diff --git a/internal/generators/nestjs/nestjs.go b/internal/generators/nestjs/nestjs.go
index 74b3227..9ff86a8 100644
--- a/internal/generators/nestjs/nestjs.go
+++ b/internal/generators/nestjs/nestjs.go
@@ -2,6 +2,7 @@ package nestjs
 
 import (
 	_ "embed"
+	"encoding/json"
 	"text/template"
 
 	"github.com/open-feature/cli/internal/flagset"
@@ -28,14 +29,25 @@ func openFeatureType(t flagset.FlagType) string {
 		return "boolean"
 	case flagset.StringType:
 		return "string"
+	case flagset.ObjectType:
+		return "object"
 	default:
 		return ""
 	}
 }
 
+func toJSONString(value any) string {
+	bytes, err := json.Marshal(value)
+	if err != nil {
+		return "{}"
+	}
+	return string(bytes)
+}
+
 func (g *NestJsGenerator) Generate(params *generators.Params[Params]) error {
 	funcs := template.FuncMap{
 		"OpenFeatureType": openFeatureType,
+		"ToJSONString":    toJSONString,
 	}
 
 	newParams := &generators.Params[any]{
@@ -49,8 +61,6 @@ func (g *NestJsGenerator) Generate(params *generators.Params[Params]) error {
 // NewGenerator creates a generator for NestJS.
 func NewGenerator(fs *flagset.Flagset) *NestJsGenerator {
 	return &NestJsGenerator{
-		CommonGenerator: *generators.NewGenerator(fs, map[flagset.FlagType]bool{
-			flagset.ObjectType: true,
-		}),
+		CommonGenerator: *generators.NewGenerator(fs, map[flagset.FlagType]bool{}),
 	}
 }
diff --git a/internal/generators/nestjs/nestjs.tmpl b/internal/generators/nestjs/nestjs.tmpl
index 971a74e..910b9bb 100644
--- a/internal/generators/nestjs/nestjs.tmpl
+++ b/internal/generators/nestjs/nestjs.tmpl
@@ -9,7 +9,7 @@ import type {
   EvaluationDetails,
   OpenFeatureModuleOptions,
 } from "@openfeature/nestjs-sdk";
-import { OpenFeatureModule, BooleanFeatureFlag, StringFeatureFlag, NumberFeatureFlag } from "@openfeature/nestjs-sdk";
+import { OpenFeatureModule, BooleanFeatureFlag, StringFeatureFlag, NumberFeatureFlag, ObjectFeatureFlag } from "@openfeature/nestjs-sdk";
 
 import type { GeneratedClient } from "./openfeature";
 import { getGeneratedClient } from "./openfeature";
@@ -100,7 +100,7 @@ interface TypedFeatureProps {
  * **Details:**
  * - flag key: `{{ .Key }}`
  * - description: `{{ .Description }}`
- * - default value: `{{ .DefaultValue }}`
+ * - default value: `{{ if eq (.Type | OpenFeatureType) "object"}}{{ .DefaultValue | ToJSONString }}{{ else }}{{ .DefaultValue | QuoteString }}{{ end }}`
  * - type: `{{ .Type | OpenFeatureType }}`
  *
  * Usage:
@@ -108,13 +108,13 @@ interface TypedFeatureProps {
  * @Get("/")
  * public async handleRequest(
  *     @{{ .Key | ToPascal }}()
- *     {{ .Key | ToCamel }}: Observable<EvaluationDetails<number>>,
+ *     {{ .Key | ToCamel }}: Observable<EvaluationDetails<{{ .Type | OpenFeatureType }}>>,
  * )
  * ```
  * @param {TypedFeatureProps} props The options for injecting the feature flag.
  * @returns {ParameterDecorator} The decorator function.
  */
 export function {{ .Key | ToPascal }}(props?: TypedFeatureProps): ParameterDecorator {
-  return {{ .Type | OpenFeatureType | ToPascal }}FeatureFlag({ flagKey: {{ .Key | Quote }}, defaultValue: {{ .DefaultValue | QuoteString }}, ...props });
+  return {{ .Type | OpenFeatureType | ToPascal }}FeatureFlag({ flagKey: {{ .Key | Quote }}, defaultValue: {{ if eq (.Type | OpenFeatureType) "object"}}{{ .DefaultValue | ToJSONString }}{{ else }}{{ .DefaultValue | QuoteString }}{{ end }}, ...props });
 }
 {{ end -}}