Code snippet showing how to store a rendered image from ChartJS node library in an S3 bucket.

WriteFileToS3.js

const aws = require('aws-sdk');
const s3 = new aws.S3();

async function storeImage(buffer) {
  const imageFileName = "image.png";
  const object = {
      Bucket: BUCKET_NAME,
      Key: imageFileName,
      ACL: "public-read",
      Body: buffer
  };

  try {
    await s3.putObject(object).promise();
    return imageFileName;
  } catch(err) {
    console.error("Failed to store image: " + err);
    throw err;
  }
}