Build File Upload/Download Functionality with Image Preview

Introduction

In this article, we will create a file upload and download functionality with a preview of the image using the MERN stack.

By creating this App, you will learn

• How to upload a file using drag and drop
• How to upload and download any type of file
• How to restrict the type of the file while uploading
• How to restrict the size of the file while uploading
• How to show a preview of the image after selecting it
• How to use MongoDB to store and get the details of the file

and much more.

Instead of storing the file in the MongoDB database as base64 encoded, we will be storing the file on the server and only storing the path of the file inside the database so as to keep the database size smaller and to easily access and move the files as per the need.

We’re using a very popular react-dropzone npm library for implementing the drag and drop functionality.

For actual file upload, we’re using multer npm library which is also very popular for uploading files.

We will be using React Hooks for building this application, so If you’re not familiar with it, check out my previous article here for the introduction to Hooks.

We will be using the MongoDB database so make sure you install it locally by following my previous article here

Initial Setup

Create a new project using create-react-app

create-react-app react-upload-download-files

Once the project is created, delete all files from the src folder and create index.js and styles.scss files inside the src folder. Also, create components, router and utils folders inside the src folder.

Install the necessary dependencies:

yarn add axios@0.20.0 bootstrap@4.5.2 downloadjs@1.4.7 node-sass@4.14.1 react-bootstrap@1.3.0 react-dropzone@11.2.0 react-router-dom@5.2.0

Open styles.scss and add the contents from here inside it.

#web-development #programming #nodejs #javascript #react #react native

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