Last updated: April 12, 2026
API Key vs OAuth — Which API Auth Method in 2026?
Quick Answer
API keys are simple secret strings for identifying and authenticating API clients. OAuth 2.0 provides scoped access tokens with user consent and expiration. API keys are simpler; OAuth is more secure and supports user-level permissions.
API Key vs OAuth — Side by Side
| Feature | API Key | OAuth |
|---|---|---|
| Complexity | Simple — pass key in header | Complex — authorization flow, tokens |
| Scope | Full access (usually) | Scoped permissions (read, write, admin) |
| Expiration | No expiry (usually manual rotation) | Token expiry with refresh mechanism |
| User Context | No — identifies app, not user | Yes — identifies specific user |
| Revocation | Regenerate key (disrupts all uses) | Revoke individual tokens |
| Use Cases | Server-to-server, internal APIs | User-facing apps, third-party access |
Verdict
Use API keys for simple server-to-server authentication and internal services. Use OAuth for user-facing applications, third-party API access, and when you need scoped permissions. Many APIs support both.
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