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Awesome Open Source


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STATUS: Unmaintained

I am currently unable to give this project much attention. I won't be addressing issues or creating new versions for the forseeable future. Feel free to fork this project and hack away though!

A Vue.js drag & drop uploader based on Dropzone.js (~22KB, ~6.5KB gzipped). Many thanks to Matias Meno for paving the way with the original Dropzone.js! Check it out for any of your non-vue projects. 🙌

Check out the CodeSandbox here:

Have a question? Check out the FAQ section.
Can't find what you're looking for? Open an issue.
Want to add to the docs? Submit a PR.

Table of Contents


To get the latest alpha build:

npm install [email protected]


Vue-Transmit is a fork of Dropzone.js that has been completely rewritten in TypeScript/ES6 for Vue.js. Instead of creating a Vue wrapper component that duplicates and proxies all of the methods and event logic between Dropzone and the component, Vue-Transmit implements them directly from the component. This cuts down on library size and offers a much tighter integration.

Vue-Transmit takes an event-based approach to the upload cycle. Instead of passing callbacks to the component via an options object, use the template event binding syntax (<vue-transmit @event="callback" />). All events strictly conform to kebab-casing, including events proxied off native events (e.g. dragover => @drag-over). This is for uniformity and so events can be easily distinguished.

Vue-Transmit also has a modular upload transport. The default transport implementation uses XMLHttpRequest to upload client-side files using multi-part form data, but this could be swapped for a custom implementation for something like Firebase or WebSockets.

In order to integrate with Vue.js reactivity, an object's properties must be defined initially, be enumerable, and be configurable. A special File class has been written (VTransmitFile) to register native browser file objects from uploads reactively, since the native object properties are read-only. This class also adds useful information not present in the native File object (dimensions, upload stats, etc.).

  • HTML 5 file uploads
  • Emits upload lifecycle events (accepted, sending, progress, success, etc.)
  • Image thumbnail previews
  • Support for concurrent uploads
  • Modular upload transport layer
  • Completely written in Vue.js—no wrapper components
  • Scoped slots allow for fully customizable styling
  • Written in modern TypeScript/ES6 with modules

* Note: this library uses some built-ins (Array.from, Promise) that require a polyfill. All other ESNext language features (arrow fns, for of, etc.) are transpiled with TypeScript.



Visit the 8.x branch here.

Version 9 of Vue Transmit marks a new design that introduces various breaking changes. Migrating an existing app to >=v9.x.x should be roughly hour of work for most use cases (mileage may vary), but if you're using v8.x.x and you don't need any v9 features, there's no need to update. An 8.x branch will be maintained for LTS* support.

* LTS support === patches only.


# npm
npm install vue-transmit

# yarn
yarn add vue-transmit


The default build for ESM loaders like webpack is indicated in the module field of the package, while non-esm will resolve from the main field. By default, the unminified versions are specified. For most setups, importing the lib would like either of the following:

// ESM default export
import VueTransmit from "vue-transmit";
// ESM named export
import { VueTransmitPlugin } from "vue-transmit";
// Common.js (no 'default' export)
const { VueTransmitPlugin } = require("vue-transmit");
// Browser
const { VueTransmitPlugin } = window.VueTransmit;

// Installation

If you don't wish to register VueTransmit as a global component, you can import the component directly.

// ESM
import { VueTransmit } from "vue-transmit";
// Common.js
const { VueTransmit } = require("vue-transmit");
// Browser
const { VueTransmit } = window.VueTransmit;

// Your component using VueTransmit
const MyComponent = Vue.extend({
	name: "my-component",
	components: {
		"vue-transmit": VueTransmit,
Target Path Minified
ESM vue-transmit/dist/vue-transmit.esm.js false
ESM vue-transmit/dist/vue-transmit.esm.min.js true
UMD vue-transmit/dist/vue-transmit.js false
UMD vue-transmit/dist/vue-transmit.min.js true
└── dist
    ├── index.d.ts
    ├── vue-transmit.css
    ├── vue-transmit.esm.js
    ├── vue-transmit.esm.min.js
    ├── vue-transmit.js
    ├── vue-transmit.min.js

Props: <vue-transmit>

View Source

Property Type Default/Function Signature
tag string "div"
uploadAreaClasses array, object, string null
uploadAreaAttrs object {}
uploadAreaListeners object {}
dragClass string null
maxConcurrentUploads number 2
uploadMultiple boolean false
maxFileSize number 256
fileSizeBaseInBinary boolean false
createImageThumbnails boolean true
maxThumbnailFileSize number 10
thumbnailWidth number 120
thumbnailHeight number 120
maxFiles number null
clickable boolean true
ignoreHiddenFiles boolean true
acceptedFileTypes array []
autoProcessQueue boolean true
autoQueue boolean true
capture string null
errMaxFileSizeExceeded function (fileSize: number, maxFileSize: number, units: string) => string
errInvalidFileType function (type: string, acceptedTypes: string[], file: VTransmitFile) => string
errMaxFilesExceeded function (maxFiles: number) => string
accept function (file: VTransmitFile, done: Function) => string
resize function (file: VTransmitFile, dims: { width: number; height: number; }) => { sx: number; sy: number; sWidth: number; sHeight: number; dx: number; dy: number; dWidth: number; dHeight: number; }
adapterOptions object {}
uploadAdapter function XHRUploadAdapter

