Parsed CSV rows are coming through as Buffers instead of arrays when loading files from S3

I'm pulling multiple CSV files from S3. Each CSV contains several rows in this format:

45,ABC,800046,HJN,9000

The first column is the employee ID.
I want to loop through all the files, parse each CSV, and filter rows where the employee ID matches a given list (e.g., [118, 675]).

However, when I log the parsed rows, they are still coming through as a Buffer instead of arrays of CSV fields. Here is the relevant part of my code:

function filterCsvRows(allCsvBuffers, employeeIds) { let resultRows = []; for (const { key, buffer } of allCsvBuffers) { const csvText = buffer.toString("utf8"); const rows = parse(csvText, { columns: false, skip_empty_lines: true, trim: true, delimiter: ",", }); console.log("Parsed rows:", rows); // <-- This still logs Buffer } return resultRows; }

And I'm collecting the S3 objects like this:

const allCsvBuffers = []; for (const cont of Contents) { const key = cont.Key; const object = await getS3Object(bucketName, key); allCsvBuffers.push({ key, buffer: object.Body, }); } const filteredRows = filterCsvRows(allCsvBuffers, [118, 675]);

Why are the parsed rows still showing as Buffer instead of parsed CSV rows, and how can I correctly parse and filter them?