Node.js zlib.createUnzip() Method

The zlib.createUnzip() method is an inbuilt application programming interface of the Zlib module which is used to create a new Unzip object.

Syntax:

zlib.createUnzip( options )

Parameters: This method accepts single parameter options which is an optional parameter that holds the zlib options. 

Return Value: It returns a new Unzip object. 

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

Example 1: In this example, we will see the use of zlib.createUnzip() method.

javascript

// Node.js program to demonstrate the
// createUnzip() method

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

// Calling gzip function to compress data
zlib.gzip('Nidhi Singh', function (err, data) {
    if (err) {
        return console.log('err', err);
    }
    // Calling createUnzip method
    // to decompress the data again
    const unzip = zlib.createUnzip();
    unzip.write(data);
    unzip.on('data', function (data) {
        console.log(data.toString());
    });
});

Output:

Nidhi Singh

Example 2: In this example, we will see the use of the createUnzip() method.

javascript

// Node.js program to demonstrate the
// createUnzip() method

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

// Calling gzip function to compress data
zlib.gzip('Nidhi Singh', function (err, data) {
    if (err) {
        return console.log('err', err);
    }
    // Calling createUnzip method
    // to decompress the data again
    const unzip = zlib.createUnzip();
    unzip.write(data);
    unzip.on('data', function (data) {
        console.log(data.toString('hex'));
    });
});

Output:

4e696468692053696e6768

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