Routing, schema verification, and handling utilities on top of Express.

• 🗺 Extend existing applications using an express.Router
• 🚪 Automatic path prefixing using a route map
• ✅ Schema validation primitives built using Joi
• 📚 Generate API documentation from routes
• 📑 Fully typed

Schema validation occurs on both input and output, preventing unexpected outputs and allowing for full automatic documentation of both inputs and outputs.

Example

const stub: RouteStub = {
  in_schema: { type: "object", values: { str: { type: "string" } } },
  out_schema: { type: "object", values: { str: { type: "string" } } },
  handler: async ({ body }) => {
    if (body.str === "good") return Ok({ str: "okay" });
    else return Err("not okay");
  },
};

const apiRoutes: Route[] = [{ path: "/get", method: "post", stub }];

const routeMap: RouteMap = [["/api", apiRoutes]];
const routes = compileRouteMap(routeMap);

Applying the router

const server = express();
const router = express.Router();
compileRouter(router, routes);
server.use(router);

Generating API documentation

exportRoutes(routes);

[
  {
    path: "/api/get",
    method: "post",
    in_schema: { type: "object", values: { str: { type: "string" } } },
    out_schema: { type: "object", values: { str: { type: "string" } } },
  },
];

Schema validation

{
  type: "object",
  values: {
    email: { type: "string", subType: "email" },
    minMax: { type: "string", min: 5, max: 50, optional: true },
    els: { type: "array", elementType: { type: "string" } },
  },
}