An Introduction to zx: Simplifying Script Writing with Node

Today we discuss the impressive project zx , which gained 15,000 stars in one month and topped the 2021 star project list. zx is described as a tool that makes writing scripts easier.

According to its official description, zx provides useful wrappers around child_process , escapes arguments, and offers sensible defaults, allowing developers to write scripts more conveniently than using raw Bash or standard Node.js APIs.

The article explains key concepts such as Shell, Bash, Node, and how zx fits between them: Shell is the outer layer connecting to the kernel, Bash is a common command‑line shell, and Node is a programming language that can execute commands; zx, built on Node, enables script‑based command execution.

Typical script use cases include repetitive tasks, data format processing, import/export, small utility creation, and environment configuration. Examples range from downloading videos and music to counting words and automating sign‑ins.

Anyone can benefit from scripting—both developers and non‑developers. For instance, a WordPress site can be installed with a one‑click script.

The article then evaluates zx, Node, and Bash by implementing a batch audio‑video compression script. The workflow consists of four steps: traversing the current directory, determining file types, executing the compression command, and handling output.

Directory traversal code examples:

#!bin/bash
for file in `ls`;
do
    ...
 done

import fs from 'fs';
const dirs = fs.readdirSync('./');
for (let i of dirs) {
    ...
}

const dirs = (await $`ls`).stdout.split('\n');
for (let i of dirs) {
    ...
}

zx’s syntax is as concise as Bash while avoiding the need to import modules.

File‑type detection examples:

if test -f $file
then
    filename=$(basename $file);
    if [ "${file##*.}"x = "mp4"x ]; then
        ...
    fi
    if [ "${file##*.}"x = "mp3"x ]; then
        ...
    fi
fi

if (dirs[i] && !fs.statSync(source).isDirectory()) {
    if (source.endsWith('.mp4')) {
        ...
    }
    if (source.endsWith('.mp3')) {
        ...
    }
}

$`ffmpeg -i ${file} -r 30 -c copy -c:v libx264 -vf scale=720:-2 ${file.replace('.mp4','')}-30-720.mp4;`

The comparison shows Bash and zx are similarly concise for traversal, but zx beats Node by eliminating import boilerplate; for type checking, Node and zx are clearer than Bash; for executing ffmpeg, zx matches Bash’s brevity while Node requires additional wrapper code.

A summary table rates the three approaches on learning curve and code complexity, concluding that zx offers a simple learning curve with concise code.

Overall, zx provides a “simple and clean” scripting experience, making it attractive for both developers and non‑developers.