# Backend

- DevShelf page: https://devshelf.io/category/backend

## Subcategories

- [Server Frameworks](https://devshelf.io/category/server-frameworks.md): Backend and full-stack web frameworks and API frameworks (Express, FastAPI, tRPC, GraphQL...).
- [Authentication & Identity](https://devshelf.io/category/authentication-identity.md): Authentication, authorization, SSO and user management services.
- [Payments & Billing](https://devshelf.io/category/payments-billing.md): Payment processing, subscriptions, billing and merchant-of-record platforms.
- [Email & Notification APIs](https://devshelf.io/category/email-notification-apis.md): Transactional email APIs, SMTP relays and multi-channel notification infrastructure. Marketing campaigns go to Email Marketing.
- [Data & Utility APIs](https://devshelf.io/category/data-utility-apis.md): Third-party APIs to call from your code for data or a service: IP geolocation, SERP, screenshots, PDF or image generation, fake data, public datasets. Not every SaaS that has an API.

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Source: DevShelf.io, the hand-reviewed catalog of dev tools and resources. Every resource is reviewed by hand before it is listed.