diff --git a/src/plugins/qmldesigner/components/collectioneditor/collectiondetails.cpp b/src/plugins/qmldesigner/components/collectioneditor/collectiondetails.cpp
index 4cc6717d914..0e6cb344e2e 100644
--- a/src/plugins/qmldesigner/components/collectioneditor/collectiondetails.cpp
+++ b/src/plugins/qmldesigner/components/collectioneditor/collectiondetails.cpp
@@ -238,6 +238,7 @@ bool CollectionDetails::setPropertyValue(int row, int column, const QVariant &va
         return false;
 
     element.insert(d->properties.at(column).name, QJsonValue::fromVariant(value));
+    markChanged();
     return true;
 }
 
@@ -458,16 +459,19 @@ void CollectionDetails::resetPropertyTypes()
         resetPropertyType(property);
 }
 
-QString CollectionDetails::getCollectionAsJsonString() const
+QJsonArray CollectionDetails::getCollectionAsJsonArray() const
 {
     QJsonArray collectionArray;
 
     for (const QJsonObject &element : std::as_const(d->elements))
         collectionArray.push_back(element);
 
-    QString collectionString = QString::fromUtf8(QJsonDocument(collectionArray).toJson());
+    return collectionArray;
+}
 
-    return collectionString;
+QString CollectionDetails::getCollectionAsJsonString() const
+{
+    return QString::fromUtf8(QJsonDocument(getCollectionAsJsonArray()).toJson());
 }
 
 QString CollectionDetails::getCollectionAsCsvString() const
diff --git a/src/plugins/qmldesigner/components/collectioneditor/collectiondetails.h b/src/plugins/qmldesigner/components/collectioneditor/collectiondetails.h
index c35068ce6f0..202ba9bb003 100644
--- a/src/plugins/qmldesigner/components/collectioneditor/collectiondetails.h
+++ b/src/plugins/qmldesigner/components/collectioneditor/collectiondetails.h
@@ -106,6 +106,8 @@ public:
     QString getCollectionAsJsonString() const;
     QString getCollectionAsCsvString() const;
 
+    QJsonArray getCollectionAsJsonArray() const;
+
     static void registerDeclarativeType();
 
     CollectionDetails &operator=(const CollectionDetails &other);
diff --git a/src/plugins/qmldesigner/components/collectioneditor/collectiondetailsmodel.cpp b/src/plugins/qmldesigner/components/collectioneditor/collectiondetailsmodel.cpp
index ccff8eb34e7..048d5eac4e4 100644
--- a/src/plugins/qmldesigner/components/collectioneditor/collectiondetailsmodel.cpp
+++ b/src/plugins/qmldesigner/components/collectioneditor/collectiondetailsmodel.cpp
@@ -12,6 +12,7 @@
 #include <QFile>
 #include <QFileInfo>
 #include <QJsonArray>
+#include <QJsonDocument>
 #include <QJsonObject>
 #include <QJsonParseError>
 
@@ -413,7 +414,7 @@ void CollectionDetailsModel::loadCollection(const ModelNode &sourceNode, const Q
 
 bool CollectionDetailsModel::saveCurrentCollection()
 {
-    return saveCollection({}, &m_currentCollection);
+    return saveCollection({});
 }
 
 bool CollectionDetailsModel::exportCollection(const QString &filePath)
@@ -599,45 +600,44 @@ bool CollectionDetailsModel::saveCollection(const QString &filePath, CollectionD
 {
     bool saved = false;
 
-    auto saveSingleCollection = [&](CollectionDetails &singleCollection) {
+    const ModelNode node = m_currentCollection.reference().node;
+    QString path = CollectionEditor::getSourceCollectionPath(node);
+    QString saveFormat = CollectionEditor::getSourceCollectionType(node);
 
-        const ModelNode node = singleCollection.reference().node;
-        QString path = CollectionEditor::getSourceCollectionPath(node);
-        QString saveFormat = CollectionEditor::getSourceCollectionType(node);
+    QFile sourceFile(path);
 
-        if (!filePath.isEmpty()) {
-            QUrl url(filePath);
-            path = url.isLocalFile() ? QFileInfo(url.toLocalFile()).absoluteFilePath() : url.toString();
-            saveFormat = url.isLocalFile() ? QFileInfo(url.toLocalFile()).suffix().toLower() : saveFormat;
+    if (!filePath.isEmpty()) {
+        QUrl url(filePath);
+        path = url.isLocalFile() ? QFileInfo(url.toLocalFile()).absoluteFilePath() : url.toString();
+        saveFormat = url.isLocalFile() ? QFileInfo(url.toLocalFile()).suffix().toLower() : saveFormat;
+        QString content = saveFormat == "json" ? collection->getCollectionAsJsonString()
+                        : saveFormat == "csv" ? collection->getCollectionAsCsvString() : QString();
+
+        sourceFile.setFileName(path);
+
+        if (sourceFile.open(QFile::WriteOnly))
+            saved = sourceFile.write(content.toUtf8());
+    } else if (filePath.isEmpty() && sourceFile.open(QFile::ReadWrite)) {
+        QJsonParseError jpe;
+        QJsonDocument document = QJsonDocument::fromJson(sourceFile.readAll(), &jpe);
+
+        if (jpe.error == QJsonParseError::NoError) {
+            QJsonObject obj = document.object();
+
+            for (const CollectionDetails &openedCollection : std::as_const(m_openedCollections))
+                obj[openedCollection.reference().name] = openedCollection.getCollectionAsJsonArray();
+
+            document.setObject(obj);
+            saved = sourceFile.write(document.toJson());
+
+            if (saved)
+                collection->markSaved();
         }
-
-        saved = saveCollectionFromString(path, (saveFormat == "json") ? singleCollection.getCollectionAsJsonString() :
-                                                   (saveFormat == "csv")  ? singleCollection.getCollectionAsCsvString() : QString());
-
-        if (saved && filePath.isEmpty())
-            singleCollection.markSaved();
-    };
-
-    if (!collection) {
-        for (CollectionDetails &openedCollection : m_openedCollections)
-            saveSingleCollection(openedCollection);
-    } else {
-        saveSingleCollection(*collection);
     }
 
     return saved;
 }
 
-bool CollectionDetailsModel::saveCollectionFromString(const QString &path, const QString &content)
-{
-    QFile file(path);
-
-    if (file.open(QFile::WriteOnly) && file.write(content.toUtf8()))
-        return true;
-
-    return false;
-}
-
 QString CollectionDetailsModel::warningToString(DataTypeWarning::Warning warning) const
 {
     return DataTypeWarning::getDataTypeWarningString(warning);
diff --git a/src/plugins/qmldesigner/components/collectioneditor/collectiondetailsmodel.h b/src/plugins/qmldesigner/components/collectioneditor/collectiondetailsmodel.h
index bf87d3838f1..9e1fada31af 100644
--- a/src/plugins/qmldesigner/components/collectioneditor/collectiondetailsmodel.h
+++ b/src/plugins/qmldesigner/components/collectioneditor/collectiondetailsmodel.h
@@ -82,7 +82,6 @@ private:
     void loadJsonCollection(const QString &source, const QString &collection);
     void loadCsvCollection(const QString &source, const QString &collectionName);
     bool saveCollection(const QString &filePath = {}, CollectionDetails *collection = nullptr);
-    bool saveCollectionFromString(const QString &path, const QString &content);
     QVariant variantFromString(const QString &value);
 
     QHash<CollectionReference, CollectionDetails> m_openedCollections;