What is gunzip() in Node.js zlib module?
The zlib module in Node.js provides compression and decompression functionality utilizing Gzip, Deflate/Inflate, and Brotli.
It can be accessed in your program with:
const zlib = require('zlib');
gunzip() is a function of the zlib module that allows decompressing a stream of data.
Syntax
zlib.gunzip( buffer, options, callback )
Parameters
-
bufferis the data to be decompressed. It can be of any type, such as Buffer, TypedArray, DataView, ArrayBuffer, or string. -
optionsis an optional argument that is used to provide options to thezlibclasses. -
callbackis the call-back function that is executed.
Return value
The gunzip() method returns decompressed data.
Example
In the following example, we provide an input string to the gzip() method, which compresses the input in line 8. Then, we use the gunzip() method in line 13 to recover the original input string. We provide the compressed data buffer and the callback function as arguments to the gunzip() method.
// Including zlib moduleconst zlib = require("zlib");//input declarationvar input = "Educative";// Calling gzip method to compress datazlib.gzip(input, (err, buffer) => {console.log("Compressed data: ",buffer.toString('utf8'));// Calling gunzip methodzlib.gunzip(buffer, (err, buffer) => {console.log("Decompressed data: ",buffer.toString('utf8'));});});
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