done state

examples/express1.js

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+'use strict';
+
+const express = require('express');
+const app = express();
+
+app.use(express.static('./'));
+
+app.listen(3000);

examples/express2.js

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+'use strict';
+
+const express = require('express');
+const app = express();
+
+app.use(express.static('./'));
+
+app.get('/api/tasks', getTasks);
+app.get('/api/tasks/:id', getTask);
+
+app.listen(3000, () => console.log('Server is running...'));
+
+function getTasks(request, response) {
+    response.set('Content-Type', 'application/json');
+    response.end(JSON.stringify([{ id: 1 }, { id: 2 }]));
+}
+
+function getTask(request, response) {
+    var id = request.params.id;
+    response.set('Content-Type', 'application/json');
+    response.end(JSON.stringify({ id: id }));
+}

examples/express3.js

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+'use strict';
+
+const express = require('express');
+const bodyParser = require('body-parser');
+const app = express();
+
+app.use(bodyParser.json());
+
+app.get('/api/tasks', getTasks);
+app.post('/api/tasks', saveTask);
+
+app.listen(3000, () => console.log('Server is running...'));
+
+function getTasks(request, response) {
+    response.json([{ id: 1 }, { id: 2 }]);
+}
+
+function saveTask(request, response) {
+    console.log(request.body); // request should have correct content-type
+    response.end();
+}

examples/express4.js

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+'use strict';
+
+const express = require('express');
+const app = express();
+
+app.get('/api/p1', p1);
+app.get('/api/p2', p2);
+app.get('/api/p3', p3);
+
+app.use(errorHandler); // after request handlers
+
+app.listen(3000, () => console.log('Server is running...'));
+
+function p1(request, response) {
+    try {
+        throw new Error('p1');
+    } catch (error) {
+        response.status(500).send(error.toString());
+    }
+
+}
+
+function p2(request, response) {
+    try {
+        throw new Error('p2');
+    } catch (error) {
+        response.status(500).send(error.toString());
+    }
+}
+
+function p3(request, response) {
+    throw new Error('p3');
+}
+
+function errorHandler(error, request, response, next) { // there must be 4 arguments
+    response.status(500).send(error.toString());
+}

examples/express5.js

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+'use strict';
+
+const express = require('express');
+const app = express();
+
+app.get('/api/p', p1);
+app.get('/api/p', p2);
+
+app.use(errorHandler); // after request handlers
+
+app.listen(3000, () => console.log('Server is running...'));
+
+function p1(request, response, next) {
+    console.log('p1');
+    next();
+}
+
+function p2(request, response, next) {
+    console.log('p2');
+    next('error from p2'); // argument makes it an error
+}
+
+function errorHandler(error, request, response, next) { // there must be 4 arguments
+    response.status(500).send(error.toString());
+}

examples/express6.js

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+'use strict';
+
+const express = require('express');
+const app = express();
+
+app.get('/api/p1', p1);
+app.get('/api/p2', p2);
+
+app.use(errorHandler); // after request handlers
+
+app.listen(3000, () => console.log('Server is running...'));
+
+function p1(request, response, next) {
+    getData()
+        .then(data => response.end('ok: ' + data))
+        .catch(error => next(error));
+}
+
+function p2(request, response, next) {
+    getDataFails()
+        .then(data => response.end(data))
+        .catch(next);
+}
+
+function errorHandler(error, request, response, next) { // there must be 4 arguments
+    response.status(500).send('error: ' + error.toString());
+}
+
+function getData() {
+    return Promise.resolve('some data');
+}
+
+function getDataFails() {
+    return Promise.reject('some error');
+}