Hey folks! So you want to learn about securing your web apps? Been meaning to write about this for a while because, honestly, I struggled with this for months. 😅 I remember the frustration of watching my first app get hit by a basic SQL injection attack. Not fun! Anyway, here's what I learned the hard way and hope it saves you some headaches.
Start with Authentication and Authorization
When I first tried implementing authentication, I made the rookie mistake of storing passwords as plain text. 🤦♂️ Big no-no! Pro tip from someone who's been there: Always hash your passwords using a strong algorithm like bcrypt.
const bcrypt = require('bcrypt'); const saltRounds = 10; const plainTextPassword = 'mysecretpassword'; bcrypt.hash(plainTextPassword, saltRounds, (err, hash) => { console.log(hash); });Copy-paste this, trust me! Btw, I wrote about secure password storage last week - check it out!
Use HTTPS Everywhere
If you're like me, you've probably wondered if HTTPS is really necessary for your small project. Spoiler: It is. Secure Sockets Layer (SSL) certificates can prevent numerous attack vectors. And let's not forget about data integrity and confidentiality. This is what worked for me after tons of trial and error.
Implement Input Validation
One big thing that left me worried was user input. Make sure you validate all kinds of input data. Honestly, it took me weeks to figure this out, but using libraries for data validation was a game-changer. This snippet saved my project, hope it helps you too:
const Joi = require('joi'); const schema = Joi.object({ username: Joi.string().min(3).max(30).required(), password: Joi.string().pattern(new RegExp('^[a-zA-Z0-9]{3,30}$')), email: Joi.string().email() }); const result = schema.validate({ username: 'abc', password: 'abc123', email: 'email@example.com' });Check out my input validation tips for more pointers.
Protect Against Common Attacks
There are countless types of attacks, but some of the most common ones include XSS and CSRF. In my latest project, I used Content Security Policies (CSP) to mitigate XSS. And for CSRF, don't forget to use anti-CSRF tokens. Here's a basic example of how you can integrate a CSP:
res.setHeader('Content-Security-Policy', "default-src 'self'");I personally prefer using libraries like helmet.js to simplify these configurations.
Learn more about common web attacks and how to tackle them.
Conclusion
I'm not an expert, but these steps helped me secure my web applications. There are better ways, but this is what I use in my projects. Try this out and let me know how it goes! Drop a comment if you get stuck anywhere. 😊 I'll update this post if I find something better.
If you enjoyed this, you might like my post on Web App Security 101. Stay safe out there, fellow developers!
