Web/API/Blob/type

The type property of a Blob object returns the MIME type of the file.

Syntax

var mimetype = blob.type

Value

A DOMString containing the file's MIME type, or an empty string if the type could not be determined.

Example

This example asks the user to select a number of files, then checks each file to make sure it's one of a given set of image file types.

var i, fileInput, files, allowedFileTypes;

// fileInput is a HTMLInputElement: <input type="file" multiple id="myfileinput">
fileInput = document.getElementById("myfileinput");

// files is a FileList object (simliar to NodeList)
files = fileInput.files;

// our application only allows GIF, PNG, and JPEG images
allowedFileTypes = ["image/png", "image/jpeg", "image/gif"];

for (i = 0; i < files.length; i++) {
  // Test if file.type is an allowed file type.
  if (allowedFileTypes.indexOf(files[i].type) > -1) {
    // file type matched is one of allowed file types. Do something here.
  }
});

Specifications

Specification	Status	Comment
File APIThe definition of 'Blob.type' in that specification.	Working Draft	Initial definition.

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`type`	Chrome Full support 5	Edge Full support 12	Firefox Full support 4	IE Full support 10	Opera Full support 11	Safari Full support 5.1	WebView Android No support No	Chrome Android Full support 18	Firefox Android No support No	Opera Android No support No	Safari iOS No support No	Samsung Internet Android Full support 1.0

Legend

Full support: Full support
No support: No support