I am developing a web application and need to choose between REST APIs and GraphQL. What are the main differences in data fetching, endpoint design, performance, caching, and versioning? Which approach is more suitable for an ASP.NET Core application that serves a web client and a mobile application?
REST and GraphQL both let applications communicate with a server, but they handle requests and responses differently. REST organizes an API around resources and endpoints; GraphQL lets the client specify which fields it needs.
| Aspect | REST | GraphQL |
|---|---|---|
| How requests are organized | Usually uses resource-based endpoints, such as /users/42 or /users/42/posts. |
Clients send queries to a GraphQL API, commonly through one endpoint. |
| Response data | The server defines the response for each endpoint. | The client selects the fields it wants, and the response follows that selection. |
| Getting related data | May require multiple requests to fetch related resources. | A query can often request related data together. |
| Common trade-off | Some requests may return unused fields, or require extra requests to gather everything needed. | Flexible queries can reduce over-fetching and under-fetching, but the API team needs to manage query complexity and permissions. |
| Caching | Works naturally with HTTP caching practices, though implementation still depends on the API. | Often needs more deliberate caching strategies because many different queries may use the same endpoint. |
REST can be a good fit when resources and operations are predictable and straightforward HTTP behavior is useful. GraphQL may suit applications whose screens need different combinations of related data. Neither approach is automatically faster or better; the right choice depends on the clients, data, and operational needs of the API.
