so.SwiftDeflate+NodeJSInflateRaw

Compress.swift

let data = "HelloZip!".data(using: .utf8)!
let compressedData = (data as NSData).compressed(using: .zlib) as Data
let compressedDataAsBase64EncodedString = compressedData.base64EncodedString()
print(compressedDataAsBase64EncodedString)
// Prints: 80jNycmPyixQBAA=

Decompress.js

import zlib from "zlib";

const compressedDataAsBase64EncodedString = "80jNycmPyixQBAA="
const compressedData = Buffer.from(compressedDataAsBase64EncodedString, "base64")
const data = zlib.inflateRawSync(compressedData)
console.log(data.toString())
// Prints: HelloZip!