Creating a basic RESTful web service

As a first step, Listing 14.9 creates a web service that implements some of the combinations of URL and HTTP methods described in Table 14.4.

Listing 14.9: Creating a basic web service in the index.ts file in the src/server/api folder

import { Express } from "express";
import repository from "../data";
export const createApi = (app: Express) => {
    app.get("/api/results", async (req, resp) => {
        if (req.query.name) {
            const data = await repository.getResultsByName(
                req.query.name.toString(), 10);
            if (data.length > 0) {
                resp.json(data);
            } else {
                resp.writeHead(404);
            }
        }   else {
                resp.json(await repository.getAllResults(10));
        }
        resp.end();
    });
}

The listing shows how easy it is to create an API for clients by repurposing the parts of the application...