Express application with express-ejs-layout template

2021-05-18 324 words 2 minutes

Contents

1 Environment

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$ node -v
v14.17.0
$ npm -v
6.14.13

1 Install express.js

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$ npm install express --save

2 Simple application

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const port = 3000,
  express = require("express"),
  app = express();

app
  .get("/", (req, res) => {
    res.send("Hi Express!") // send response to client
    console.log(req.params);
    console.log(req.body);
    console.log(req.url);
    console.log(req.query);
  })

  .listen(port, () => {
    console.log(`The Express.js sever has started and is listening port:` + `${port}`);
  });

Start server:

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$ node main
The Express.js sever has started and is listening port:3000

Then you can access http://localhost:3000/ to via browser.

Comparing to node.js simple web server, many step is hidden under the library.

3 Application using express-ejs-layouts

3.1 Install packages

ejs and express-ejs-layouts support express and ejs web page template.

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$ npm i ejs express express-ejs-layouts http-status-codes -S

3.2 Use ejs template

source

Code structure

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├── main.js
├── controllers
│   ├── errorController.js
│   └── homeController.js
├── package-lock.json
├── package.json
├── public
│   ├── 404.html
│   └── 405.html
└── views
    ├── index.ejs
    ├── layout.ejs
    └── partials
        └── navigation.ejs

For using ejs template, main.js calls:

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const layouts = require("express-ejs-layouts");
app.user(layouts);

views/layout.ejs defines the template, like:

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<body>
	<%- include('partials/navigation') %>
	<div>
		<%- body %>
	</div>
	<div id="footer" class="block">FOOTER</div>
</body>
</html>

Then the other pages like views/index.ejs supplement the <%- body %> parts at layout.ejs like:

index.ejs

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<% let name = "Hoge"; %>
<h1>Hello, <%= name %></h1>

3.3 Run server

As I installed nodemon by npm i nodemon -S and add below to package.json,

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"scripts": {
    "start": "nodemon start"
  },`

Start server by:

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$ npm start
...
Server running at http://localhost:3000

Then web page is generated by template.

Reference

書籍 - 入門NODE.JSプログラミング (link to Amazon.co.jp)