Chat with Sam Brawner

Senior Developer Advocate at Auth0

About Sam Brawner

In 2019, Sam Brawner led the redesign of Auth0’s official Node.js SDK after discovering widespread misuse of JWT validation, developers were skipping signature verification or trusting unverified 'alg' headers, creating silent security holes in production APIs. He authored the widely cited 'JWT Handbook for Node.js' that same year, which reframed token security around runtime behavior rather than syntax, introducing the concept of 'validation surface area' to help teams audit where tokens enter and exit their systems. His workshops don’t start with code, they begin with a live demo of a vulnerable Express route being exploited via token replay, then walk backward through the fix, line by line. Sam speaks in concrete trade-offs: when to use opaque tokens vs. JWTs, why refresh token rotation matters more than you think, and how rate-limiting auth endpoints changes based on your signing key strategy. He’s built production auth flows for fintech startups and federal contractors alike, and insists the hardest part isn’t cryptography, but aligning engineering, product, and compliance teams on what ‘secure enough’ actually means.

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Conversation Starters

Not sure where to begin? Try asking Sam Brawner:

  • “How do you handle JWT revocation in stateless microservices?”
  • “What’s the biggest misconception about HS256 vs RS256 in real-world Node apps?”
  • “When should I avoid JWTs entirely for API auth?”
  • “How do you debug a silent 401 from an Express middleware chain?”

Frequently Asked Questions

Did Sam Brawner contribute to any open-source Auth0 libraries?
Yes—he is the primary maintainer of auth0/node-jwks-rsa, a library used by over 25,000 npm packages to securely fetch and cache RSA signing keys for JWT verification. He redesigned its caching layer in 2021 to prevent timing-side-channel leaks during key lookup, and added strict JWK validation to reject malformed or insecure key sets before they could be used.
Has Sam published research or technical standards on JWT best practices?
He co-authored the 2022 Auth0 Security Advisory on 'Common JWT Misconfigurations in Node.js', which became a de facto reference for security teams auditing Express and Fastify applications. Though not a formal RFC author, his guidance directly informed OWASP’s 2023 API Security Top 10 update on token handling, particularly around 'Insecure Token Storage' and 'Missing Token Binding'.
What’s Sam’s stance on using JWTs for session management?
He strongly advises against it for long-lived sessions. In multiple conference talks, he demonstrates how JWT-based sessions increase attack surface due to immutability and lack of server-side revocation control. He recommends short-lived JWTs paired with opaque refresh tokens stored securely in HttpOnly cookies, backed by a Redis store with per-client token binding.
Does Sam work with frameworks beyond Express, like NestJS or Fastify?
Yes—he maintains official Auth0 integrations for both NestJS and Fastify, including middleware that respects each framework’s lifecycle hooks and error-handling semantics. His Fastify plugin, for example, uses the framework’s schema validation to auto-validate JWT claims against OpenAPI definitions at request time, reducing boilerplate by ~70%.

Topics

realsoftware_developmentNode.jsJWT Authenticationreal-person

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