How to Secure API Endpoints in a Centralized Crypto Exchange?

Problem-
APIs in a centralized crypto exchange are vulnerable to brute-force attacks, replay attacks, and unauthorized access. A common mistake is exposing APIs without authentication and rate-limiting.

Solution-
Use JWT (JSON Web Token) for authentication and rate-limiting middleware in Express.js to prevent excessive API calls.

Example Implementation-
javascript

const jwt = require('jsonwebtoken');
const express = require('express');
const rateLimit = require('express-rate-limit');

const app = express();
const SECRET_KEY = "your_secret_key";

// JWT Authentication Middleware
const authenticate = (req, res, next) => {
    const token = req.headers['authorization'];
    if (!token) return res.status(401).json({ message: "Unauthorized" });

    jwt.verify(token.split(" ")[1], SECRET_KEY, (err, decoded) => {
        if (err) return res.status(403).json({ message: "Invalid token" });
        req.user = decoded;
        next();
    });
};

// Rate Limiting
const limiter = rateLimit({
    windowMs: 1 * 60 * 1000, // 1 minute
    max: 100 // Limit each IP to 100 requests per windowMs
});

app.use(limiter);
app.get('/secure-data', authenticate, (req, res) => {
    res.json({ message: "Secure data accessed" });
});

app.listen(3000, () => console.log("Server running on port 3000"));

This prevents API abuse while ensuring authenticated access.

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