How to write to S3 with Node AWS Lambda function?

To write to S3 with Node AWS Lambda function, we use the putObject method.

For instance, we write

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

const putObjectToS3 = (bucket, key, data) => {
  const s3 = new AWS.S3();
  const params = {
    Bucket: bucket,
    Key: key,
    Body: data,
  };
  s3.putObject(params, (err, data) => {
    if (err) {
      console.log(err, err.stack);
    } else {
      console.log(data);
    }
  });
};

to call putObject to put the file at the Bucket with the Key.

Body has the file data.

And we get the file data from the data parameter in the callback.