Question

How do you handle authentication in an API Gateway?

Answer 1

You can implement authentication in the API Gateway by adding middleware to check authentication tokens before proxying the request to backend services.

Example:

app.use((req, res, next) => {
    const token = req.headers['authorization'];
    if (token === 'valid-token') {
        next();
    } else {
        res.status(401).send('Unauthorized');
    }
});

app.use('/service1', createProxyMiddleware({ target: 'http://localhost:3001', changeOrigin: true }));
app.use('/service2', createProxyMiddleware({ target: 'http://localhost:3002', changeOrigin: true }));