How to compress folders natively in nodejs

With the continuous development of today's Internet technology and business, file transfer and storage have become an indispensable part. We often need to compress some relatively large files or folders into a compressed package for easy transmission or storage. How do developers implement folder compression?

This article will introduce how to use Node.js to natively realize the folder compression function.

Node.js is a JavaScript running environment based on the Chrome V8 engine. It allows JavaScript to run on the server. It also provides a large number of modules, allowing developers to develop various applications quickly and conveniently. program. In Node.js, file operations are very common functions. Then for folder compression, we can use the "zlib" module in Node.js to achieve it.

First we need to install the Node.js environment. Please refer to the official documentation for details. Then enter the path of the folder we want to compress on the command line, and use the following command to install the zlib module:

npm install zlib

After the installation is complete, we can start writing code to compress the folder. The following is a code example of specific implementation:

const fs = require('fs');
const zlib = require('zlib');

// 要压缩的文件夹路径
const folderPath = './test/';

// 压缩文件名
const destPath = './test.zip';

// 创建压缩流
const zipStream = zlib.createGzip();

// 创建可写流
const writeStream = fs.createWriteStream(destPath);

// 读取要压缩的文件夹
fs.readdir(folderPath, function(err, files) {
  if (err) throw err;
  // 遍历文件夹
  files.forEach(function(file) {
    // 创建读取流
    const readStream = fs.createReadStream(folderPath + file);
    // 把读取流添加到压缩流
    readStream.pipe(zipStream);
  });
  // 把压缩流添加到可写流
  zipStream.pipe(writeStream);
});

In the above code, we use the fs module in Node.js to read files in the folder, and the zlib module to create compressed streams and writable streams. The entire compression process can be divided into the following steps:

1. Introduce the Node.js core modules fs and zlib.
2. Define the folder path and compressed file name to be compressed.
3. Create compressed streams and writable streams.
4. Read the folder to be compressed.
5. Traverse all files in the folder, create a read stream, and add the read stream to the compressed stream.
6. Add the compressed stream to the writable stream to achieve compression.
7. After the compression is completed, the writable stream and the compressed stream must be closed.

Run the above code, we can generate a file named "test.zip" in the current directory, which contains all the files in the folder we want to compress.

Finally, let me summarize. Through the zlib module and fs module in Node.js, we can compress folders to facilitate file transmission and storage. Of course, we can also use third-party modules such as "archiver", "zip-stream", etc. to achieve similar functions, but in lightweight application scenarios, native Node.js implementation is also a good choice.

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