diff --git a/src/kdefrontend/datasources/FileInfoDialog.cpp b/src/kdefrontend/datasources/FileInfoDialog.cpp
index 3a8e6f10c..70e012a8e 100644
--- a/src/kdefrontend/datasources/FileInfoDialog.cpp
+++ b/src/kdefrontend/datasources/FileInfoDialog.cpp
@@ -1,204 +1,207 @@
 /***************************************************************************
     File                 : FileInfoDialog.cpp
     Project              : LabPlot
     Description          : import file data dialog
     --------------------------------------------------------------------
     Copyright            : (C) 2009-2018 by Alexander Semke (alexander.semke@web.de)
     Copyright            : (C) 2015-2016 Stefan-Gerlach (stefan.gerlach@uni.kn)
 
  ***************************************************************************/
 
 /***************************************************************************
  *                                                                         *
  *  This program is free software; you can redistribute it and/or modify   *
  *  it under the terms of the GNU General Public License as published by   *
  *  the Free Software Foundation; either version 2 of the License, or      *
  *  (at your option) any later version.                                    *
  *                                                                         *
  *  This program is distributed in the hope that it will be useful,        *
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of         *
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
  *  GNU General Public License for more details.                           *
  *                                                                         *
  *   You should have received a copy of the GNU General Public License     *
  *   along with this program; if not, write to the Free Software           *
  *   Foundation, Inc., 51 Franklin Street, Fifth Floor,                    *
  *   Boston, MA  02110-1301  USA                                           *
  *                                                                         *
  ***************************************************************************/
 
 #include "FileInfoDialog.h"
 #include "backend/datasources/LiveDataSource.h"
 #include "backend/datasources/filters/AsciiFilter.h"
 #include "backend/datasources/filters/FITSFilter.h"
 #include "backend/datasources/filters/NgspiceRawAsciiFilter.h"
 
 #include <QDialogButtonBox>
 #include <QDir>
 #include <QIcon>
 #include <QFileInfo>
 #include <QProcess>
 #include <QVBoxLayout>
 
 #include <KLocalizedString>
 #include <KSharedConfig>
 #include <KWindowConfig>
 
 /*!
 \class ImportWidget
 \brief Provides a dialog containing the information about the files to be imported.
 
 \ingroup kdefrontend
 */
 
 FileInfoDialog::FileInfoDialog(QWidget* parent) : QDialog(parent) {
 
 	m_textEditWidget.setReadOnly(true);
 	m_textEditWidget.setLineWrapMode(QTextEdit::NoWrap);
 
 	QVBoxLayout* layout = new QVBoxLayout(this);
 	layout->addWidget(&m_textEditWidget);
 
 	QDialogButtonBox *buttonBox = new QDialogButtonBox(QDialogButtonBox::Ok);
 	connect(buttonBox, &QDialogButtonBox::rejected, this, &FileInfoDialog::reject);
 	connect(buttonBox, &QDialogButtonBox::accepted, this, &FileInfoDialog::accept);
 
 	layout->addWidget(buttonBox);
 
 	setWindowIcon(QIcon::fromTheme("help-about"));
 	setWindowTitle(i18nc("@title:window", "File Information"));
 	setAttribute(Qt::WA_DeleteOnClose);
 
 	setLayout(layout);
 
 	QTimer::singleShot(0, this, &FileInfoDialog::loadSettings);
 }
 
 void FileInfoDialog::loadSettings() {
 	//restore saved settings
 	KConfigGroup conf(KSharedConfig::openConfig(), "FileInfoDialog");
 	KWindowConfig::restoreWindowSize(windowHandle(), conf);
 }
 
 FileInfoDialog::~FileInfoDialog() {
 	//save current settings
 	KConfigGroup conf(KSharedConfig::openConfig(), "FileInfoDialog");
 	KWindowConfig::saveWindowSize(windowHandle(), conf);
 }
 
 void FileInfoDialog::setFiles(QStringList& files) {
 	QString infoString;
 
 	for (const auto& fileName: files) {
 		if(fileName.isEmpty())
 			continue;
 
 		if (!infoString.isEmpty())
 			infoString += "<br><br><br>";
 
 		infoString += fileInfoString(fileName);
 	}
 
 	m_textEditWidget.document()->setHtml(infoString);
 }
 
 /*!
     returns a string containing the general information about the file \c name
     and some content specific information
     (number of columns and lines for ASCII, color-depth for images etc.).
  */
 QString FileInfoDialog::fileInfoString(const QString& name) const {
 	QString infoString;
 	QFileInfo fileInfo;
 	QString fileTypeString;
 	QIODevice *file = new QFile(name);
 
