What is OAuth 2.0 and when do I need it?

OAuth 2.0 is an authorization framework (RFC 6749) that lets users grant third-party applications access to their data without sharing their password. You need OAuth 2.0 when building: "Login with Google/GitHub/Facebook", access to Gmail or Google Drive on behalf of a user, Stripe Connect for marketplace payments, or GitHub integrations that act on user repositories.

What is the difference between OAuth 2.0 and OpenID Connect?

OAuth 2.0 handles authorization (what can this app do?). OpenID Connect (OIDC) is an identity layer on top of OAuth 2.0 that adds authentication (who is this user?). OIDC adds an id_token (JWT) containing user identity information. When you implement "Login with Google", you are using OAuth 2.0 + OIDC together.

Can API keys be used for OAuth flows?

No. OAuth flows require a client ID and secret, an authorization endpoint, a token endpoint, and redirect URIs. API keys are a separate, simpler mechanism. Some providers use the term "API key" loosely to mean a client credential for the OAuth client credentials flow, but that is different from a simple API key.

What OAuth 2.0 grant type should I use?

Authorization Code + PKCE: for web apps and mobile apps accessing user data (the standard). Client Credentials: for server-to-server, machine-to-machine access with no user involved. Device Code: for CLI tools and TV apps with no browser. Avoid the Implicit flow (deprecated) and Resource Owner Password flow (sends user credentials to your server).

How do I secure an API key?

Never commit API keys to version control. Use environment variables or a secrets manager (AWS Secrets Manager, HashiCorp Vault, Vercel env vars). Rotate API keys regularly and after any suspected leak. Scope keys to minimum required permissions when the provider supports it. Use separate keys for development and production. Monitor API key usage for anomalies.

Last updated: April 14, 2026

OAuth 2.0 vs API Key: Authorization Methods Compared

Quick Answer

OAuth 2.0 is a full authorization framework with user consent flows, scoped access, and token expiry - designed for third-party integrations. API keys are simple static tokens for direct server access. OAuth 2.0 is required when users grant your app access to their data on another platform (Google, GitHub, Stripe). API keys work for direct API access where you control both sides.

OAuth 2.0 vs API Key — Side by Side

Feature	OAuth 2.0	API Key
Complexity	High: authorization server, flows, token exchange	Low: generate a key and send it in a header
User consent	Yes: user explicitly grants access via consent screen	No: key grants access without user interaction
Token expiry	Yes: access tokens expire (minutes to hours)	No: API keys are long-lived by default
Scope control	Yes: request only the permissions you need	No: key typically grants full account access
Best for	Third-party integrations, "Login with Google/GitHub"	Server-to-server, internal tools, simple integrations
Revocation	Access token expires; refresh token revocable per user	Manual revocation; single revocation cuts all clients
Standard	RFC 6749: widely adopted open standard	No standard: each provider varies

Verdict

If users need to grant your app access to their data on another service, OAuth 2.0 is required - it is not optional. For direct server-to-server API access where you own both sides, API keys are simpler and sufficient. Many APIs support both: OAuth for user-scoped operations and API keys for account-level automation.

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