Works

server.js

@@ -1,19 +1,61 @@
 'use strict';
 
 const express = require('express');
+const bodyParser = require('body-parser');
 
 const TaskService = require('./task-service');
 const dao = new TaskService();
 const app = express();
 
+app.use(bodyParser.json()); // before request handlers
+app.use(express.static('./'));
+
 app.get('/api/tasks', getTasks);
+app.get('/api/tasks/:id', getTask);
+app.post('/api/tasks', addTask);
+app.delete('/api/tasks/:id', deleteTask);
+
+app.use(errorHandler); // after request handlers
 
 app.listen(3000, () => console.log('Server is running on port 3000'));
 
 function getTasks(request, response) {
+    response.set('Content-Type', 'application/json');
     dao.getTasks()
         .then(tasks => {
-            console.log(tasks);
-            response.end('ok');
+            response.json(tasks);
         });
 }
+
+function getTask(request, response, next) {
+    var id = request.params.id;
+    dao.getTask(id)
+        .then(task => {
+            response.set('Content-Type', 'application/json');
+            response.json(task);
+        }).catch(next)
+}
+
+function addTask(request, response) {
+    var task = request.body
+    dao.addTask(task)
+        .then(task => {
+            response.set('Content-Type', 'application/json');
+            response.json(task);
+        }).catch(next)
+}
+
+function deleteTask(request, response) {
+    var id = request.params.id;
+
+    dao.deleteTask(id)
+        .then(task => {
+            response.set('Content-Type', 'application/json');
+            response.json(task);
+        }).catch(next)
+}
+
+function errorHandler(error, request, response, next) { // there must be 4 arguments
+    response.status(500).send('error: ' + error.toString());
+}
+

task-service.js

@@ -15,6 +15,33 @@ class MemTaskService {
         return Promise.resolve(this.clone(this.tasks));
     }
 
+    getTask(id) {
+        for (let task of this.tasks) {
+            if (task._id === id) {
+                return Promise.resolve(this.clone(task));
+            }
+        }
+        return Promise.reject(`no task with id: ${id}`)
+    }
+
+    addTask(task) {
+        task._id = this.getNewId();
+        this.tasks.push(task);
+        return Promise.resolve(this.clone(task));
+    }
+
+    deleteTask(id) {
+        var task = null;
+        for (let i=0; i < this.tasks.length; i++) {
+            if (this.tasks[i]._id === id) {
+                this.tasks.splice(i, 1);
+                return Promise.resolve();
+            }
+        }
+        return Promise.reject(`no task with id: ${id}`)
+    }
+
+
     clone(what) {
         return JSON.parse(JSON.stringify(what));
     }