diff --git a/CHANGELOG.md b/CHANGELOG.md
index e2e0bcd..7c51f12 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [1.17.0] - 2026-10-01
+
+- [#157](https://github.com/itk-dev/devops_itksites/pull/157)
+  Highlight detection result data with MicroLighter
+- [#156](https://github.com/itk-dev/devops_itksites/pull/156)
+  Theme Swagger UI for dark mode
+
 ## [1.16.0] - 2026-09-30
 
 - [#154](https://github.com/itk-dev/devops_itksites/pull/154)
@@ -416,7 +423,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [1.0.0] - 2022-09-15
 
-[Unreleased]: https://github.com/itk-dev/devops_itksites/compare/1.16.0...HEAD
+[Unreleased]: https://github.com/itk-dev/devops_itksites/compare/1.17.0...HEAD
+[1.17.0]: https://github.com/itk-dev/devops_itksites/compare/1.16.0...1.17.0
 [1.16.0]: https://github.com/itk-dev/devops_itksites/compare/1.15.1...1.16.0
 [1.15.1]: https://github.com/itk-dev/devops_itksites/compare/1.15.0...1.15.1
 [1.15.0]: https://github.com/itk-dev/devops_itksites/compare/1.14.0...1.15.0
diff --git a/assets/admin.js b/assets/admin.js
index ec0e849..7bd14d4 100644
--- a/assets/admin.js
+++ b/assets/admin.js
@@ -1,4 +1,6 @@
+import "microlighter/themes/github.css";
 import "./styles/admin.css";
+import "microlighter/micro-lighter-element.js";
 import TomSelect from "tom-select";
 
 const tomSelectHandler = () => {
diff --git a/assets/styles/admin.css b/assets/styles/admin.css
index 475085c..fa08797 100644
--- a/assets/styles/admin.css
+++ b/assets/styles/admin.css
@@ -39,3 +39,13 @@
         background: var(--button-invisible-danger-hover-hover-bg);
     }
 }
+
+/* Code highlighted with <micro-lighter> follows the EasyAdmin light/dark
+   switch rather than the OS setting its theme uses. */
+.ea-light-scheme [data-syntax-theme] {
+    color-scheme: light;
+}
+
+.ea-dark-scheme [data-syntax-theme] {
+    color-scheme: dark;
+}
diff --git a/assets/styles/api-docs.css b/assets/styles/api-docs.css
index a2e9ef5..9255553 100644
--- a/assets/styles/api-docs.css
+++ b/assets/styles/api-docs.css
@@ -111,6 +111,32 @@ header #logo img {
     outline-color: var(--itk-blue);
 }
 
+/* Swagger UI dark mode (html.dark-mode, set from prefers-color-scheme): a dark
+   header and light title instead of the fixed light ones above, and cyan for
+   blue text, as in the Scalar dark theme below. */
+html.dark-mode header:before {
+    background-color: var(--apip-page-background);
+    border-bottom-color: var(--apip-block-border);
+}
+
+html.dark-mode #swagger-ui.api-platform .info .title {
+    color: #fff;
+}
+
+html.dark-mode .swagger-ui .info a,
+html.dark-mode #formats a {
+    color: var(--itk-cyan);
+}
+
+html.dark-mode .swagger-ui .scheme-container .btn.authorize {
+    color: var(--itk-cyan);
+    border-color: var(--itk-cyan);
+}
+
+html.dark-mode .swagger-ui .scheme-container .btn.authorize svg {
+    fill: var(--itk-cyan);
+}
+
 /* Scalar (?ui=scalar). Its themes live in cascade layers, so these unlayered
    rules win without !important. */
 .light-mode,
diff --git a/package.json b/package.json
index cee2ef2..6f243a3 100644
--- a/package.json
+++ b/package.json
@@ -2,6 +2,7 @@
     "type": "module",
     "devDependencies": {
         "@symfony/reprise": "^1.3.0",
+        "microlighter": "^2.2.0",
         "prettier": "^2.8.3",
         "tom-select": "^2.2.2",
         "vite": "^8.3.1"
diff --git a/src/Controller/Admin/DetectionResultCrudController.php b/src/Controller/Admin/DetectionResultCrudController.php
index ebf1c4f..8e47eff 100644
--- a/src/Controller/Admin/DetectionResultCrudController.php
+++ b/src/Controller/Admin/DetectionResultCrudController.php
@@ -16,8 +16,8 @@
 use EasyCorp\Bundle\EasyAdminBundle\Config\Filters;
 use EasyCorp\Bundle\EasyAdminBundle\Controller\AbstractCrudController;
 use EasyCorp\Bundle\EasyAdminBundle\Field\AssociationField;
-use EasyCorp\Bundle\EasyAdminBundle\Field\CodeEditorField;
 use EasyCorp\Bundle\EasyAdminBundle\Field\DateTimeField;
+use EasyCorp\Bundle\EasyAdminBundle\Field\Field;
 
