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POST
/
cart
/
add
{
  "productId": 42,
  "quantity": 2
}

{
  "id": 10,
  "cartId": 1,
  "productId": 42,
  "quantity": 2
}

​
Authentication

This endpoint requires authentication. Include a valid JWT token in the Authorization header. 
Authorization: Bearer <token>

​
Request Body

​
productId
integer
required
The ID of the product to add to the cart
​
quantity
integer
required
The quantity of the product to add. Must be at least 1.
{
  "productId": 42,
  "quantity": 2
}

​
Response

Returns the created or updated cart item.
​
id
integer
required
Unique identifier for the cart item
​
cartId
integer
required
ID of the cart this item belongs to
​
productId
integer
required
ID of the product that was added
​
quantity
integer
required
Total quantity of the product in the cart
{
  "id": 10,
  "cartId": 1,
  "productId": 42,
  "quantity": 2
}

​
Behavior

  • If the product is already in the cart, the quantity will be incremented by the specified amount
  • If the cart doesn’t exist yet, it will be created automatically
  • The operation uses an atomic upsert to prevent race conditions

​
Error Responses

​
Product Not Found (404)

{
  "message": "Producto no encontrado"
}

​
Insufficient Stock (400)

{
  "message": "Stock insuficiente"
}

​
Validation Error (400)

{
  "errors": [
    {
      "field": "quantity",
      "message": "La cantidad debe ser al menos 1"
    }
  ]
}

​
Unauthorized (401)

{
  "message": "Usuario no autenticado"
}

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