reference) { Faker::Alphanumeric.alphanumeric(number: 8).upcase }
   let(:payment_url) { nil }
   let(:csv_filename) { nil }
+  let(:json_filename) { nil }
   let(:submission_timestamp) { Time.utc(2022, 12, 14, 13, 0o0, 0o0) }
 
   context "when form filler submits a completed form" do
@@ -256,6 +257,26 @@
           expect(part.body).not_to have_text(I18n.t("mailer.submission.csv_file", filename: csv_filename))
         end
       end
+
+      context "when the json file of answers is attached" do
+        let(:json_filename) { "my_answers.json" }
+
+        describe "the html part" do
+          let(:part) { mail.html_part }
+
+          it "includes text about the JSON filename" do
+            expect(part.body).to have_css("p", text: I18n.t("mailer.submission.json_file", filename: json_filename))
+          end
+        end
+
+        describe "the plaintext part" do
+          let(:part) { mail.text_part }
+
+          it "includes text about the JSON filename" do
+            expect(part.body).to have_text(I18n.t("mailer.submission.json_file", filename: json_filename))
+          end
+        end
+      end
     end
   end
 
diff --git a/spec/services/aws_ses_submission_service_spec.rb b/spec/services/aws_ses_submission_service_spec.rb
index 5af3daf87..20eb8af5d 100644
--- a/spec/services/aws_ses_submission_service_spec.rb
+++ b/spec/services/aws_ses_submission_service_spec.rb
@@ -67,6 +67,7 @@
             submission:,
             files: {},
             csv_filename: nil,
+            json_filename: nil,
           ).once
         end
       end
@@ -100,6 +101,7 @@
           submission:,
           files: { question.email_filename => file_content },
           csv_filename: nil,
+          json_filename: nil,
         ).once
       end
 
@@ -165,6 +167,7 @@
           submission: submission,
           files: { "govuk_forms_a_great_form_#{submission_reference}.csv" => expected_csv_content },
           csv_filename: "govuk_forms_a_great_form_#{submission_reference}.csv",
+          json_filename: nil,
         ).once
       end
 
@@ -196,6 +199,7 @@
                 question.email_filename => file_content,
               },
               csv_filename: "govuk_forms_a_great_form_#{submission_reference}.csv",
+              json_filename: nil,
             ).once
           end
         end
@@ -214,6 +218,7 @@
                 JSON.parse(json)["form_name"] == "A great form"
               end,
             },
+            json_filename: "govuk_forms_a_great_form_#{submission_reference}.json",
           ),
         ).and_call_original
 
@@ -254,6 +259,7 @@
             submission:,
             files: {},
             csv_filename: nil,
+            json_filename: nil,
           ).once
         end
       end