Node.js ZLIB

Node.js ZLIB

The Node.js Zlib module is a powerful built-in utility that enables compression and decompression (zip and unzip) functionalities. It’s implemented using Gzip and Deflate/Inflate algorithms, allowing developers to efficiently reduce file sizes and manage data transfer more effectively.

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You can access the Zlib module in Node.js using:

const zlib = require('zlib');

With Zlib, compressing and decompressing files becomes simple — you can pipe data streams through Zlib’s transformation streams to achieve both operations seamlessly.

Node.js ZLIB Example: Compress a File

Let’s look at a practical example of using the Node.js Zlib module to compress a file named input.txt into a new compressed file input.txt.gz.

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File: zlib_example1.js

const zlib = require('zlib');
const gzip = zlib.createGzip();
const fs = require('fs');
const inp = fs.createReadStream('input.txt');
const out = fs.createWriteStream('input.txt.gz');

inp.pipe(gzip).pipe(out);

Make sure you have a text file named input.txt available (for example, on your desktop).

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Now, open your Node.js command prompt and run:

node zlib_example1.js

This will create a compressed file named input.txt.gz in the same directory.

Node.js ZLIB Example: Decompress a File

Next, let’s see how to decompress the previously generated input.txt.gz file back into a readable text file input2.txt.

File: zlib_example2.js

const zlib = require('zlib');
const unzip = zlib.createUnzip();
const fs = require('fs');
const inp = fs.createReadStream('input.txt.gz');
const out = fs.createWriteStream('input2.txt');

inp.pipe(unzip).pipe(out);

Execute the script using:

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node zlib_example2.js

After running this, you’ll find a new file named input2.txt in your directory. It will contain the same data as the original input.txt file.

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To better understand how effective compression is, try creating an input.txt file with a large amount of data (for example, 40 KB). Once compressed using Zlib, the resulting input.txt.gz file might be as small as 1 KB. When you decompress it back, you’ll get your original 40 KB of data perfectly restored.

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