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Node.js | zlib.gunzip() Method

  • Last Updated : 05 Mar, 2020

The zlib.gunzip() method is an inbuilt application programming interface of the Zlib module which is used to decompress a chunk of data.

Syntax:

zlib.gunzip( 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.

Below examples illustrate the use of zlib.gunzip() method in Node.js:



Example 1:




// Node.js program to demonstrate the     
// gunzip() method
  
// Including zlib module
const zlib = require("zlib");
  
// Declaring input and assigning
// it a value string
var input = "Geek";
  
// Calling gzip method
zlib.gzip(input, (err, buffer) => {
  
  // Calling gunzip method
 zlib.gunzip(buffer, (err, buffer) => {
  
    console.log(buffer.toString('utf8'));
      
    });
 });
  
console.log("Data Decompressed...");

Output:

Data Decompressed...
Geek

Example 2:




// Node.js program to demonstrate the     
// gunzip() method
  
// Including zlib module
const zlib = require("zlib");
  
// Declaring input and assigning
// it a value string
var input = "Geek";
  
// Calling gzip method
zlib.gzip(input, (err, buffer) => {
  
  // Calling gunzip method
 zlib.gunzip(buffer, (err, buffer) => {
  
    console.log(buffer.toString('hex'));
      
    });
 });
  
console.log("Data Decompressed...");

Output:

Data Decompressed...
4765656b

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




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