Token Security Best Practices — Protecting Your Authentication Tokens
Token storage strategies, rotation patterns, revocation mechanisms, and binding techniques to prevent token theft
Tokens are the keys to your application. Access tokens unlock API endpoints. Refresh tokens mint new access tokens. Session tokens represent entire user sessions. If an attacker gets their hands on any of these tokens, they become that user. No password needed, no MFA prompt, no questions asked.
Your AI agent generates code that creates and uses tokens. But the security of those tokens depends on decisions that agents often get wrong: where to store them, how long they live, when to rotate them, and how to revoke them. A token that works perfectly is not the same as a token that's secure.
The Token Storage Problem
Where you store tokens determines your attack surface. There are four common storage locations, and only two are acceptable.
localStorage (dangerous): Tokens in loca
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