diff --git a/misc/client-sdk-testsuite/src/manifest.yml b/misc/client-sdk-testsuite/src/manifest.yml
index 168150b..af5bed1 100644
--- a/misc/client-sdk-testsuite/src/manifest.yml
+++ b/misc/client-sdk-testsuite/src/manifest.yml
@@ -4,4 +4,9 @@ title: SDK Test
 version: 0.0.0
 description: |
   Suite de tests pour le SDK client
-tags: ["test"]
\ No newline at end of file
+tags: ["test"]
+
+metadata:
+  paths:
+    icon: /icon.png
+  minimumRole: visitor
\ No newline at end of file
diff --git a/misc/client-sdk-testsuite/src/public/icon.png b/misc/client-sdk-testsuite/src/public/icon.png
new file mode 100644
index 0000000..b6862b4
Binary files /dev/null and b/misc/client-sdk-testsuite/src/public/icon.png differ
diff --git a/misc/client-sdk-testsuite/src/public/index.html b/misc/client-sdk-testsuite/src/public/index.html
index 0b7efa7..b1d9e97 100644
--- a/misc/client-sdk-testsuite/src/public/index.html
+++ b/misc/client-sdk-testsuite/src/public/index.html
@@ -4,6 +4,7 @@
     <meta charset="utf-8" />
     <title>Client SDK Test suite</title>
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <link rel="icon" type="image/png" href="/icon.png">
     <link rel="stylesheet" href="/vendor/mocha.css" />
     <style>
       body {
diff --git a/pkg/app/manifest.go b/pkg/app/manifest.go
index b610df8..32a5d1d 100644
--- a/pkg/app/manifest.go
+++ b/pkg/app/manifest.go
@@ -12,12 +12,12 @@ import (
 type ID string
 
 type Manifest struct {
-	ID          ID             `yaml:"id" json:"id"`
-	Version     string         `yaml:"version" json:"version"`
-	Title       string         `yaml:"title" json:"title"`
-	Description string         `yaml:"description" json:"description"`
-	Tags        []string       `yaml:"tags" json:"tags"`
-	Metadata    map[string]any `yaml:"metadata" json:"metadata"`
+	ID          ID       `yaml:"id" json:"id"`
+	Version     string   `yaml:"version" json:"version"`
+	Title       string   `yaml:"title" json:"title"`
+	Description string   `yaml:"description" json:"description"`
+	Tags        []string `yaml:"tags" json:"tags"`
+	Metadata    MapStr   `yaml:"metadata" json:"metadata"`
 }
 
 type MetadataValidator func(map[string]any) (bool, error)
diff --git a/pkg/app/map_str.go b/pkg/app/map_str.go
new file mode 100644
index 0000000..8695af0
--- /dev/null
+++ b/pkg/app/map_str.go
@@ -0,0 +1,61 @@
+package app
+
+import (
+	"fmt"
+
+	"github.com/pkg/errors"
+)
+
+type MapStr map[string]interface{}
+
+func MapStrUnion(dict1 MapStr, dict2 MapStr) MapStr {
+	dict := MapStr{}
+
+	for k, v := range dict1 {
+		dict[k] = v
+	}
+
+	for k, v := range dict2 {
+		dict[k] = v
+	}
+	return dict
+}
+
+func (ms *MapStr) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	var result map[interface{}]interface{}
+	err := unmarshal(&result)
+	if err != nil {
+		return errors.WithStack(err)
+	}
+	*ms = cleanUpInterfaceMap(result)
+	return nil
+}
+
+func cleanUpInterfaceArray(in []interface{}) []interface{} {
+	result := make([]interface{}, len(in))
+	for i, v := range in {
+		result[i] = cleanUpMapValue(v)
+	}
+	return result
+}
+
+func cleanUpInterfaceMap(in map[interface{}]interface{}) MapStr {
+	result := make(MapStr)
+	for k, v := range in {
+		result[fmt.Sprintf("%v", k)] = cleanUpMapValue(v)
+	}
+	return result
+}
+
+func cleanUpMapValue(v interface{}) interface{} {
+	switch v := v.(type) {
+	case []interface{}:
+		return cleanUpInterfaceArray(v)
+	case map[interface{}]interface{}:
+		return cleanUpInterfaceMap(v)
+	case string:
+		return v
+	default:
+		return fmt.Sprintf("%v", v)
+	}
+}
diff --git a/pkg/app/metadata/named_path.go b/pkg/app/metadata/named_path.go
index a2ac554..c66bb81 100644
--- a/pkg/app/metadata/named_path.go
+++ b/pkg/app/metadata/named_path.go
@@ -26,28 +26,23 @@ func WithNamedPathsValidator(names ...NamedPath) app.MetadataValidator {
 			return true, nil
 		}
 
-		paths, ok := rawPaths.(map[any]any)
+		paths, ok := rawPaths.(app.MapStr)
 		if !ok {
 			return false, errors.Errorf("metadata['paths']: unexpected named path value type '%T'", rawPaths)
 		}
 
 		for n, p := range paths {
-			name, ok := n.(string)
-			if !ok {
-				return false, errors.Errorf("metadata['paths']: unexpected named path type '%T'", n)
-			}
-
-			if _, exists := set[NamedPath(name)]; !exists {
-				return false, errors.Errorf("metadata['paths']: unexpected named path '%s'", name)
+			if _, exists := set[NamedPath(n)]; !exists {
+				return false, errors.Errorf("metadata['paths']: unexpected named path '%s'", n)
 			}
 
 			path, ok := p.(string)
 			if !ok {
-				return false, errors.Errorf("metadata['paths']['%s']: unexpected named path value type '%T'", name, path)
+				return false, errors.Errorf("metadata['paths']['%s']: unexpected named path value type '%T'", n, path)
 			}
 
 			if !strings.HasPrefix(path, "/") {
-				return false, errors.Errorf("metadata['paths']['%s']: named path value should start with a '/'", name)
+				return false, errors.Errorf("metadata['paths']['%s']: named path value should start with a '/'", n)
 			}
 		}
 
diff --git a/pkg/module/app/module.go b/pkg/module/app/module.go
index 9f1f6ac..ce3d281 100644
--- a/pkg/module/app/module.go
+++ b/pkg/module/app/module.go
@@ -14,11 +14,12 @@ type Module struct {
 }
 
 type gojaManifest struct {
-	ID          string   `goja:"id" json:"id"`
-	Version     string   `goja:"version" json:"version"`
-	Title       string   `goja:"title" json:"title"`
-	Description string   `goja:"description" json:"description"`
-	Tags        []string `goja:"tags" json:"tags"`
+	ID          string         `goja:"id" json:"id"`
+	Version     string         `goja:"version" json:"version"`
+	Title       string         `goja:"title" json:"title"`
+	Description string         `goja:"description" json:"description"`
+	Tags        []string       `goja:"tags" json:"tags"`
+	Metadata    map[string]any `goja:"metadata" json:"metadata"`
 }
 
 func toGojaManifest(manifest *app.Manifest) *gojaManifest {
@@ -28,6 +29,7 @@ func toGojaManifest(manifest *app.Manifest) *gojaManifest {
 		Title:       manifest.Title,
 		Description: manifest.Description,
 		Tags:        manifest.Tags,
+		Metadata:    manifest.Metadata,
 	}
 }