Installation
Run npm install image-mime
Use
<input type="file" id="file" />
<script src="image-mime.umd.cjs"></script>
<script>
document.getElementById("file").addEventListener('change', (event, x) => {
const fileReader = new FileReader();
fileReader.onloadend = (f) => {
const bytes = new Uint8Array(f.target.result);
console.log("Possible filetypes: ", imageMime(bytes))
}
fileReader.readAsArrayBuffer(event.target.files[0])
})
</script>