Generate presigned url s3 nodejs 16.x (aws lambda & express js controller)

index.js

## This code example is optimized for Node 16.x runtime.
## Don't forget to add AWS_REGION and BUCKET_NAME as env variables in Lambda Configuration. 
## Give the Lambda required permission to edit the Bucket. 

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

AWS.config.update({ region: process.env.AWS_REGION });
const s3 = new AWS.S3({
    signatureVersion: "v4",
});

// config
const EXPIRATION_DURATION=3000;
const BUCKET=process.env.BUCKET_NAME;

// handler
exports.handler = async (event) => {
    const {filename} = event.body;
    let url  = `Data/images/${filename}`;
    
    const s3Params = {
        Bucket: BUCKET,
        Key: url,
        Expires: EXPIRATION_DURATION,
        ContentType: 'multipart/form-data',
    };

    const uploadURL = await s3.getSignedUrlPromise('putObject', s3Params);
    
    const response = {
            url: uploadURL
    };
    
    return response;
};

uploadController.js

## Generate presigned url s3 for Node 16.x (express js controller)
## Your aws access keys should have s3 putItem permission allowed for it to work

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

// store these configs in a separate file
const awsConfig = {
    region: process.env.AWS_REGION,
    s3: {
        endpoint: process.env.S3_BUCKET_ENDPOINT,
        region: process.env.AWS_REGION,
        accessKeyId: process.env.ACCESS_KEY,
        secretAccessKey: process.env.SECRET_ACCESS_KEY,
        bucket: process.env.S3_BUCKET_NAME,
        signatureVersion: "v4", // important (if not set, you'll receive signature unmatched error)
    },
};

// s3 config
const s3 = new AWS.S3({
    endpoint: awsConfig.s3.endpoint,
    accessKeyId: awsConfig.s3.accessKeyId,
    secretAccessKey: awsConfig.s3.secretAccessKey,
    Bucket: awsConfig.s3.bucket,
    signatureVersion: awsConfig.s3.signatureVersion,
    region: awsConfig.s3.region,
});

class UploadController {
    async getPresignedUrl(req, res) {
        const { filename, type, productId } = req.body;
        console.log(type);
        let url = `temp/${filename}`;

        if (productId) {
            url = `products/${productId}/${filename}`;
        }

        const s3Params = {
            Bucket: awsConfig.s3.bucket,
            Key: url,
            Expires: 3000,
            ContentType: "multipart/form-data",
        };
        const uploadURL = await s3.getSignedUrlPromise("putObject", s3Params);

        return res.status(200).json({status: 1, msg: "success", data: {url: uploadURL});
    }
}

export default new UploadController();