javascript fetching an API json rest cannot access the data

Question

This is driving crazy, I have a API json rest that I can access perfectly from thefirefox extension RESTED and directly from the browser I can see the data but when I tried my code it said "code: "rest_cannot_access", message: "Only authenticated users can access the REST API.". So I don't understand why.

It's a wordpress rest api plugin, and I tried to get the data from fetch javascript.this is the url http://laprensainsolita.com/wp-json/wp/v2/posts

this is my code to test.

    .then(response => {
      return response.json()
    })
    .then(data => {
      console.log(data)
    })
    .catch(err => {
      console.log(data)
    })

Answer 1

I think you should take a look here https://developer.wordpress.org/rest-api/using-the-rest-api/authentication/

For sure you are logged in by a cookie. Try to open a "private browser window" and you will get the same error.