MongoDB Not Sending the API Back?

I have been trying to solve a query but there are some problems in it..

I have been using a database tool mongoDB and now am having troubles sending API via the selects fields limiting query..

Here's the code,

 // 4) Field Limiting
    if (req.query.fields) {
      const fields = req.query.fields.split(',').join('');
      query = query.select(fields);
    } else {
      query = query.select('-_v');
    }

    const tours = await query;

    //Response
    res.status(200).json({
      status: 'success',
      result: tours.length,
      data: {
        tours
      }
    });
  } catch (err) {
    res.status(404).json({
      status: 'failed',
      message: err
    });
  }
};

now it is supposed to send a result like this, enter image description here

but instead it is showing something like this, enter image description here

so its sending the API back,

someone please help..

I have been using VS Code as code editor and Postman software for testing APIs

Down is the Postman API request..

enter image description here