Why sequelize return result different than console.log(return)? - express

Question

I try to send the data through postman and the data result is clean(without another property). But when I try to console.log(data), there are many other properties. I read on another thread(Sequelize return result is different than console.log(result)), this is because res.json serialized the data into a plain object with model props from dataValues. But how can res.json only get the dataValues property meanwhile the other properties are ignored?
my code:
async getItems(req, res, next){
const data = await Item.findAll({
attributes: ['id', 'name', 'price']
});
console.log(data);
return res.status(200).json(data);
};
postman result:
[
{
"id": 1,
"name": "PS5",
"price": 600
},
{
"id": 2,
"name": "XBOX X",
"price": 400
}
]
console.log(data) result:
[
Item {
dataValues: {
id: 1,
name: 'PS5',
price: 600
},
_previousDataValues: {
id: 1,
name: 'PS5',
price: 600
},
uniqno: 1,
_changed: Set(0) {},
_options: {
isNewRecord: false,
_schema: null,
_schemaDelimiter: '',
raw: true,
attributes: [Array]
},
isNewRecord: false
},
Item {
dataValues: {
id: 2,
name: 'XBOX X',
price: 400
},
_previousDataValues: {
id: 2,
name: 'XBOX X',
price: 400
},
uniqno: 1,
_changed: Set(0) {},
_options: {
isNewRecord: false,
_schema: null,
_schemaDelimiter: '',
raw: true,
attributes: [Array]
},
isNewRecord: false
}
]

Answer 1

Sequelize models implement a toJSON method which JSON.stringify calls under the hood. You can also call model.toJSON() to get cleaner logs:
https://sequelize.org/docs/v6/core-concepts/model-instances/#note-logging-instances
Another example:
JSON.stringify({
toJSON() {
return 'arbitrary value';
}
});
// => "arbitrary value"