initial commit.

src/app.js

@@ -0,0 +1,42 @@
+
+import express from 'express'
+import { db } from './db';
+
+/*
+ * utility function to either get the value in the post data
+ * or send an error message to the response.
+ */
+function valOrMissing(data, key, res) {
+    if (!data[key]) {
+        res.status(403).json({"error": `missing "${key}"`})
+        return null;
+    }
+    return data[key];
+}
+
+
+export function createApp() {
+
+    // Creating an instance of Express
+    const app = express();
+    app.use(express.json()) // for parsing application/json
+    
+    app.put("/note", async (req, res) => {
+        const title = valOrMissing(req.body, "title", res);
+        if (!title) return;
+        const text = valOrMissing(req.body, "text", res);
+        if (!text) return;
+        const created = req.body["created"] ? Date.parse(req.body["created"]) : new Date();
+        const id = await db("note").insert({
+            title, text, created
+        }, ["id"])
+        return res.status(202).send({ "note": id[0].id });
+    });
+
+    app.get("/note/:id", async (req, res, next) => {
+        const note = await db.from("note").where({ id: req.params.id });
+        return res.status(200).send({ "note": note[0] });
+    });
+    
+    return app;
+}

src/app.spec.js

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+import { db } from "./db";
+import { createApp } from "./app";
+import request from "supertest";
+
+const app = createApp();
+
+const note = {
+    title: 'Test Note',
+    text: 'This is a test note.'
+};
+
+describe('PUT and GET methods of "/note" endpoint', () => {
+    it('should create and return a note with PUT method', async () => {
+        const res = await request(app).put('/note').send(note);
+        expect(res.status).toBe(202);
+        expect(res.body).toHaveProperty("note");
+    });
+
+    it('should return the created note with GET method', async () => {
+        const res = await request(app).put('/note').send(note);
+        const id = res.body["note"];
+        const res2 = await request(app).get(`/note/${id}`).send(note);
+        expect(res2.status).toBe(200);
+        expect(res2.body).toMatchObject({note: { ...note, id }});
+    });
+});

src/db.js

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+// Importing the Knex library
+import knex from 'knex';
+import 'dotenv/config'
+
+if (!process.env.DB_URL) {
+  fail("Ensure you set DB_URL");
+};
+
+// Creating an instance of Knex
+export const db = knex({
+    client: 'postgres',
+    connection: process.env.DB_URL
+});

src/index.js

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+// Importing express
+import { createApp } from './app';
+
+(() => {
+    const app = createApp();
+    // Start the Express server
+    app.listen(3000, () => {
+        console.log('Server started on port 3000');
+    });
+})();
+
+// Exporting the app
+export default app;