diff --git a/src/plugins/coreplugin/basefilewizardfactory.cpp b/src/plugins/coreplugin/basefilewizardfactory.cpp
index 3f7d4c771fb..0e4652b7e53 100644
--- a/src/plugins/coreplugin/basefilewizardfactory.cpp
+++ b/src/plugins/coreplugin/basefilewizardfactory.cpp
@@ -165,12 +165,16 @@ bool BaseFileWizardFactory::postGenerateOpenEditors(const GeneratedFiles &l, QSt
 {
     for (const GeneratedFile &file : std::as_const(l)) {
         if (file.attributes() & GeneratedFile::OpenEditorAttribute) {
-            if (!EditorManager::openEditor(file.filePath(), file.editorId())) {
-                if (errorMessage)
-                    *errorMessage = Tr::tr("Failed to open an editor for \"%1\".").
-                        arg(file.filePath().toUserOutput());
+            IEditor * const editor = EditorManager::openEditor(file.filePath(), file.editorId());
+            if (!editor) {
+                if (errorMessage) {
+                    *errorMessage = Tr::tr("Failed to open an editor for \"%1\".")
+                                        .arg(file.filePath().toUserOutput());
+                }
                 return false;
             }
+            editor->document()->formatContents();
+            editor->document()->save(nullptr);
         }
     }
     return true;
diff --git a/src/plugins/coreplugin/editormanager/editormanager.cpp b/src/plugins/coreplugin/editormanager/editormanager.cpp
index 261146797b4..e617e98d1c7 100644
--- a/src/plugins/coreplugin/editormanager/editormanager.cpp
+++ b/src/plugins/coreplugin/editormanager/editormanager.cpp
@@ -76,12 +76,14 @@
 #include <QTextCodec>
 #include <QTimer>
 #include <QVBoxLayout>
-#include <algorithm>
 
 #if defined(WITH_TESTS)
 #include <QTest>
 #endif
 
+#include <algorithm>
+#include <memory>
+
 enum { debugEditorManager=0 };
 
 static const char kCurrentDocumentPrefix[] = "CurrentDocument";
@@ -2975,6 +2977,27 @@ void EditorManager::populateOpenWithMenu(QMenu *menu, const FilePath &filePath)
     menu->setEnabled(anyMatches);
 }
 
+void EditorManager::runWithTemporaryEditor(const Utils::FilePath &filePath,
+                                           const std::function<void (IEditor *)> &callback)
+{
+    const MimeType mt = mimeTypeForFile(filePath, MimeMatchMode::MatchDefaultAndRemote);
+    const QList<IEditorFactory *> factories = Utils::transform(
+        EditorType::defaultEditorTypes(mt), [](EditorType *t) {
+            return t->asEditorFactory(); });
+    for (IEditorFactory * const factory : factories) {
+        if (!factory)
+            continue;
+        std::unique_ptr<IEditor> editor(factory->createEditor());
+        if (!editor)
+            continue;
+        editor->document()->setTemporary(true);
+        if (editor->document()->open(nullptr, filePath, filePath) != IDocument::OpenResult::Success)
+            continue;
+        callback(editor.get());
+        break;
+    }
+}
+
 /*!
     Returns reload behavior settings.
 */
diff --git a/src/plugins/coreplugin/editormanager/editormanager.h b/src/plugins/coreplugin/editormanager/editormanager.h
index 09218f42c3e..ea0fd5df8cd 100644
--- a/src/plugins/coreplugin/editormanager/editormanager.h
+++ b/src/plugins/coreplugin/editormanager/editormanager.h
@@ -143,6 +143,9 @@ public:
     static void addNativeDirAndOpenWithActions(QMenu *contextMenu, DocumentModel::Entry *entry);
     static void populateOpenWithMenu(QMenu *menu, const Utils::FilePath &filePath);
 
