I am pulling down objects from s3. the objects are zipped, and I need to be able to unzip them and compare the contents with some strings. My problem is that I can't seem to get them properly unzipped. This is what I am seeing happen: s3 zipped -> over the wire -> to me as JS Buffer -> ???

I am unsure of what I can do next. I have seemingly tried everything, such as pako, and lzutf8 to decompress the strings, but no dice.

here is an attempt with lzutf8:

lzutf8.decompress(buffer,{outputEncoding: "String"}, (result, error) => {
    if (err) console.log(err);
    if (data) console.log(data);
});

Here is an attempt with pako:

pako.ungzip(buffer,{to: "string"}, (result, error) => {
    if (error) console.log(err);
    if (result) console.log(data);
})

pako throws an "incorrect header check", and lzutf8 silently does nothing.

I am not married to these libraries, so if there is anything else that will do the job, I am happy to try anything. I am guessing that my problem might have something to do with the encoding types? Not sure though.

Here is what the relevant part of my code looks like:

let pako = require('pako');
let streamBuffers = require('stream-buffers');


let ws = fs.createWriteStream(process.cwd() + 'path-to-file');
let rs = new streamBuffers.ReadableStreamBuffer();
objects.forEach((obj) => {
    console.log(obj);
    rs.on("data", (data) => {
        ws.write(pako.ungzip);
    })
    rs.push(obj);
})