File.type

Summary

The type property of a Blob object provides the MIME type of the file. It returns an empty string if the type couldn't determined.

Syntax

var mimetype = instanceOfFile.type

Value

A string

Example

// fileInput is a HTMLInputElement: 
var fileInput = document.getElementById("myfileinput");

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

// our application only allows *.png, *.jpeg and *.gif images
var allowedFileTypes = ["image/png", "image/jpeg", "image/gif"];

files.forEach( function (file) {
  // Test if file.type is an allowed file type.
  if (allowedFileTypes.indexOf(file.type) > -1) {
    // file type matched is one of allowed file types. Do something here.
  }
});

Specifications

Browser compatibility

See also

• Blob