Adapter Options: XHRUploadAdapter

View Source

Property Type Default/Function Signature
url string (required)
method string "post"
withCredentials boolean false
timeout number 0
paramName string "file"
params { [key: string]: string } {}
headers { [key: string]: string } { Accept, 'Cache-Control', 'X-Requested-With' }
responseType "" | "arraybuffer" | "blob" | "document" | "json" | "text" "json"
errUploadError function (xhr: XMLHttpRequest) => string
errUploadTimeout function (xhr: XMLHttpRequest) => string
renameFile function (name: string) => string
responseParseFunc function <T>(xhr: XMLHttpRequest) => T


Event Arguments Description
drop event: DragEvent The drop event is fired when an data transfer is dropped on the drop target.
drag-start event: DragEvent The drag-start event is fired when the user starts dragging an element or text selection.
drag-end event: DragEvent The drag-end event is fired when a drag operation is being ended (by releasing a mouse button or hitting the escape key).
drag-enter event: DragEvent The drag-enter event is fired when a dragged element or text selection enters a valid drop target.
drag-over event: DragEvent The drag-over event is fired when an element or text selection is being dragged over a valid drop target (every few hundred milliseconds).
drag-leave event: DragEvent The drag-leave event is fired when a dragged element or text selection leaves a valid drop target.
added-file file: VTransmitFile Fired on change from the hidden file input after the Native File has been copied to file: VTransmitFile and added to the component data. (status: 'added')
added-files files: VTransmitFile[] Fired on change from the hidden file input after the Native Files have been copied to VTransmitFiles and added to the component data. (status: 'added')
accepted-file file: VTransmitFile Fired if the user-supplied accept function returns without error. (status: 'added', accepted: true)
rejected-file file: VTransmitFile Fired if the user-supplied accept function returns an error. Fired AFTER the error event to ensure correct file status. (status: 'error', accepted: false)
accept-complete file: VTransmitFile Fired after the user-supplied accept function has returned regardless of success/failure. Fired after accepted-file & rejected-file. (status: ?, accepted: ?)
removed-file file: VTransmitFile Fired on the removal of a file.
thumbnail file: VTransmitFile, data: Blob|URL Fires on creation of a thumbnail.
error file: VTransmitFile, message: string, data: any Fired on an ajax upload error. (status: 'error')
error-multiple files: VTransmitFile[], message: string, data: any Fired on an ajax upload error. (status: 'error')
processing file: VTransmitFile Fired after the status is changed to 'uploading', right before the ajax request.
processing-multiple files: VTransmitFile[] Fired after the status is changed to 'uploading', right before the ajax request.
upload-progress file: VTransmitFile, progress: number, bytesSent: number Fired on progress of the upload.
total-upload-progress file: VTransmitFile, totalUploadProgress: number Fired directly after upload-progress.
sending file: VTransmitFile, xhr: XMLHttpRequest, data: FormData Fired right before the upload is sent.
sending-multiple files: VTransmitFile[], xhr: XMLHttpRequest, FormData Fired right before the upload is sent.
success file: VTransmitFile, result: any Fired on load of the upload.
success-multiple files: VTransmitFile[], result: any Fired on load of the upload.
timeout file: VTransmitFile, message: string, data: any Fired on timeout of the upload.
timeout-multiple files: VTransmitFile[], message: string, data: any Fired on timeout of the upload.
canceled file: VTransmitFile Fired upon cancellation of the upload. (status: 'canceled')
canceled-multiple files: VTransmitFile[] Fired upon cancellation of the upload. (status: 'canceled')
complete file: VTransmitFile Fired upon completion of the upload. (whether success or failure)
complete-multiple files: VTransmitFile[] Fired upon completion of the upload. (whether success or failure)
reset void Fired when all files have been removed.
max-files-exceeded file: VTransmitFile Fired if a file is added that exceeds the max files prop.
max-files-reached files: VTransmitFile[] Fired when the total accepted files on the instance exceeds the max files prop.
queue-complete file: VTransmitFile Fired once all added files have uploaded and the queue has been flushed.

File Statuses

VTransmitFiles have a status property used to indicate its place in the upload cycle. Note that Accepted is an alias of Queued since the is the same place in the lifecycle (inherited from Dropzone lifecycle). This may change in a future version for more clarity. Also note that Rejected is not a status. Accepted/rejected is derived from the file.accepted boolean property.

enum UploadStatuses {
	None = "",
	Added = "added",
	Queued = "queued",
	Accepted = "queued",
	Uploading = "uploading",
	Canceled = "canceled",
	Error = "error",
	Timeout = "timeout",
	Success = "success",


Default ($slots.default)

The default slot should contain your markup for getting an upload started. This could be a file uploader button and/or a dropzone.

