The **`createDeflate` method** of the `zlib` module in Node.js serves as an #key# API: Application Programming Interface #key# that returns a new [Deflate](https://nodejs.org/api/zlib.html#zlib_class_zlib_deflate) object.

The process is illustrated below:

To use the `createDeflate` method, you will need to import the `zlib` module into the program, as shown below:

```Java
const zlib = require('zlib');
```

The prototype of the `createDeflate` method is shown below:

```Java
createDeflate([options])
```

# Parameters

The `createDeflate` method takes a single optional parameter, i.e., an [options](https://nodejs.org/api/zlib.html#zlib_class_options) object.

# Return value

The `createDeflate` method returns a newly created `Deflate` object.

# Example

The code below shows how the `createDeflate` method works in Node.js:


This is a text file to demonstrate the createDeflate() method.

// including the required modules	
var zlib = require('zlib');
var fs = require('fs');

// creating a Deflate object
var compressor = zlib.createDeflate({level : 9, chunkSize: 1000});

// setup readable stream for input file
var read = fs.createReadStream('test.txt');

// setup writeable stream to zip file
var write = fs.createWriteStream('test.txt.gz');

// transform stream to compress data
var compressed_stream = read.pipe(compressor)

// pipe compressed data to zip file
compressed_stream.pipe(write);
	
console.log("The file has been zipped!");

# Explanation

First, a `Deflate` object, `compressor`, is initialized through the `createDeflate` method in line $6$. `compressor` will be used to zip an input file. The `level` option is set to $9$ as part of the `options` parameter to ensure maximum compression. The value of `level` can be changed or omitted based on your requirements. The `chunkSize` option is set to $1000$, which specifies the maximum size of data chunks.

Next, the code opens a readable stream from the input file `test.txt`. A writable stream to the zipped file `test.txt.gz` is also created.

The data from the readable stream is piped to the `Deflate` object, `compressor`, in line $16$. `compressor` proceeds to compress the input file. The newly compressed data is piped to the writable stream, and the zipped file `test.txt.gz` is created.

>Note: You can read up further on the `zlib` module and its methods [here](https://nodejs.org/api/zlib.html).
 





What is the createDeflate method of the zlib module in Node.js?

It returns a Deflate object for compressing data with optional parameters for configuration.