 	QString fileName;
 #ifdef Q_OS_WIN
 	if (name.at(1) != QLatin1Char(':'))
 		fileName = QDir::homePath() + name;
 	else
 		fileName = name;
 #else
 	if (name.at(0) != QDir::separator())
 		fileName = QDir::homePath() + QDir::separator() + name;
 	else
 		fileName = name;
 #endif
 	if(file==0)
 		file = new QFile(fileName);
 
 	if (file->open(QIODevice::ReadOnly)) {
 		QStringList infoStrings;
 		infoStrings << "<u><b>" + fileName + "</b></u><br>";
 
 		// file type and type specific information about the file
 #ifdef Q_OS_LINUX
 		QProcess *proc = new QProcess();
 		QStringList args;
 		args<<"-b"<<fileName;
 		proc->start( "file", args);
 
 		if(proc->waitForReadyRead(1000) == false)
 			infoStrings << i18n("Could not open file %1 for reading.", fileName);
 		else {
 			fileTypeString = proc->readLine();
 			if( fileTypeString.contains(i18n("cannot open")) )
 				fileTypeString="";
 			else {
 				fileTypeString.remove(fileTypeString.length()-1,1);	// remove '\n'
 			}
 		}
 		infoStrings << i18n("File type: %1", fileTypeString);
 #endif
 
 		//depending on the file type, generate additional information about the file:
 		infoStrings << "<br>";
 		AbstractFileFilter::FileType fileType = AbstractFileFilter::fileType(fileName);
 		switch(fileType) {
 		case AbstractFileFilter::Ascii:
 			infoStrings << AsciiFilter::fileInfoString(fileName);
 			break;
 		case AbstractFileFilter::Binary:
 			//TODO infoStrings << BinaryFilter::fileInfoString(fileName);
 			break;
 		case AbstractFileFilter::Image:
 			//TODO infoStrings << ImageFilter::fileInfoString(fileName);
 			break;
 		case AbstractFileFilter::HDF5:
 			//TODO infoStrings << HDF5Filter::fileInfoString(fileName);
 			break;
 		case AbstractFileFilter::NETCDF:
 			//TODO infoStrings << NETCDFFilter::fileInfoString(fileName);
 			break;
 		case AbstractFileFilter::FITS:
 			infoStrings << FITSFilter::fileInfoString(fileName);
 			break;
+		case AbstractFileFilter::Json:
+			//TODO infoStrings << JsonFilter::fileInfoString(fileName);
+			break;
 		case AbstractFileFilter::ROOT:
 			//TODO infoStrings << ROOTFilter::fileInfoString(fileName);
 			break;
 		case AbstractFileFilter::NgspiceRawAscii:
 			infoStrings << NgspiceRawAsciiFilter::fileInfoString(fileName);
 			break;
 		}
 
 		//general information about the file
 		infoStrings << "<br>";
 		fileInfo.setFile(fileName);
 
 		infoStrings << i18n("Readable: %1", fileInfo.isReadable() ? i18n("yes") : i18n("no"));
 		infoStrings << i18n("Writable: %1", fileInfo.isWritable() ? i18n("yes") : i18n("no"));
 		infoStrings << i18n("Executable: %1", fileInfo.isExecutable() ? i18n("yes") : i18n("no"));
 
 		infoStrings << i18n("Created: %1", fileInfo.created().toString());
 		infoStrings << i18n("Last modified: %1", fileInfo.lastModified().toString());
 		infoStrings << i18n("Last read: %1", fileInfo.lastRead().toString());
 		infoStrings << i18n("Owner: %1", fileInfo.owner());
 		infoStrings << i18n("Group: %1", fileInfo.group());
 		infoStrings << i18n("Size: %1", i18np("%1 cByte", "%1 cBytes", fileInfo.size()));
 		infoString += infoStrings.join("<br>");
 	} else
 		infoString += i18n("Could not open file %1 for reading.", fileName);
 
 	return infoString;
 }