Don't know how to deal with it - node.js

Question

Hello guys i am validating product create request in my validate middleware then if it validates it goes to products/create endpoint problem i am having is that to create product you need userId so i know which user created it, for it i decode my jwt token in products/create endpoint and then assign it to product when creating it. but problem is that product shouldn't have same title name for same user for example user A can't have 2 products with same title idk how i can do that cuz i decode jwt in the final enpoint while i validate request in the middleware
schema for validating
export const productCreateSchema = yup.object().shape({
title: yup.string().required('Product title is required'),
price: yup.number().required('Product price is required').min(5),
type: yup
.string()
.oneOf(['pullover', 'jeans', 'jacket', 'hoodie'])
.required('Product type is required'),
condition: yup
.string()
.oneOf(['new', 'old'])
.required(`Product condition is required`),
size: yup
.string()
.oneOf(['xs', 's', 'm', 'xl', 'xll', 'xxl'])
.required('Product size is required'),
});
endpoint
router.post('/', async (req: CustomRequest, res) => {
const { title, price, type, condition, size } = req.body;
const conditionRecord = await ProductCondition.findOne({
where: { condition },
});
const typeRecord = await ProductType.findOne({
where: { type },
});
const sizeRecord = await ProductSize.findOne({
where: { size },
});
console.log('req.user: ', req.user);
Product.create({
user_id: req.user!.userId,
title: req.body.title,
price: req.body.price,
type_id: typeRecord!.dataValues.id,
condition_id: conditionRecord!.dataValues.id,
size_id: sizeRecord!.dataValues.id,
});
res.status(200).send('test'); // i actually send some data but its too big to post
});
export default router;```
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