Files (Scoped, $slots.files)

This slot receives a number of props:

interface FilesSlotProps {
	files: VTransmitFile[];
	acceptedFiles: VTransmitFile[];
	rejectedFiles: VTransmitFile[];
	addedFiles: VTransmitFile[];
	queuedFiles: VTransmitFile[];
	uploadingFiles: VTransmitFile[];
	canceledFiles: VTransmitFile[];
	failedFiles: VTransmitFile[];
	timeoutFiles: VTransmitFile[];
	successfulFiles: VTransmitFile[];
	activeFiles: VTransmitFile[];
	isUploading: boolean;


	"_nativeFile": {},
	"id": "v-transmit-file-1",
	"accepted": true,
	"lastModified": 1478117443000,
	"lastModifiedDate": "2016-11-02T20:10:43.000Z",
	"name": "cosmo.jpg",
	"processing": true,
	"size": 142776,
	"status": "success",
	"type": "image/jpeg",
	"upload": {
		"bytesSent": 142776,
		"progress": 100,
		"speed": {
			"kbps": 10.06,
			"mbps": 0.01
		"start": 1503273157993,
		"end": 1503273158029,
		"time": 0.036,
		"total": 142776
	"webkitRelativePath": "",
	"width": 700,
	"height": 700,
	"xhr": {},
	"dataUrl": "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAHgAAAB4CAYAAAA5ZDbSAAAgAElEQVR4XlS9B7RmZ3UluG/="


If you have PHP installed on your machine, you can clone this repo and open up a working test app by running:

npm test

Now navigate to http://localhost:3030/.

	<main id="root" class="mt-5">
		<div class="container">
			<div class="row">
				<header class="col-12 text-center">
					<h1 class="mb-5"><code>&lt;vue-transmit&gt;</code></h1>
						class="d-flex align-items-center justify-content-center w-100"
						style="height:50vh; border-radius: 1rem;"
						<button class="btn btn-primary" @click="triggerBrowse">
							Upload Files
					<!-- Scoped slot -->
					<template slot="files" slot-scope="props">
							v-for="(file, i) in props.files"
							:class="{'mt-5': i === 0}"
							<div class="media">
									class="img-fluid d-flex mr-3"
								<div class="media-body">
									<h3>{{ }}</h3>
									<div class="progress" style="width: 50vw;">
											class="progress-bar bg-success"
											:style="{width: file.upload.progress + '%'}"
									<pre>{{ file | json }} </pre>

	Vue.use(VueTransmit); = new Vue({
		el: "#root",
		data: {
			options: {
				acceptedFileTypes: ["image/*"],
				clickable: false,
				adapterOptions: {
					url: "./upload.php",
		methods: {
			triggerBrowse() {
		filters: {
			json(value) {
				return JSON.stringify(value, null, 2);


I don't see the dropzone

Default styles are extracted into a separate .css file and are entirely optional. If you are using Vue single-file components, you can include it via the <style> section:

@import "~vue-transmit/dist/vue-transmit.css";

Alternatively, you can style the dropzone using your own classes using the uploadAreaClasses and dragClass props.

How to add a button or text to the dropzone

Vue Transmit doesn't add any markup for your dropzone target by default. Instead, it makes a default slot available for you to provide markup custom to your use-case. Any content you put between the opening and closing <vue-transmit> tags will be rendered inside the drop zone.

	<h3 class="text-center">Drop file here or click to upload.</h3>

Accessing the VueTransmit component instance

It's always recommended to place a ref on your vue-transmit instance so that your component can call methods and retrieve data directly from the instance.

<vue-transmit ref="vtransmit" />

How to remove a file

You can remove a single file or all files from the component instance. To remove a single file, you'll need the file you wish to delete.

// from your component
this.$refs.vtransmit.removeFile(vtFile); // single file
this.$refs.vtransmit.removeAllFiles((cancelInProgressUploads = false)); // all files


The upload process has many stages, each with different possible outcomes. Here is an overview of the lifecycle of an upload with Vue Transmit:

  • Trigger event
    • input on change: value of input.files is read and passed to vm.addFile
    • target on drop: value of event.dataTransfer["files" || "items"] is read/traversed and passed to vm.addFile
  • Add File
    • instantiate VTransmitFile from native file object (for reactivity & extra info)
    • status added
    • pushed onto vm.files
    • thumbnail is enqueued
  • Accept File
    • check size, type, upload limit
    • invoke accept function for consumer validation
    • accept or reject complete
    • if autoQueue, enqueue file
  • Enqueue file
    • check that file status is added & has been accepted
    • status = queued
    • if autoProcessQueue, invoke processQueue async (like node setImmediate)
  • Process queue
    • check number of uploading files against upload limit
    • invoke processFiles with max amount of queued files options allow
  • Process files
    • do upload
  • Progress updates
  • Complete upload
    • status = success || error
    • process queue to handle buffered files

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