How to Create Drag and Drop Upload in ReactJS and Upload Files to Backend: A Step-by-Step Guide

Sandeep Singh (Full Stack Dev.)
4 min readJun 19, 2023
How to create drag and drop to upload in react.js
How to create drag and drop to upload in react.js

Introduction

In this article, we will explore how to implement drag and drop file upload functionality in a ReactJS application using the popular library called React-Dropzone.

We will guide you through the process of setting up the necessary components, handling file uploads, and sending the files to the backend server.

By the end of this tutorial, you will have a clear understanding of how to create a seamless drag and drop file upload feature in your ReactJS projects.

Table of Contents

  1. Prerequisites
  2. Setting Up a ReactJS Project
  3. Installing React-Dropzone
  4. Creating the FileUpload Component
  5. Implementing Drag and Drop Functionality
  6. Handling File Uploads
  7. Uploading Files to the Backend
  8. Conclusion
  9. FAQs

1. Prerequisites

Before we begin, make sure you have the following prerequisites in place:

  • Basic knowledge of ReactJS
  • Node.js and npm installed on your machine
  • An understanding of backend technologies (e.g., Node.js, Express, etc.)

2. Setting Up a ReactJS Project

To create a new ReactJS project, you can use the Create React App command-line tool. Open your terminal and execute the following command:

npx create-react-app drag-and-drop-upload

Once the project is created, navigate into the project directory:

cd drag-and-drop-upload

3. Installing React-Dropzone

React-Dropzone is a simple and customizable component for handling file uploads in ReactJS applications. Install it by running the following command in your terminal:

npm install react-dropzone

4. Creating the FileUpload Component

In this step, we will create a new component called FileUpload that will handle the file upload functionality. Inside the “src” directory of your project, create a new file called “FileUpload.js” and open it in your preferred code editor.

import React from 'react';
import { useDropzone } from 'react-dropzone';
const FileUpload = () => {
const { getRootProps, getInputProps } = useDropzone();
return (
<div {...getRootProps()}>
<input {...getInputProps()} />
<p>Drag and drop files here or click to browse.</p>
</div>
);
};
export default FileUpload;

5. Implementing Drag and Drop Functionality

To enable drag and drop functionality, we need to make some modifications to the FileUpload component. Update the component code as follows:

import React from 'react';
import { useDropzone } from 'react-dropzone';

const FileUpload = () => {
const { getRootProps, getInputProps } = useDropzone();
return (
<div {...getRootProps()}>
<input {...getInputProps()} />
<p>Drag and drop files here or click to browse.</p>
<ul>
{acceptedFiles.map((file) => (
<li key={file.name}>{file.name}</li>
))}
</ul>
</div>
);
};
export default FileUpload;

6. Handling File Uploads

In this step, we will update the FileUpload component to handle file uploads and display the uploaded files. Modify the component code as follows:

import React, { useState } from 'react';
import { useDropzone } from 'react-dropzone';
const FileUpload = () => {
const [uploadedFiles, setUploadedFiles] = useState([]);
const { getRootProps, getInputProps } = useDropzone({
onDrop: (acceptedFiles) => {
setUploadedFiles(acceptedFiles);
},
});
//TO DO : Customize and Style this Drag and Drop to Upload box as you want🧑‍💻😊
return (
<div {...getRootProps()}>
<input {...getInputProps()} />
<p>Drag and drop files here or click to browse.</p>
<ul>
{uploadedFiles.map((file) => (
<li key={file.name}>{file.name}</li>
))}
</ul>
</div>
);
};
export default FileUpload;

7. Uploading Files to the Backend

To complete the file upload process, we need to send the uploaded files to the backend server. In this example, we assume you have a backend API endpoint to handle file uploads. Modify the FileUpload component as follows:

import React, { useState } from 'react';
import { useDropzone } from 'react-dropzone';
const FileUpload = () => {
const [uploadedFiles, setUploadedFiles] = useState([]);
const { getRootProps, getInputProps } = useDropzone({
onDrop: (acceptedFiles) => {
setUploadedFiles(acceptedFiles);
// Call your backend API endpoint to upload files
},
});
return (
<div {...getRootProps()}>
<input {...getInputProps()} />
<p>Drag and drop files here or click to browse.</p>
<ul>
{uploadedFiles.map((file) => (
<li key={file.name}>{file.name}</li>
))}
</ul>
</div>
);
};
export default FileUpload;

Note: I didn’t done styling of this drag and drop box, you can do your styling which you want at your own. this box is very easy to style, just like styling normal elements with CSS

8. Conclusion

Congratulations! You have successfully implemented drag and drop file upload functionality in your ReactJS application using React-Dropzone. Now you can allow users to easily upload files by dragging and dropping them onto the designated area.

Remember to customize the FileUpload component according to your specific requirements. You can add validation, progress bars, and error handling based on your project needs.

Also Read:

FAQs

1. Can I use React-Dropzone with other frontend frameworks?

Yes, React-Dropzone is designed to work with ReactJS, but you may need to adapt it for other frontend frameworks.

2. How can I limit the file types and sizes that users can upload?

You can customize the behavior of React-Dropzone by setting accepted file types and maximum file size limits using the accept and maxSize props.

3. Does React-Dropzone support multiple file uploads?

Yes, React-Dropzone supports uploading multiple files at once. The onDrop callback provides an array of accepted files that you can process accordingly.

4. How can I style the drag and drop area?

You can apply your custom CSS styles to the FileUpload component to match your project’s design requirements. React-Dropzone provides various CSS classes and elements that you can target.

5. What backend technologies can I use to handle file uploads?

You can use any backend technology of your choice, such as Node.js, PHP, Ruby on Rails, etc., to handle file uploads. The implementation details may vary depending on the backend technology you select.

--

--

Sandeep Singh (Full Stack Dev.)

Fullstack Developer | MERN & Flutter | Passionate about Open Source | Engaged in Contributing & Collaborating for a Better Tech Community. 🚀