Uncaught SyntaxError: Unexpected token <

Question

 jsonp = (url, callback) => {
        var callbackName = 'jsonp_callback_' + Math.round(100000 * Math.random());
        window[callbackName] = function(data) {
            delete window[callbackName];
            document.body.removeChild(script);
            callback(data);
        };

        var script = document.createElement('script');
        script.src = url + (url.indexOf('?') >= 0 ? '&' : '?') + 'callback=' + callbackName;
        document.body.appendChild(script);
    }

componentDidMount() {
 this.jsonp('https://www.naver.com', function(data) {
            alert(data.meta.description);
        });
}

But I get:

Uncaught SyntaxError: Unexpected token < error...

How can I resolve this?

Which line do you get the error on? I don't see any `<` in your snippet above. — Nisarg Shah, Sep 04 '17 at 05:06
The error is on 'componentDidMount()' you have to write 'function componentDidMount()' — adda82, Sep 04 '17 at 05:09
You have not forgot to transpile your code from JSX into JS? — Amid, Sep 04 '17 at 05:48
i replace the code omponentDidMount() { this.jsonp('https://www.naver.com'); } but same error occur... — kekeee, Sep 04 '17 at 06:17
did you enable `ES Class Fields & Static Properties` (currently stage 3) on your babel config? — Nir Weber, Sep 04 '17 at 06:19
What does `https://www.naver.com` return? It should be json not html — Davin Tryon, Sep 04 '17 at 07:23
i want xml data. but when i use XMLHttpRequest, the cors occurs. so i use jsonp.. how can i get the xml data using jsonp... — kekeee, Sep 04 '17 at 07:46

score -1 · Answer 1 · answered Sep 04 '17 at 06:40

-1

In your .babelrc file

 {
    "presets":[
        "react-app"
    ]
}

And then npm install --save-dev babel-preset-react-app

This is what create react app uses and is mostly updated to handle the latest syntax.

answered Sep 04 '17 at 06:40

Nitish Phanse

552
1
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That will not change the HTML document at `https://www.naver.com` into JSONP. It will still be HTML. – Quentin Dec 24 '19 at 11:34

Uncaught SyntaxError: Unexpected token <

1 Answers1