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Google Cloud API Gateway is a fully managed service that enables you to create, secure, monitor, and manage APIs for serverless backends. It acts as a front door for your Cloud Functions, Cloud Run services, and App Engine applications, providing authentication, rate limiting, and monitoring without any changes to your backend code.
API Gateway sits between your API consumers (mobile apps, web clients, partner integrations) and your backend services. It handles cross-cutting concerns — authentication, authorisation, rate limiting, request validation, and monitoring — so your backend code can focus on business logic.
| Feature | Description |
|---|---|
| OpenAPI specification | Define your API using OpenAPI 2.0 (Swagger) |
| Authentication | API keys, Firebase Auth, Google ID tokens, Auth0, Okta |
| Rate limiting | Throttle requests per consumer |
| Monitoring | Automatic Cloud Logging and Cloud Monitoring integration |
| Fully managed | No infrastructure to provision or manage |
| Multi-backend | Route to Cloud Functions, Cloud Run, App Engine, or any HTTP endpoint |
API Gateway uses three core resources:
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