diff --git a/src/main/java/uno/fastcampus/testdata/service/exporter/JsonFileExporter.java b/src/main/java/uno/fastcampus/testdata/service/exporter/JsonFileExporter.java
index bcef0bf..d28d62f 100644
--- a/src/main/java/uno/fastcampus/testdata/service/exporter/JsonFileExporter.java
+++ b/src/main/java/uno/fastcampus/testdata/service/exporter/JsonFileExporter.java
@@ -11,7 +11,6 @@
 import uno.fastcampus.testdata.service.generator.MockDataGeneratorContext;
 
 import java.util.*;
-import java.util.stream.Collectors;
 import java.util.stream.IntStream;
 
 @Slf4j
@@ -37,12 +36,22 @@ public String export(TableSchemaDto dto, Integer rowCount) {
                 dto.schemaFields().stream()
                         .sorted(Comparator.comparing(SchemaFieldDto::fieldOrder))
                         .forEach(field -> {
-                            map.put(field.fieldName(), mockDataGeneratorContext.generate(
+                            String generatedValue = mockDataGeneratorContext.generate(
                                     field.mockDataType(),
                                     field.blankPercent(),
                                     field.typeOptionJson(),
                                     field.forceValue()
-                            ));
+                            );
+                            if (generatedValue == null) {
+                                map.put(field.fieldName(), null);
+                            } else {
+                                var jsonValue = switch (field.mockDataType().jsonType()) {
+                                    case NUMBER -> Long.valueOf(generatedValue);
+                                    case BOOLEAN -> Boolean.valueOf(generatedValue);
+                                    default -> generatedValue;
+                                };
+                                map.put(field.fieldName(), jsonValue);
+                            }
                         });
                 list.add(map);
             });
diff --git a/src/test/java/uno/fastcampus/testdata/service/exporter/JsonFileExporterTest.java b/src/test/java/uno/fastcampus/testdata/service/exporter/JsonFileExporterTest.java
index c8e248d..6b6548d 100644
--- a/src/test/java/uno/fastcampus/testdata/service/exporter/JsonFileExporterTest.java
+++ b/src/test/java/uno/fastcampus/testdata/service/exporter/JsonFileExporterTest.java
@@ -57,7 +57,11 @@ void givenSchemaAndRowCount_whenExporting_thenReturnsJsonFormattedString() throw
                 )
         );
         int rowCount = 10;
-        given(mockDataGeneratorContext.generate(any(), any(), any(), any())).willReturn("test-value");
+        given(mockDataGeneratorContext.generate(eq(MockDataType.ROW_NUMBER), any(), any(), any())).willReturn("1");
+        given(mockDataGeneratorContext.generate(eq(MockDataType.NAME), any(), any(), any())).willReturn("test-name");
+        given(mockDataGeneratorContext.generate(eq(MockDataType.DATETIME), any(), any(), any())).willReturn("2024-01-02T03:04:05");
+        given(mockDataGeneratorContext.generate(eq(MockDataType.NUMBER), any(), any(), any())).willReturn(null);
+        given(mockDataGeneratorContext.generate(eq(MockDataType.CAR), any(), any(), any())).willReturn("test-횬다이");
 
         // When
         String result = sut.export(dto, rowCount);
@@ -68,7 +72,7 @@ void givenSchemaAndRowCount_whenExporting_thenReturnsJsonFormattedString() throw
                 .startsWith("[")
                 .endsWith("]")
                 .contains("""
-                        {"id":"test-value","name":"test-value","age":"test-value","car":"test-value","created_at":"test-value"}"""
+                        {"id":1,"name":"test-name","age":null,"car":"test-횬다이","created_at":"2024-01-02T03:04:05"}"""
                 );
         then(mockDataGeneratorContext).should(times(rowCount * dto.schemaFields().size())).generate(any(), any(), any(), any());
         then(mapper).should().writeValueAsString(any());
@@ -78,7 +82,7 @@ void givenSchemaAndRowCount_whenExporting_thenReturnsJsonFormattedString() throw
     @Test
     void givenSchemaAndRowCount_whenFailingToJsonFormatting_thenReturnsEmptyString() throws Exception {
         // Given
-        TableSchemaDto dto = TableSchemaDto.of("test_schema", "uno", null, Set.of(SchemaFieldDto.of("id", MockDataType.ROW_NUMBER, 1, 0, null, null)));
+        TableSchemaDto dto = TableSchemaDto.of("test_schema", "uno", null, Set.of(SchemaFieldDto.of("name", MockDataType.NAME, 1, 0, null, null)));
         int rowCount = 10;
         given(mockDataGeneratorContext.generate(any(), any(), any(), any())).willReturn("test-value");
         willThrow(JsonProcessingException.class).given(mapper).writeValueAsString(any());