diff --git a/src/services/RedocNormalizedOptions.ts b/src/services/RedocNormalizedOptions.ts
index 45e10660..d117a188 100644
--- a/src/services/RedocNormalizedOptions.ts
+++ b/src/services/RedocNormalizedOptions.ts
@@ -222,7 +222,7 @@ export class RedocNormalizedOptions {
       return value.map(lang => lang.toLowerCase()) as CodeSamplesLanguage[];
     }
 
-    return ['json'];
+    return [CODE_SAMPLE_LANGUAGES.JSON];
   }
 
   theme: ResolvedThemeInterface;
diff --git a/src/services/__tests__/OpenAPIParser.test.ts b/src/services/__tests__/OpenAPIParser.test.ts
index 6a69535c..bb63b68f 100644
--- a/src/services/__tests__/OpenAPIParser.test.ts
+++ b/src/services/__tests__/OpenAPIParser.test.ts
@@ -76,26 +76,27 @@ describe('Models', () => {
     test('should deref the properties of a schema', () => {
       const spec = require('./fixtures/properties.json');
       parser = new OpenAPIParser(spec, undefined, opts);
+      const string = 'string';
       const example = {
         id: 0,
         category: {
           id: 0,
-          name: 'string',
+          name: string,
           sub: {
-            prop1: 'string',
+            prop1: string,
           },
         },
         name: 'Guru',
-        photoUrls: ['string'],
+        photoUrls: [string],
         friend: {},
         tags: [
           {
             id: 0,
-            name: 'string',
+            name: string,
           },
         ],
         status: 'available',
-        petType: 'string',
+        petType: string,
       };
 
       expect(
diff --git a/src/services/models/MediaType.ts b/src/services/models/MediaType.ts
index a3556d66..71f7eacc 100644
--- a/src/services/models/MediaType.ts
+++ b/src/services/models/MediaType.ts
@@ -84,7 +84,7 @@ export class MediaTypeModel {
 
           const xmlExamples = this.resolveXmlExample(parser, sample as OpenAPIExample);
           if (xmlExamples[0]) {
-            this.examples[subSchema.title].value = xmlExamples[0]?.exampleValue;
+            this.examples[subSchema.title].value = xmlExamples[0].exampleValue;
           }
         }
       } else {