+    static void runWithTemporaryEditor(const Utils::FilePath &filePath,
+                                       const std::function<void(IEditor *)> &callback);
+
 public: // for tests
     static IDocument::ReloadSetting reloadSetting();
     static void setReloadSetting(IDocument::ReloadSetting behavior);
diff --git a/src/plugins/coreplugin/idocument.cpp b/src/plugins/coreplugin/idocument.cpp
index 5dcff9d3fc1..c6fdac85736 100644
--- a/src/plugins/coreplugin/idocument.cpp
+++ b/src/plugins/coreplugin/idocument.cpp
@@ -401,6 +401,13 @@ bool IDocument::setContents(const QByteArray &contents)
     return false;
 }
 
+/*!
+    Formats the contents of the document, if the implementation supports such functionality.
+*/
+void IDocument::formatContents()
+{
+}
+
 /*!
     Returns the absolute path of the file that this document refers to. May be
     empty for documents that are not backed by a file.
diff --git a/src/plugins/coreplugin/idocument.h b/src/plugins/coreplugin/idocument.h
index b771843056b..8fbca1d02f7 100644
--- a/src/plugins/coreplugin/idocument.h
+++ b/src/plugins/coreplugin/idocument.h
@@ -72,6 +72,7 @@ public:
 
     virtual QByteArray contents() const;
     virtual bool setContents(const QByteArray &contents);
+    virtual void formatContents();
 
     const Utils::FilePath &filePath() const;
     virtual void setFilePath(const Utils::FilePath &filePath);
diff --git a/src/plugins/projectexplorer/jsonwizard/jsonwizard.cpp b/src/plugins/projectexplorer/jsonwizard/jsonwizard.cpp
index 6bc09c5e58f..8204f7aaa25 100644
--- a/src/plugins/projectexplorer/jsonwizard/jsonwizard.cpp
+++ b/src/plugins/projectexplorer/jsonwizard/jsonwizard.cpp
@@ -424,6 +424,10 @@ void JsonWizard::openFiles(const JsonWizard::GeneratorFiles &files)
 {
     QString errorMessage;
     bool openedSomething = stringValue("DoNotOpenFile") == "true";
+    static const auto formatFile = [](Core::IEditor *editor) {
+        editor->document()->formatContents();
+        editor->document()->save(nullptr);
+    };
     for (const JsonWizard::GeneratorFile &f : files) {
         const Core::GeneratedFile &file = f.file;
         if (!file.filePath().exists()) {
@@ -454,8 +458,12 @@ void JsonWizard::openFiles(const JsonWizard::GeneratorFiles &files)
                 break;
             } else if (file.attributes() & Core::GeneratedFile::TemporaryFile) {
                 editor->document()->setTemporary(true);
+            } else {
+                formatFile(editor);
             }
             openedSomething = true;
+        } else if (file.filePath().fileSize() < 100 * 1024 ) {
+            Core::EditorManager::runWithTemporaryEditor(file.filePath(), formatFile);
         }
     }
 
diff --git a/src/plugins/texteditor/textdocument.cpp b/src/plugins/texteditor/textdocument.cpp
index f8512e9a111..bff716ea8ba 100644
--- a/src/plugins/texteditor/textdocument.cpp
+++ b/src/plugins/texteditor/textdocument.cpp
@@ -717,6 +717,12 @@ bool TextDocument::setContents(const QByteArray &contents)
     return setPlainText(QString::fromUtf8(contents));
 }
 
+void TextDocument::formatContents()
+{
+    d->m_indenter->format({{document()->firstBlock().blockNumber() + 1,
+                            document()->lastBlock().blockNumber() + 1}});
+}
+
 bool TextDocument::shouldAutoSave() const
 {
     return d->m_autoSaveRevision != d->m_document.revision();
diff --git a/src/plugins/texteditor/textdocument.h b/src/plugins/texteditor/textdocument.h
index 6527aefd5f4..a4dd3dd45f0 100644
--- a/src/plugins/texteditor/textdocument.h
+++ b/src/plugins/texteditor/textdocument.h
@@ -103,6 +103,7 @@ public:
     // IDocument implementation.
     QByteArray contents() const override;
     bool setContents(const QByteArray &contents) override;
+    void formatContents() override;
     bool shouldAutoSave() const override;
     bool isModified() const override;
     bool isSaveAsAllowed() const override;