无法使用获取API发送获取请求

Question

I am trying to fetch some data from the server and I am using react.js and the fetch api but a get that

SyntaxError: Unexpected token < in JSON at position 0 this is my code for fetching the data

componentDidMount() {
    // fetch all categories from the server
    fetch('http:localhost:5555/categories')
        .then(res => res.json())
        .then(categories => {
            this.setState({ loading: false });
            console.log(categories);
            this.setState({ categories });
        })
        .catch(err => {
            this.setState({ loading: false });
            console.log(err);
        });
}

any thoughts

Answer 1

I think the problem is in your fetch method and you write the url in the wrong form try to change the url from

http:localhost:5555/categories

to

http://localhost:5555/categories

any try to fetch again