aws s3.listObjects recursive including metadata

gistfile1.js

const aws = require('aws-sdk')

aws.config.update({
    accessKeyId: process.env.aws_access_key_id, 
    secretAccessKey: process.env.aws_secret_access_key, 
    region: process.env.aws_region});
  
const options = {
    Bucket: process.env.s3_bucket,
    region: process.env.aws_region,
    signatureVersion: 'v4',
    ACL: 'public-read',
}

const s3 = new aws.S3(options)

function getS3ObjectHead(filename) {
    const params = {
      Bucket: process.env.s3_bucket,
      Key: filename,
    };
  
    return s3.headObject(params).promise();
}

//recursive function to list s3 objects
async function s3ListObjects(params, s3DataContents, includeHead) {
    try {
        const data = await s3.listObjects(params).promise()

        let contents = data.Contents;
        if (includeHead) {
            for (let i = 0; i < contents.length; i++) {
                let element = contents[i];
    
                const fileObject = await getS3ObjectHead(element.Key)
                element.head = fileObject
            }
        }

        s3DataContents = s3DataContents.concat(contents);
        if (data.IsTruncated) {
            // Set Marker to last returned key
            params.Marker = contents[contents.length-1].Key;
            await s3ListObjects(params, s3DataContents);
        } else {
            return s3DataContents;
        }
    } catch (error) {
        throw error
    }
}

// list all the files in a box
router.get('/list/:user/:box', async function (req, res) {
    const pathToFolder = `${req.params.user}/${req.params.box}/`

    const params = {
        Bucket: process.env.s3_bucket,
        Prefix: pathToFolder,
    };
    let s3DataContents = []; 

    try {
        const includeHead = true
        const data = await s3ListObjects(params, s3DataContents, includeHead)

        res.status(200).json({
            message: 'ok',
            data: data,
        });
    } catch (error) {
        res.status(500).json({
            message: error.message
        });
    }
});