 /**
  * @extends AbstractCrudController<DetectionResult>
@@ -54,7 +54,9 @@ public function configureFields(string $pageName): iterable
         yield DateTimeField::new('createdAt')->hideOnIndex();
         yield DateTimeField::new('modifiedAt')->hideOnIndex();
         yield DateTimeField::new('lastContact');
-        yield CodeEditorField::new('prettyData')->hideOnIndex()->setLabel('Data');
+        yield Field::new('prettyData')->onlyOnDetail()->setLabel('Data')
+            ->setTemplatePath('EasyAdminBundle/Fields/code_highlight.html.twig')
+            ->setCustomOption('language', 'json');
     }
 
     #[\Override]
diff --git a/src/Entity/DetectionResult.php b/src/Entity/DetectionResult.php
index 7bbf0da..1bcdc57 100644
--- a/src/Entity/DetectionResult.php
+++ b/src/Entity/DetectionResult.php
@@ -143,7 +143,7 @@ public function getPrettyData(): string
             return $this->data;
         }
 
-        return json_encode($json, JSON_PRETTY_PRINT);
+        return json_encode($json, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
     }
 
     public function setData(string $data): self
diff --git a/templates/EasyAdminBundle/Fields/code_highlight.html.twig b/templates/EasyAdminBundle/Fields/code_highlight.html.twig
new file mode 100644
index 0000000..e2c9153
--- /dev/null
+++ b/templates/EasyAdminBundle/Fields/code_highlight.html.twig
@@ -0,0 +1,8 @@
+{# @var field \EasyCorp\Bundle\EasyAdminBundle\Dto\FieldDto #}
+{# Highlighted with <micro-lighter> from assets/admin.js; the language is the
+   field's "language" custom option. #}
+<div data-syntax-theme="github">
+    <micro-lighter language="{{ field.customOptions.get('language') }}" controls="copy" line-numbers>
+        <pre><code>{{ field.value }}</code></pre>
+    </micro-lighter>
+</div>
diff --git a/tests/Entity/DetectionResultTest.php b/tests/Entity/DetectionResultTest.php
new file mode 100644
index 0000000..683860a
--- /dev/null
+++ b/tests/Entity/DetectionResultTest.php
@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Tests\Entity;
+
+use App\Entity\DetectionResult;
+use PHPUnit\Framework\TestCase;
+
+class DetectionResultTest extends TestCase
+{
+    public function testPrettyDataIndentsJsonWithoutEscapingSlashesOrUnicode(): void
+    {
+        $result = new DetectionResult()->setData('{"remotes":["https:\/\/github.com\/itk-dev\/sites"],"name":"Ærø"}');
+
+        $this->assertSame(<<<'JSON'
+            {
+                "remotes": [
+                    "https://github.com/itk-dev/sites"
+                ],
+                "name": "Ærø"
+            }
+            JSON, $result->getPrettyData());
+    }
+
+    public function testPrettyDataReturnsDataThatIsNotJsonAsIs(): void
+    {
+        $result = new DetectionResult()->setData('not json');
+
+        $this->assertSame('not json', $result->getPrettyData());
+    }
+}
diff --git a/vite.config.js b/vite.config.js
index 718ed91..cb5d576 100644
--- a/vite.config.js
+++ b/vite.config.js
@@ -14,5 +14,19 @@ export default defineConfig({
       },
     },
   },
-  plugins: [Symfony()],
+  plugins: [
+    Symfony({
+      copy: [
+        // <micro-lighter> loads grammars with import(`./grammars/${language}.js`)
+        // relative to the bundle, which Vite leaves as is, so ship them next to
+        // it under their own names.
+        {
+          from: "node_modules/microlighter/dist/grammars",
+          to: "grammars",
+          pattern: /\.js$/,
+          hash: false,
+        },
+      ],
+    }),
+  ],
 });
diff --git a/yarn.lock b/yarn.lock
index 32b4ce2..684d36b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -234,6 +234,11 @@ lightningcss@^1.33.0:
     lightningcss-win32-arm64-msvc "1.33.0"
     lightningcss-win32-x64-msvc "1.33.0"
 
+microlighter@^2.2.0:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/microlighter/-/microlighter-2.2.0.tgz#c40f99cd420c26bb39bb5797c2e4e90e2f3b73c2"
+  integrity sha512-XFUHmKclX4taKWVpYkqJ/GlfUS27FzQTCph1u3v9OwkmQJGXry3Pk1e7SivLz6xGOCxRVyi3DSrztF3e460jrg==
+
 nanoid@^3.3.18:
   version "3.3.19"
   resolved "https://registry.yarnpkg.com/nanoid/-/nanoid-3.3.19.tgz#336d4aa4bcd4fb24d2cddede7ffeae40bec03f0a"