Function routing shares the same syntax aspage routing.

Static Routing

Both top-level and nested routes are supported.

• src/api/top-level.js =>/api/top-level
• src/api/directory/foo.js =>/api/directory/foo

index.js files are routed at their directory path e.g.src/api/users/index.js =>/api/users

Dynamic Routing

Param routes

Use square brackets ([ ]) in the file path to mark dynamic segments of the URL.

So to create an Function for fetching user information byuserId:

Dynamic routes share syntax withclient-only routes.

Splat routes

Gatsby also supports splat (or wildcard) routes, which are routes that will match anything after the splat. These are less common, but still have use cases.