Questions tagged [pako]

Pako is a high speed zlib port to JavaScript. Pako is primarily built on nodeJS but can also be browserified and used in browsers as single source file eliminating the dependency of nodeJS.

About: Pako is a high speed zlib port to JavaScript. It is almost as fast in modern JS engines as C implementation. Pako is primarily built on nodeJS but can also be browserified and used in browsers as single source file eliminating the dependency of nodeJS.

It also provides chunking support for big blobs. Some of the famous projects that use pako are browserify (via browserify-zlib), JSZip, mincer, JS-Git and Tedit by @creatronix

Installation:

node.js: npm install pako

browser: bower install pako

Sample code:

var pako = require('pako');
var input = new Uint8Array();
// fill input data here
var output = pako.deflate(input);

var compressed = new Uint8Array();
// fill data to uncompress here
try {
   var result = pako.inflate(compressed);
} catch (err) {
   console.log(err);
}


var inflator = new pako.Inflate();
inflator.push(chunk1, false);
inflator.push(chunk2, false);
inflator.push(chunkN, true);
if (inflator.err) {
  console.log(inflator.msg);
}
var output = inflator.result;

Useful links:

Pako github repository

Issue Tracker

54 questions
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Decompressing Pako gzipped string with Python zlib

Say I want to compress the following JSON: {"test": 1, "test2": 2} I do that on the client side using Pako JS lib: const test_json = JSON.stringify(test) const gz_str = pako.gzip(test_json, { to: 'string' }) // Returns string…
Beinje
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pako.inflate() - Uncaught incorrect header check when trying to decompress data (ReactJS)

Good day. I am creating covid greenpass decoder in React App, and I need help with pako.js. I am trying to inflate Unit8Array which i got from base45 decoding. And I am getting "uncaught incorrect header check" error. I have tried adding {to:…
szemeg
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ERR_PACKAGE_PATH_NOT_EXPORTED : Package subpath './dist/pako.es5.js' is not defined by "exports"

I have an issue with the deployment of a node app to production. When I try to execute with Node a script I get the following error: internal/modules/cjs/loader.js:498 throw new ERR_PACKAGE_PATH_NOT_EXPORTED(basePath, mappingKey); ^ Error…
Javier
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json to base64 conversion

I have been looking at pako to change my base64 to JSON which I got to work perfectly. But how can I reverse it? I have used an online JSON to base64 but the results are different from my original base64 that I originally input. I have left a sample…
Wayne
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2 answers

How can I inflate this zlib byte string in python?

I'm writing a tool to interact with a popular data warehouse SaaS. Their online sql editor serializes sql worksheets to JSON, but the body of the SQL worksheet is zlib deflated using pako.js. I'm trying to read and inflate these zlib strings from…
Sethish
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1 answer

Deflate with Pako and inflate with asp net core

I'm trying to deflate a .xlsx file on the front end and inflate it in the server side, in a asp net core 2.2 server. I tried everything and i have this now: //JS code handleSaveFile = (file) => { var compressedFile =…
Júlio Almeida
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Pako.js error, "invalid stored block lengths" when trying to inflate Websocket messages

I'm trying to inflate messages from a third party websocket using javascript, but receiving a pako.js "invalid stored block lengths" error. The sample code I'm using to implement the web socket can be found here:…
Michael P
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Using pako to compress a file, then use an HTML form to upload it

I'm trying to use pako.js with a php form for uploading files. Here's what I want to happen: 1) User selects file via button 2) File is compressed on client side 3) Compressed file is uploaded to server Here's what I have so far, which does not…
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Pako js returns invalid result after inflate

I'm trying to compress js file on server, then decompress and run it on the client. Code on my server: const deflateString = pako.deflate(codeText, { to: 'string' }); const indexTemplate = fs.readFileSync('./index.ejs', 'utf-8'); const deflateString…
Max
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Using Pako deflate with Python

I'm trying to compress a dictionary for accessing an API. I read the code of someone compressing the data with JavaScript and a library called "pako" and tried it myself. It works perfectly: var myDictionary = {...} var b =…
Developer
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How to correctly send and receive deflated data

I'm using protobufs for serializing my data. So far I serialized my data on the server (node restify) send it, receive it (Request is made by XMLHttpRequest) and serialize it on the Client. Now I want to employ zipping to reduce the transfered file…
Bernd Strehl
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Conversion from Uint8Array to UTF-16 string freezes/crashes browser

I'm getting some sort of encoded data from server, which should be properly decoded and displayed on client as string(UTF-16). By the moment I'm doing something like this: _decodeContent: function(encodedContent) { var binaryContent =…
Filipp Shestakov
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How Pako library can gzip a request and send the GZIP_MAGIC that it can identify the request has been compress with gzip

This is application in Angular and Java. Tha angular is compressing the request with pako library, like this : var compressedBody = pako.gzip(JSON.stringify(request.body)) const clone = request.clone({ headers:…
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How to send Pako.js deflated data (Uint8Array) to React-Native Kotlin Bridge file?

not able to send Pako deflated (Uint8Array) data to react-native Kotlin native module in React native File let msg = JSON.stringify(largeDate); let compressed = pako.deflate(msg); send the Compressed data Through Amazone chime react native bridge…
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i am trying to use pako 2.1.0 library , it is not supporting for string inputs , so i tried with uint8Array . still having problem

data= { "AgreementId": "131", "Type": "Admin", "validFrom": "2020-07-12", "validTo": "2021-08-10", "internalDescription": "InternalDescrip", "customerName": "Test Customer", } first step we are converting data to…
V2rson
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