title: JSON.stringify in Node.js
body: <p>Why when I use JSON.stringify in node.js on data from database request I get objects with the data itself, and if I use console.log I get a lot of additional parameters like dataValues, _previousDataValues, _modelOptions....
  I use sequelize.js</p>
  
  <p>console.log(JSON.stringify(data,'',2))</p>
  
  <pre><code>{
    id:1
  }
  </code></pre>
  
  <p>console.log(data)</p>
  
  <pre><code>Kindergarten_data {
    dataValues:
      { id: 1}
   _changed: {},
    _modelOptions:
     { timestamps: true,
       validate: {},
       freezeTableName: true,
       underscored: false,
       underscoredAll: false,
       paranoid: false,
       rejectOnEmpty: false,
       whereCollection: null,
       schema: null,
       schemaDelimiter: '',
       defaultScope: {},
       scopes: [],
       indexes: [],...
  </code></pre>