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tus is a protocol based on HTTP for resumable file uploads. Resumable means that an upload can be interrupted at any moment and can be resumed without re-uploading the previous data again. An interruption may happen willingly, if the user wants to pause, or by accident in case of an network issue or server outage.

tus-js-client is a pure JavaScript client for the tus resumable upload protocol and can be used inside browsers, Node.js, React Native and Apache Cordova applications.

Protocol version: 1.0.0

This branch contains tus-js-client v4. If you are looking for the previous major release, after which breaking changes have been introduced, please look at the v3.1.3 tag.


input.addEventListener('change', function (e) {
  // Get the selected file from the input element
  var file =[0]

  // Create a new tus upload
  var upload = new tus.Upload(file, {
    endpoint: 'http://localhost:1080/files/',
    retryDelays: [0, 3000, 5000, 10000, 20000],
    metadata: {
      filetype: file.type,
    onError: function (error) {
      console.log('Failed because: ' + error)
    onProgress: function (bytesUploaded, bytesTotal) {
      var percentage = ((bytesUploaded / bytesTotal) * 100).toFixed(2)
      console.log(bytesUploaded, bytesTotal, percentage + '%')
    onSuccess: function () {
      console.log('Download %s from %s',, upload.url)

  // Check if there are any previous uploads to continue.
  upload.findPreviousUploads().then(function (previousUploads) {
    // Found previous uploads so we select the first one.
    if (previousUploads.length) {

    // Start the upload


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This project is licensed under the MIT license, see LICENSE.