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Express middleware is used to add a VincentJWT-specific authentication to your Express.js server routes All functionality is encapsulated into a single factory function — see createVincentUserMiddleware for details You can see the source for the Express authentication handler below; use this as a reference to implement your own midddleware/authentication for other frameworks! Pull requests are welcome. 
function getAuthenticateUserExpressHandler<const UserKey extends string>({
  allowedAudience,
  requiredAppId,
  userKey,
}: {
  allowedAudience: string;
  requiredAppId: number | undefined;
  userKey: UserKey;
}) {
  return async (req: Request, res: Response, next: NextFunction) => {
    const authHeader = req.headers.authorization;
    if (!authHeader) {
      res.status(401).json({ error: 'No token provided' });
      return;
    }

    const parts = authHeader.split(' ');
    if (parts.length !== 2) {
      res.status(401).json({ error: `Invalid authorization header - expected "Bearer <token>"` });
      return;
    }

    const [scheme, rawJWT] = parts;
    if (!/^Bearer$/i.test(scheme)) {
      res.status(401).json({ error: `Expected "Bearer" scheme, got "${scheme}"` });
      return;
    }

    try {
      const decodedJWT =
        requiredAppId != null
          ? await verifyVincentAppUserJWT({
              jwt: rawJWT,
              expectedAudience: allowedAudience,
              requiredAppId,
            })
          : await verifyVincentPlatformJWT({
              jwt: rawJWT,
              expectedAudience: allowedAudience,
            });

      if (!decodedJWT) {
        res.status(401).json({ error: 'Invalid token' });
        return;
      }

      (req as unknown as Record<string, VincentJWTData>)[userKey] = {
        decodedJWT,
        rawJWT,
      } as VincentJWTData;

      next();
    } catch (e) {
      res.status(401).json({ error: `Invalid token: ${(e as Error).message}` });
    }
  };
}

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