How to find MIME type of IPFS (no extension given) using Javascript?

Question

If I have an IPFS CID address (with no extension), of a file like this for instance https://ipfs.infura.io/ipfs/QmNhq4hx1KfTw1a5pTtudGXm9Q4xhWdeuWtPSSG19SSZeU , how can I find its MIME type using Javascript?

I've tried the following:

let file='https://ipfs.infura.io/ipfs/QmNhq4hx1KfTw1a5pTtudGXm9Q4xhWdeuWtPSSG19SSZeU'
if (window.FileReader && window.Blob) {
    console.log("All the File APIs are supported by the browser.");
    console.log("Type: " + file.type);
} else {
    console.log("File and Blob are not supported by the browser");
}

This is always giving me undefined. Any help would be much appreciated.

stackoverflow.com/a/29672957/6702203

user6702203
– user6702203

2022-04-27 15:42:44 +00:00
Commented Apr 27, 2022 at 15:42 — user6702203
– user6702203, Commented Apr 27, 2022 at 15:42

Musa · Accepted Answer · 2022-05-09 18:41:39Z

1

You have a url, so to get the mime type you can make a HTTP HEAD request.

(async function(){ 
let file='https://ipfs.infura.io/ipfs/QmNhq4hx1KfTw1a5pTtudGXm9Q4xhWdeuWtPSSG19SSZeU';
var req = await fetch(file, {method:'HEAD'});
console.log(req.headers.get('content-type'));
})()

answered May 9, 2022 at 18:41

Musa

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1 Comment

kumar ujjawal Over a year ago

Not got mime type after passing { mode: 'no-cors' } on place of {method:'HEAD'}.

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