API Key is a unique identifier passed in API requests to authenticate the calling application and track usage.
API Key
API Key is a unique identifier passed in API requests to authenticate the calling application and track usage.
Why It Matters
API keys are the most common form of API authentication, yet they are also the most frequently leaked credential type. GitGuardian detected 12.8 million secrets in public GitHub repos in 2023, with API keys comprising the majority. A single leaked key can grant an attacker full access to your cloud services.
How It Works
An API key is a long random string generated by a service provider (e.g., OpenAI, Stripe, AWS). The client includes it in request headers or query parameters. The provider validates the key, identifies the account, and applies rate limits and permissions accordingly.
Best Practices
- Never hardcode API keys in source code
- Use environment variables or a secrets manager
- Rotate keys on a regular schedule
- Apply least-privilege scoping where the provider supports it
- Monitor key usage for anomalies
Common Mistakes
- Committing keys to Git repositories
- Sharing a single key across multiple team members
- Never rotating keys after employee offboarding
- Storing keys in plaintext config files
How ShieldKey Helps
ShieldKey replaces direct API key sharing with encrypted proxy tokens (Shield Tokens). Your real API key is stored with AES-256-GCM encryption and never exposed to team members. Each person gets a revocable shield token instead.
Try ShieldKey FreeFAQ
What is an API key?
An API key is a unique string used to authenticate requests to an API service. It identifies the calling application and is used for billing, rate limiting, and access control.
Are API keys secure?
API keys provide basic authentication but lack features like expiration, scoping, and revocation granularity. They should be protected with additional controls like IP allowlisting and proxy-based access.