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Today, with some awesome serverless cloud solutions like AWS and Firebase, uploading a file has become a piece of cake.

Today we will see how we can quickly create an S3 bucket and upload files directly from our front-end React application.

Pre Requisites

An AWS Account
Basic Understanding of ReactJS

Let’s get started!

Step 1. Create S3 Bucket

Then give it a name and select the proper region. Then uncheck the Block all public access just for now (You have to keep it unchecked in production).

Hit Create Bucket and you will see your new bucket on the list.

Step 2. Edit Bucket Policy

Now we will set the bucket policy. Click on the bucket name and go to the properties tab.

Scroll down a bit, and you will see a section named Bucket Policy

Click on the Edit button. and add the following json.

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "PublicListGet",
            "Effect": "Allow",
            "Principal": "*",
            "Action": [
                "s3:List*",
                "s3:Get*"
            ],
            "Resource": [
                "arn:aws:s3:::BUCKET_NAME",
                "arn:aws:s3:::BUCKET_NAME/*"
            ]
        }
    ]
}

This will allow public access to the folder's content for now.

Step 3. Edit CORS Policy

Scroll down a bit further, and you will get a section where you can edit the CORS policy. As we will be uploading files from another endpoint, we need to ensure that our bucket does not block that for cors

Then add the following .json file to the policy

[
    {
        "AllowedHeaders": [
            "*"
        ],
        "AllowedMethods": [
            "PUT",
            "POST",
            "DELETE",
            "GET"
        ],
        "AllowedOrigins": [
            "*"
        ],
        "ExposeHeaders": []
    }
]

Now we are ready to upload files to our AWS S3 bucket. Now moving on with the frontend part.

Step 4. Set Up React Project

To follow along, you will need a basic React project setup. You can do it easily by

npx create-react-app s3-upload

It will scaffold a basic application for you.

Step 5. Upload File Via Native SDK

If we use other aws services in our project, then we have a special npm package for that named aws-sdk. We can get it by

yarn add aws-sdk

Then create a new component named UploadImageToS3WithNativeSdk and add the following code there

import React ,{useState} from 'react';
import AWS from 'aws-sdk'

const S3_BUCKET ='YOUR_BUCKET_NAME_HERE';
const REGION ='YOUR_DESIRED_REGION_HERE';


AWS.config.update({
    accessKeyId: 'YOUR_ACCESS_KEY_HERE',
    secretAccessKey: 'YOUR_SECRET_ACCESS_KEY_HERE'
})

const myBucket = new AWS.S3({
    params: { Bucket: S3_BUCKET},
    region: REGION,
})

const UploadImageToS3WithNativeSdk = () => {

    const [progress , setProgress] = useState(0);
    const [selectedFile, setSelectedFile] = useState(null);

    const handleFileInput = (e) => {
        setSelectedFile(e.target.files[0]);
    }

    const uploadFile = (file) => {

        const params = {
            ACL: 'public-read',
            Body: file,
            Bucket: S3_BUCKET,
            Key: file.name
        };

        myBucket.putObject(params)
            .on('httpUploadProgress', (evt) => {
                setProgress(Math.round((evt.loaded / evt.total) * 100))
            })
            .send((err) => {
                if (err) console.log(err)
            })
    }


    return <div>
        <div>Native SDK File Upload Progress is {progress}%</div>
        <input type="file" onChange={handleFileInput}/>
        <button onClick={() => uploadFile(selectedFile)}> Upload to S3</button>
    </div>
}

export default UploadImageToS3WithNativeSdk;

Here is a simple component where there is a file input and upload the file using native aws-sdk

Replace BUCKET_NAME , REGION_NAME, SECRET_KEY, ACCESS_KEY with your own value

Step 6. Upload File Via React S3

If you are not using other AWS services, then you don’t need the full aws-sdk which will unnecessarily increase your bundle size.

We will use another library named react-s3. First, install it

yarn add react-s3

Then create a new component named UploadImageToS3WithReactS3 and add the following code

import React , {useState} from 'react';
import { uploadFile } from 'react-s3';


const S3_BUCKET ='YOUR_BUCKET_NAME';
const REGION ='YOUR_REGION_NAME';
const ACCESS_KEY ='YOUR_ACCESS_KEY';
const SECRET_ACCESS_KEY ='YOUR_SECRET_ACCESS_KEY';

const config = {
    bucketName: S3_BUCKET,
    region: REGION,
    accessKeyId: ACCESS_KEY,
    secretAccessKey: SECRET_ACCESS_KEY,
}

const UploadImageToS3WithReactS3 = () => {

    const [selectedFile, setSelectedFile] = useState(null);

    const handleFileInput = (e) => {
        setSelectedFile(e.target.files[0]);
    }

    const handleUpload = async (file) => {
        uploadFile(file, config)
            .then(data => console.log(data))
            .catch(err => console.error(err))
    }

    return <div>
        <div>React S3 File Upload</div>
        <input type="file" onChange={handleFileInput}/>
        <button onClick={() => handleUpload(selectedFile)}> Upload to S3</button>
    </div>
}

export default UploadImageToS3WithReactS3;

This component will do the same as the previous component. It will take a file as input and upload it to the S3 bucket.

And also, don’t forget to change the parameter values.

Conclusion

And there you go! Here is how you can upload any file to an s3 bucket. Explore the documentation for more customization according to your need.

Have a great day! :D

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How to Upload Files to AWS S3 in React