Sequelize showing error: Unexpected token u in JSON at position 0 - mysql

Question

I am trying to update a record in mysql database using sequelize but it is not working.
I am getting this error
Unexpected token u in JSON at position 0
Model
module.exports = sequelize.define("branches", {
address: Sequelize.TEXT(),
company: Sequelize.STRING(),
codeConfig: {
type: Sequelize.STRING,
allowNull: false,
get: function () {
return JSON.parse(this.getDataValue('codeConfig'));
},
set: function (val) {
return this.setDataValue('codeConfig', JSON.stringify(val));
}
},
});
Update function
router.put('/:id', async (req, res) => {
const { address, company} = req.body;
try {
const branches = await Branches.findOne({ where: { code: req.params.id } });
if (!branches) return res.json({ msg: "Branch Not Found" });
Branches.update({ "address": "No. 10 distreet street" }, {
where: {
code: "WHJ5uBdriI"
}
}).then(function (newBranch) {
return res.json({ msg: "Updated" });
});
} catch (error) {
console.error(error.message);
res.status(500).send("Server Error");
}
});
Error output

Answer 1

Add autoJsonMap: false, to your sequelize's dialectOptions
Example:
let sequelize = new Sequelize(DATABASE, USER, PASSWORD, {
// some other options
dialectOptions: {
autoJsonMap: false,
}
});
Reference:
https://github.com/sequelize/sequelize/issues/12583

Answer 2

i have noticed that before sequelize make a field update, it fetches through all fields, and then execute a getter function if exist, so for that i added an if check inside a getter, here is the code now the model.update working:
get: function () {
if(this.getDataValue('codeConfig') !== undefined){
/// appentely sequelize tried to parse the value of 'codeConfig' but its undefined since you are updating only address field.
return JSON.parse(this.getDataValue('codeConfig'));
}
},