Uploading Files to AWS S3 using Nodejs

Uploading Files to AWS S3 using Nodejs

To install the dependencies for the AWS SDK for Node.js, you can use the npm package manager by running the following command in your terminal:

npm install aws-sdk

This will install the AWS SDK for Node.js and its dependencies in your project's node_modules directory.

Note: you will also need to configure your AWS credentials in your application, either by setting the AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY environment variables, or by using the config.update method of the SDK.

To upload an image to an Amazon S3 bucket using Node.js, you can use the AWS SDK for JavaScript in Node.js, also known as the aws-sdk package. Here's an example of how to use the aws-sdk package to upload an image to an S3 bucket:

const AWS = require('aws-sdk');

// Configure the AWS SDK with your S3 bucket's access key and secret key
  accessKeyId: 'AWS_ACCESS_KEY_ID',
  secretAccessKey: 'AWS_SECRET_ACCESS_KEY'

// Create an S3 client
const s3 = new AWS.S3();

// Read the image file from disk
const imageBuffer = fs.readFileSync('path/to/image.jpg');

// Configure the upload parameters
const params = {
  Bucket: 'your-bucket-name',
  Key: 'path/to/uploaded/image.jpg',
  Body: imageBuffer,
  ContentType: 'image/jpeg'

// Upload the image to the S3 bucket
s3.upload(params, (err, data) => {
  if (err) {
    console.error('Error uploading image to S3:', err);
  } else {
    console.log('Successfully uploaded image to S3:', data);

The above code first imports the aws-sdk package, then it configures the SDK with the access key and secret key of an IAM user that has the necessary permissions to upload to the S3 bucket. Then it creates an S3 client, reads an image file from the disk and creates an object with the necessary parameters for the upload such as the bucket name, the key of the file and the content type. It then uploads the image to the S3 bucket using the upload method of the S3 client.

Generate Signed URL

What is an AWS-Signed URL:

An AWS-signed URL is a way to give time-limited access to an Amazon S3 object through a URL, without requiring the user to have AWS credentials.

When you create a signed URL, you specify the object you want to give access to, and a set of parameters such as the expiration time for the URL, and the HTTP method (GET, PUT, etc.) that the user will be able to use with the URL.

Once the signed URL is created, you can share it with others, who will be able to access the object in S3 using the URL without the need for AWS credentials, and only within the specified time period and with the specified HTTP method.

Signed URLs can be useful for scenarios such as giving time-limited access to private objects in S3, or allowing users to upload files directly to S3 without the need for them to have AWS credentials.

To generate a signed URL for an object you can use getSignedUrl the method which generates a URL that can be used to download the object.

const url = s3.getSignedUrl('getObject', {
    Bucket: 'your-bucket-name',
    Key: 'path/to/uploaded/image.jpg',
    Expires: 60 // the URL will be valid for 60 seconds

Please make sure that the IAM user that you are using has the necessary permissions to upload and download from the S3 bucket.

I hope you found this post useful and please do let us know in case of any questions or queries.