A leaked API key can lead to stolen data and surprise bills. These nine habits keep your keys safe.
1. Never Hardcode Keys
Keep keys out of your source files. Anyone who reads the code can read the key.
2. Use Environment Variables
Store keys in your server’s environment settings so they stay separate from your project files.
3. Use a Secrets Manager
Cloud secrets managers encrypt keys and control who can read them.
4. Exclude Secret Files From Version Control
Add configuration files that hold keys to your ignore list before your first commit.
5. Apply Least Privilege
Give each key only the permissions it needs, nothing more.
6. Restrict by Source
Limit keys to specific websites, servers, or IP addresses when the provider allows it.
7. Rotate Keys Regularly
Replace keys on a schedule so a stolen key stops working quickly.
8. Use Separate Keys per Environment
Keep different keys for testing and production, so a mistake in one never affects the other.
9. Monitor Usage
Set alerts for unusual spikes, which often signal misuse.
Final Thoughts
Treat every API key like a password. Layer these practices, and you will greatly reduce your risk.