javascript - Js fetch api post undefined as value not string

one text

Solution:

There are different ways to check the data before set:

• !!objData.kenuze (for check the Truthy and Falsy)
• ??objData.Kenuze (for check is Null or not)
• typeof objData.kenuze !== 'undefined' (note that typeof return String as response)

and finally, need to check with some if statement:

if (!!objData.kenuze) {
    formdata.append('keuze', objdata.keuze);
}