File.type

Returns the media type (MIME) of the file represented by a File object.

Syntax

var name = file.type;

Value

A string, containing the media type(MIME) indicating what type of the file is it for example "image/png" for PNG images

Example

<input type="file" multiple onchange="showType(this)">

function showType(fileInput) {
  var files = fileInput.files;

  for (var i = 0; i < files.length; i++) {
    var name = files[i].name;
    var type = files[i].type;
    alert("Filename: " + name + " , Type: " + type);
  }
}

Note: Based on the current implementation, browsers won't actually read the bytestream of a file to determine its media type. It is assumed based on the file extension; a PNG image file renamed to .txt would give "text/plain" and not "image/png". Moreover, file.type is only reliable for common file types like images, documents audio and video. Uncommon file extensions would return an empty string. Developers are advised not to rely on this property as a sole validation scheme.

Specifications

Browser compatibility

[1] WebKit bug 32912

See also

• Using files from web applications