Create json and upload to s3 bucket using nodejs.

json-to-s3.js

var AWS = require('aws-sdk');
AWS.config.update({ region: 'us-east-1' });
var s3 = new AWS.S3();

var obj = {
    firstname: "Navjot",
    lastname: "Dhanawat"
};

var buf = Buffer.from(JSON.stringify(obj));

var data = {
    Bucket: 'bucket-name',
    Key: 'filename.json',
    Body: buf,
    ContentEncoding: 'base64',
    ContentType: 'application/json',
    ACL: 'public-read'
};

s3.upload(data, function (err, data) {
    if (err) {
        console.log(err);
        console.log('Error uploading data: ', data);
    } else {
        console.log('succesfully uploaded!!!');
    }
});

could you please give me advice, on the reason why we use Buffer.from to convert STRING to Buffer?

Basically, as I understand it, to transfer data across the internet (in this case, the content of a file) it needs to be represented as chunks of binary information that can be segmented and indexed while the transfer is undergoing. A simple string would not do the trick since its representation –while at a machine level can be read as binary– is not formatted correctly, I think it is technically just a pointer to a memory range where it is stored. The Buffer here actually creates –or rather, replicates– the binary information that represents the content of the string variable and makes it available as a variable itself.

thank you

Thanks brother