Secure Your Node.js App in Minutes with zsecurity

What is zsecurity?

If you’re building apps with Node.js and Express (or Koa), you already know how important security is. Attacks like SQL injections, XSS, command injections, and bots can hit your app any time.

That’s where zsecurity comes in.
It’s a small package you install from npm that acts like a shield (WAF – Web Application Firewall) for your app. Think of it as a security guard standing at the door, checking every request before it reaches your code.

Why should you use zsecurity?

• Works out of the box
  Install it, plug it into your Express app, and boom—you’re already protected.
• Protects against common attacks
  Blocks things like SQL injection, cross-site scripting (XSS), command injection, and even known bad bots.
• Easy to customize
  Want to block a specific IP? Limit requests per minute? Ban access to certain URLs? You can do all of that with simple rules.
• Change rules anytime
  You don’t even need to restart your server—you can add or remove rules while your app is running.
• Lightweight & developer-friendly
  No heavy setup. No steep learning curve. Just a simple middleware you can drop into your app.

How to use it in your Express app

const express = require('express');
const zsecurity = require('zsecurity');

const app = express();

// Start with zsecurity defaults
app.use(zsecurity());

// Example: add a custom rule
const waf = zsecurity();
waf.ruleManager.addRule({
  id: 'block-ip',
  type: 'IP_BLACKLIST',
  description: 'Block suspicious IP',
  enabled: true,
  ips: ['203.0.113.45']
});
app.use(waf);

app.get('/', (req, res) => {
  res.send('Hello, secure world!');
});

app.listen(3000, () => {
  console.log('Server running on http://localhost:3000');
});

In just a few lines, you’ve got security running in your app.

Best part?

It’s open source (MIT license), so you can use it for free, tweak it however you like, or even contribute back.

If you’re building with Node.js and want to secure your app without wasting hours learning complicated tools, zsecurity is perfect for you.

• It’s quick to install
• Easy to use
• Protects your app from the most common attacks
• Lets you add custom rules whenever you need

​npm install zsecurity​
Check it out here: zsecurity on npm

Hope you find it helpful!