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Node.js zlib.unzip() Method

Last Updated : 25 Apr, 2025
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The zlib.unzip() method is an inbuilt application programming interface of the Zlib module which is used to decompress a chunk of data. 

Syntax:

zlib.unzip( buffer, options, callback )

Parameters: This method accepts three parameters as mentioned above and described below:

  • buffer: It can be of type Buffer, TypedArray, DataView, ArrayBuffer, and string.
  • options: It is an optional parameter that holds the zlib options.
  • callback: It holds the callback function.

Return Value: It returns the chunk of data after decompression. 

The below examples illustrate the use of zlib.unzip() method in Node.js:

Example 1: 

javascript 
// Node.js program to demonstrate the    
// unzip() method

// Including zlib module
const zlib = require("zlib");

// Declaring input and assigning
// it a value string
let input = "GfG";

// Calling gzip method
zlib.gzip(input, (err, buffer) => {

    // Calling unzip method
    zlib.unzip(buffer, (err, buffer) => {

        console.log(buffer.toString('utf8'));

    });
});

console.log("Data Decompressed...");

Output:

Data Decompressed...
GfG

Example 2: 

javascript 
// Node.js program to demonstrate the    
// unzip() method

// Including zlib module
const zlib = require("zlib");

// Declaring input and assigning
// it a value string
let input = "GfG";

// Calling gzip method
zlib.gzip(input, (err, buffer) => {

    // Calling unzip method
    zlib.unzip(buffer, (err, buffer) => {

        console.log(buffer.toString('base64'));

    });
});

console.log("Data Decompressed...");

Output:

Data Decompressed...
R2ZH

Reference: https://nodejs.org/api/zlib.html#zlib_zlib_unzip_buffer_options_callback


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Node.js zlib.unzipSync() Method
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