Vue Upload Images in no time using Dropzone.js

I this guide, I want to show you how to build an amazing Drag&Drop component, to upload one or multiple images in vue.js. We will use a library called dropzone.js from where you can easily upload images to nearly everywhere.
CategoriesvueComponentsawesome libariesupload imagesvue images
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In my first guide, I want to show you how to build a Drag&Drop inside your Vue.js application. This is the first part in the series on how to securely upload your files to an S3 Bucket from vue.Js.

For uploading the images we are going to use vue-dropzone, and to make the upload process more secure. The images will at first be uploaded to a .net Core API, from there it will be streamed to your S3 Bucket.

This will improve the overall security of your application and your AWS account since your sensitive login info is not saved inside your frontend where it could be easily exploited. Instead, it is saved in your backend application where an attacker could not access it.

To provide you a better overview this article will be split into four sections.

In Section One, I will describe how to set up the UI.

In the second section, you will learn everything you need to know about creating your S3 Bucket and saving the images into it.

Section three will all about handling the images inside that backend and forwarding them to your S3 Bucket.

You can skip this if you want to use another server technology.

In the last section, I will tell you how to access your images in a fast way.

The Images are going to be uploaded using dropzone.js, this is an amazing js library providing feature-rich drag&drop functionality with upload status, etc. in no time.

Install and setup Dropzone.js

I will use the vue wrapper of dropzone, called vue-Dropzone vue-Dropzone.

First of all, we are adding dropzone to our project.

    npm install vue2-dropzone

After the installation, you have full access to the dropzone.js functionality and it could be imported like any other vue-component.

Setting up dropzone.js

Next, we will set up the dropzone component, this should look something like this:

If The Image was uploaded successfully, it will be displayed like on the left, with the image name on Huver.

Since we do not allow duplicated images on our S3 Bucket, adding the same Image twice will lead to an error (right), the image will be marked and on hover, the error message will be displayed.

        {{ label }}
    import ImageRepository from "../../Repository/ImageRepository";
    import "vue2-dropzone/dist/vue2Dropzone.min.css";
    import vueDropzone from "vue2-dropzone";
    export default {
      name: "dropZone",
      components: { vueDropzone },
      props: {
        label: {
          type: String
        location: { type: String, required: true }
      data() {
        return {
          selectedImages: [],
          files: new FormData(),
          baseURL: "youApiUrl",
          dropOptions: {
            url: baseURL + "yourEndpoint",
            addRemoveLinks: true,
            maxFilesize: 3,
            accept: function(file, done) {
              if (
                file.type.toLowerCase() != "image/jpg" &&
                file.type.toLowerCase() != "image/gif" &&
                file.type.toLowerCase() != "image/jpeg" &&
                file.type.toLowerCase() != "image/png"
              ) {
                done("Invalid file");
              } else {
            headers: {
              "Cache-Control": null,
              "X-Requested-With": null,
              withCredentials: true
      methods: {
        appendLocation(file, xhr, formData) {
          formData.append("path", this.location);
        handleResponse(file, response) {
          var Image = {
            key: response.key,
            imageId: parseInt(,
            bucket: this.location
          this.$emit("input", this.selectedImages);

In the above code, we first import the dropzone component and display a label given as a prop above it.

The options passed to the component are defined in the dropOptions object.

With this options set, our component will send a formData Object to the given URL, got remove links to delete uploaded images again. The accept property could be used to define the accepted file types via this filter function, with maxFileSize we are not accepting files bigger than 3MB. The headers are set according to the needs of the API.

You can also intercept Dropzone at different stages and execute additional code. For example, I'm appending the location where the image should be saved to the request, by simply listening to the @vdropzone-sending event. Again you can find the whole list of supported events in the dropzone.js documentation.

Before uploading your images, make sure to compress them. I could recommend

This was the first part of my series on how to securely upload anything to Amazon S3. In the next part, I'm going to explain how to set up an Amazon S3 Bucket to store the images in.

I hope I could help you and save you some time, if you got feedback just contact me in the say hi section. If I could help you, you can support me by buying me a coffee.

Happy coding,


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