How to use pako.js javascript? Pako is not defined

Question

I'm fairly new to JavaScript. I'm currently working on an algorithm that deflates in Java and inflates in javascript. For the most part, I have heard that pako.js is a good tool to use for decompression but I'm having problems implementing it. I created a function in JavaScript that passes the base64 string as a parameter.

function decompressHtml(html){

                var compressedData = atob(html);
                var charData = compressedData.split('').map(function(x){return x.charCodeAt(0);});
                var binData = new Uint8Array(charData);
                var inflated = '';


                try {
                  inflated = pako.inflate(binData);

                } catch (err) {
                  console.log(err);
                }

                return inflated;

        }

It always returns an error that says that pako is not properly defined. Is there a specific script tag/s that need to be inserted in order to define pako? I realise this may be a simple question to answer but I'm not sure of the answer.

Answer 1

1. Download pako.js or pako.min.js from official pako github page

2. Include the downloaded file in your html as follows:

   <script type="text/javascript" src="pako.js"></script>

Sample code:

var input = "test string";
var output = pako.gzip(input,{ to: 'string' });
alert("compressed gzip string - " + output);
var originalInput = pako.ungzip(output,{ to: 'string' });
alert("uncompressed string - " + originalInput);

Answer 2

This will help you

Decompress

const input = new Uint8Array(res);
const restored = JSON.parse(pako.inflate(input, { to: 'string'}));
console.log(restored)

Compress

const input = new Uint8Array(res);
const output = pako.deflate(input);
console.log(output)