diff --git a/Gemfile b/Gemfile
index cb1e7c09..71df581b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -35,6 +35,7 @@ end
 group :test do
   gem 'shoulda-matchers'
   gem 'simplecov'
+  gem 'super_diff'
 end
 
 group :development do
diff --git a/Gemfile.lock b/Gemfile.lock
index 35d74a6f..04238fcc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -76,6 +76,7 @@ GEM
       mutex_m
       tzinfo (~> 2.0)
     ast (2.4.2)
+    attr_extras (7.1.0)
     base64 (0.2.0)
     bcrypt (3.1.20)
     bigdecimal (3.1.7)
@@ -163,11 +164,14 @@ GEM
       racc (~> 1.4)
     nokogiri (1.16.3-x86_64-linux)
       racc (~> 1.4)
+    optimist (3.1.0)
     orm_adapter (0.5.0)
     parallel (1.24.0)
     parser (3.3.0.5)
       ast (~> 2.4.1)
       racc
+    patience_diff (1.2.0)
+      optimist (~> 3.0)
     pg (1.5.6)
     pry (0.14.2)
       coderay (~> 1.1)
@@ -300,6 +304,10 @@ GEM
     stimulus-rails (1.3.3)
       railties (>= 6.0.0)
     stringio (3.1.0)
+    super_diff (0.11.0)
+      attr_extras (>= 6.2.4)
+      diff-lcs
+      patience_diff
     tailwindcss-rails (2.3.0-aarch64-linux)
       railties (>= 6.0.0)
     tailwindcss-rails (2.3.0-arm64-darwin)
@@ -357,6 +365,7 @@ DEPENDENCIES
   simplecov
   sprockets-rails
   stimulus-rails
+  super_diff
   tailwindcss-rails
   turbo-rails
   tzinfo-data
diff --git a/spec/serializers/export_serializer_spec.rb b/spec/serializers/export_serializer_spec.rb
new file mode 100644
index 00000000..280c011b
--- /dev/null
+++ b/spec/serializers/export_serializer_spec.rb
@@ -0,0 +1,62 @@
+require 'rails_helper'
+
+RSpec.describe ExportSerializer do
+  describe '#call' do
+    subject(:serializer) { described_class.new(points, user_email).call }
+
+    let(:user_email) { 'ab@cd.com' }
+    let(:points) { create_list(:point, 2) }
+    let(:expected_json) do
+      {
+        user_email => {
+          'dawarich-export' => [
+            {
+              lat: points.first.latitude,
+              lon: points.first.longitude,
+              bs: 'u',
+              batt: points.first.battery,
+              p: points.first.ping,
+              alt: points.first.altitude,
+              acc: points.first.accuracy,
+              vac: points.first.vertical_accuracy,
+              vel: points.first.velocity,
+              conn: 'w',
+              SSID: points.first.ssid,
+              BSSID: points.first.bssid,
+              m: 'p',
+              tid: points.first.tracker_id,
+              tst: points.first.timestamp.to_i,
+              inrids: points.first.inrids,
+              inregions: points.first.in_regions,
+              topic: points.first.topic
+            },
+            {
+              lat: points.second.latitude,
+              lon: points.second.longitude,
+              bs: 'u',
+              batt: points.second.battery,
+              p: points.second.ping,
+              alt: points.second.altitude,
+              acc: points.second.accuracy,
+              vac: points.second.vertical_accuracy,
+              vel: points.second.velocity,
+              conn: 'w',
+              SSID: points.second.ssid,
+              BSSID: points.second.bssid,
+              m: 'p',
+              tid: points.second.tracker_id,
+              tst: points.second.timestamp.to_i,
+              inrids: points.second.inrids,
+              inregions: points.second.in_regions,
+              topic: points.second.topic
+            }
+          ]
+        }
+      }.to_json
+    end
+
+    it 'returns JSON' do
+      expect(serializer).to eq(expected_json)
+    end
+  end
+end