How can i pass a parameters to action method using javascript fetch?

Question

I'm using js fetch to call to an action method(in asp.net mvc), but I need to pass parameters to the method.

How can I pass this data using fetch ?

I'm trying to use this code but the data didn't pass:

fetch(url, {
    data: { repositoryName: "dada" }
})
.then(() => {
   console.log("test");
});

Answer 1

According to the documentation second parameter shouldn't contain data property.

I guess you need to use body property(you can use JSON string, FormData or URLSearchParams here basing on your needs, see docs ):

fetch(url, {
    method: "POST",
    body: JSON.stringify({ repositoryName: "dada" })        
}).then(() => { ... })

Also in this simple example it's possible to simply use query string like this:

fetch(url + '?repositoryName=dada').then(() => { ... })

Note that GET requests cannot have body so if your MVC action is GET action then you have to use query strings like in my second example.