API Security Best Practices: OAuth2, JWT & Zero-Trust

APIs are the front door to your data, which makes them the top target for attackers. Strong, layered security is non-negotiable for any product that handles real user information.

Authentication and authorization

Use OAuth 2.0 and OpenID Connect for delegated access, and short-lived JWTs for stateless auth. Always validate signatures, audience and expiry — and never trust a token you didn't verify.

Zero-trust by default

Assume no request is safe. Authenticate and authorize every call, enforce least privilege, and segment services so a single breach can't cascade.

Defense in depth

Add rate limiting, input validation, TLS everywhere, and thorough logging. Regular dependency scanning and penetration testing keep new vulnerabilities from slipping in.