OAuth tokens have limited lifetimes. When a token expires without being renewed, your integrations stop working and your users are impacted.
Anticipate expirations with proactive OAuth token monitoring.
Signs of an Expired Token
- 401 Unauthorized error: the API refuses requests with "token expired".
- 403 Forbidden error: sometimes returned instead of 401 depending on implementation.
- Explicit message: the body often contains "access_token expired".
Prevention
- Refresh token: implement automatic renewal via refresh token.
- Proactive monitoring: alert X days before long-lived token expiration.
- Service token: for monitoring, use tokens with long lifetimes.
Automate with MoniTao
- 401 alert: get alerted immediately if an API returns 401.
- Content validation: detect "expired" error messages in responses.
Frequently Asked Questions
How to know a JWT's expiration date?
Decode the JWT (base64) and read the "exp" claim (Unix timestamp).
What lifetime for a monitoring token?
Ideally 1 year or more. Some APIs allow non-expiring tokens.
Can I monitor the refresh token itself?
Yes, periodically test that the refresh token still works.
What if I no longer have a refresh token?
You'll need to re-authenticate manually. That's why proactive monitoring is crucial.
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