API tokens open the door to your systems. They unlock code paths, control data, and trigger actions you thought were safe. The problem—too many teams treat them like static passwords, tucked in plain text, reused across services, living forever without review. Attackers know this. A stolen token isn’t noisy. No brute-force. No obvious break-in. Just silent access until the damage is done.
Security review for API tokens is not a checkbox. It is a continuous practice. The first step is visibility. If you can’t list every active token in your environment, you don’t control it. Scan code repositories, configs, and build logs. Search history, not just current branches. Tokens committed once often linger in old versions long after fixes are pushed.
Next, scope tokens to the lowest possible permissions. Avoid “god mode” keys. If a token exists to read public data, it should not allow writes or deletes. Map each token to a service, function, and owner. Unmapped tokens are accidents waiting to happen.
Rotation is your heartbeat. Short-lived tokens reduce the blast radius. A weekly, daily, or even hourly rotation policy forces stolen keys to expire fast. Automate it. Humans are too slow for real security here. Pair rotation with instant revocation—when a breach hits, seconds count.