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.

Have you...included pako on the page? – VLAZ Aug 10 '16 at 20:18 — VLAZ, Aug 10 '16 at 20:18
I have actually..that's the confusing part – atsnam Aug 12 '16 at 01:40 — atsnam, Aug 12 '16 at 01:40

Gandhi · Answer 1 · 2018-08-06T14:43:20.380

11

Download pako.js or pako.min.js from official pako github page
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);

edited Aug 06 '18 at 14:43

answered Aug 23 '16 at 11:19

Gandhi

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Your example is good, but your second alert is wrong because in both cases you're giving `output`, but the second one should be `originalInput`. – Rob Kwasowski Aug 05 '18 at 02:15
@RobKwasowski Thanks for the review. Corrected it. Cheers – Gandhi Aug 06 '18 at 14:43

perumal N · Answer 2 · 2021-11-24T13:38:10.737

3

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)

edited Nov 24 '21 at 13:38

answered Nov 24 '21 at 13:30

perumal N

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

2 Answers2

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