How to use the AWS SDK for JavaScript V3 with B2 How to use the AWS SDK for JavaScript V3 with B2

How to use the AWS SDK for JavaScript V3 with B2

Pat Patterson Pat Patterson

B2 can easily be configured for use with the AWS SDK for JavaScript V3 thanks to the S3 Compatible API. Below is an example of a sample.js that creates a bucket and uploads a file:

import { S3Client, CreateBucketCommand, PutObjectCommand } from '@aws-sdk/client-s3';
import { v4 as uuid } from 'uuid';

// Create an S3 client
// You must copy the endpoint from your B2 bucket details
// and set the region to match.
const s3 = new S3Client({
endpoint: '',
region: 'us-west-004'

// Create a bucket and upload something into it
var bucketName = 'node-sdk-sample-' + uuid();
var keyName = 'hello_world.txt';

try {
await s3.send(new CreateBucketCommand({ Bucket: bucketName }));

await s3.send(new PutObjectCommand({
Bucket: bucketName,
Key: keyName,
Body: 'Hello World!'

console.log("Successfully uploaded data to " + bucketName + "/" + keyName);
} catch (err) {
console.log("Error: ", err);

Content of package.json:

"dependencies": {
"@aws-sdk/client-s3": "^3.32.0",
"uuid": "^9.0.0"
"type": "module"

Install the dependencies:

% npm install

added 106 packages, and audited 107 packages in 3s

found 0 vulnerabilities

The AWS SDK for JavaScript can read credentials from the shared credentials file, environment variables, and other mechanisms. See Setting Credentials in Node.js for details.

For example, to use the shared credentials file, you can add credentials to ~/.aws/credentials as a separate profile:

aws_access_key_id = your_b2_keyId
aws_secret_access_key = your_b2_appKey

Then run the script as follows.

% AWS_PROFILE=b2 node sample.js
Successfully uploaded data to node-sdk-sample-38cb5413-29c2-46f5-ab2d-4ac4d553f929/hello_world.txt

The S3 Compatible API for Backblaze B2 Cloud Storage allows 1000’s of integrations to work with B2 natively. If you’re new to the S3 Compatible API, please see our Getting Started Guide. If you have any trouble using the AWS SDK for JavaScript V3 with B2, please let us know by emailing us at