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.

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

Example 1:

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

// Including zlib module
var 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
  var unzip = zlib.createUnzip();
  unzip.write(data);
  unzip.on('data', function (data)
   {
      console.log(data.toString());
  });
});

Output:

Nidhi Singh

Example 2:

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

// Including zlib module
var 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
  var 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