Auth isn’t just about logging users in — it’s about protecting your app, your data, and your customers.

And in 2025, two giants still dominate secure login architecture:

🔐 JWT (JSON Web Tokens)

🗂 Session-based authentication

So… which one should you use?

It depends on your app’s architecture, risk level, and scaling goals.

Here’s a breakdown:

📦 JWT Auth (Stateless)

• Used in APIs, SPAs, mobile apps
• Tokens stored in localStorage or cookies
• Scales easily (no server-side session storage)
• Easy to share across services

⚠️ Be careful with:

• Token leakage
• No built-in logout or revocation
• Token expiration ≠ instant session invalidation

🗃 Session Auth (Stateful)

• Ideal for classic web apps (Django, Express + EJS, etc.)
• Stores session ID on server, cookie in browser
• Easier to manage access control, invalidate sessions
• Great for apps with high sensitivity (banking, dashboards)

⚠️ Watch for:

• Scaling pain (you need sticky sessions or external session stores)
• More server-side overhead

At @Techlusion, we help SaaS teams:

• Choose the right authentication model for their stack
• Implement secure, scalable login flows in Node.js, Django, and modern frontends
• Prevent common pitfalls like insecure token storage, poor CORS handling, or CSRF exposure

We’ve included side-by-side code snippets and a visual flow so you can compare how both work in the real world 🔍

Over to You:

If you’re building SaaS in 2025, what are you using — JWT or Sessions?

And what made you pick it? Let’s discuss 👇