The backend team needs JWT authentication for internal API endpoints. Claude generated a middleware that validates tokens from the internal identity provider.
The identity provider issues RS256-signed JWTs with audience 'api.production.internal' and issuer 'auth.internal'. The public key is available at https://auth.internal/.well-known/jwks.json. Tokens expire after 15 minutes.
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export const authMiddleware = (req: Request, res: Response, next: NextFunction) => {
const token = req.headers.authorization?.replace('Bearer ', '');
if (!token) return res.status(401).json({ error: 'Missing token' });
jwt.verify(token, rsaPublicKey, {
algorithms: ['RS256'],
audience: 'api.production.internal',
issuer: 'auth.internal',
clockTolerance: 30
}, (err, decoded) => {
if (err) return res.status(403).json({ error: 'Invalid token' });
req.user = decoded;
next();
});
};