How to manage token expiration and refresh

· Category: API & REST

Short answer

Token lifecycle management balances security and usability by limiting token lifetimes while providing seamless re-authentication through refresh tokens.

Steps

  1. Issue short-lived access tokens with expiration measured in minutes.
  2. Issue long-lived refresh tokens bound to the client and user session.
  3. Validate refresh tokens on each use and rotate them to detect reuse.
  4. Revoke tokens on logout, password change, or suspected compromise.
  5. Securely store tokens in HTTP-only cookies or secure device storage.

Tips

  • Use sliding expiration for refresh tokens with an absolute maximum lifetime.
  • Implement grace periods to handle network latency during concurrent refresh requests.
  • Monitor for refresh token reuse as an indicator of token theft.
  • Avoid exposing tokens in URLs or client-accessible JavaScript.

Common issues

  • Race conditions causing multiple refresh requests and invalidating valid tokens.
  • Leaked refresh tokens enabling long-term unauthorized access.
  • Poorly handled expiration causing repeated user re-authentication prompts.
  • Clock skew between servers leading to premature token rejection.

Example

curl -X GET https://api.example.com/users   -H "Accept: application/json"   -H "Authorization: Bearer $TOKEN"

This curl command demonstrates a standard GET request with headers for content negotiation and bearer token authentication.

Additional context

Applying these principles consistently across projects leads to more maintainable systems, clearer team communication, and better outcomes for end users. Regular review and refinement of practices ensure continuous improvement.