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Використання шаблонізаторів в Express

A template engine enables you to use static template files in your application. At runtime, the template engine replaces variables in a template file with actual values, and transforms the template into an HTML file sent to the client. This approach makes it easier to design an HTML page.

Some popular template engines that work with Express are Jade, Mustache, and EJS. The Express application generator uses Jade as its default, but it also supports several others.

See Template Engines (Express wiki) for a list of template engines you can use with Express. See also Comparing JavaScript Templating Engines: Jade, Mustache, Dust and More.

To render template files, set the following application setting properties:

Then install the corresponding template engine npm package; for example to install Jade:


$ npm install jade --save

Express-compliant template engines such as Jade export a function named __express(filePath, options, callback), which is called by the res.render() function to render the template code.

Some template engines do not follow this convention. The Consolidate.js library follows this convention by mapping all of the popular Node.js template engines, and therefore works seamlessly within Express.

After the view engine is set, you don’t have to specify the engine or load the template engine module in your app; Express loads the module internally, as shown below (for the above example).


app.set('view engine', 'jade');

Create a Jade template file named index.jade in the views directory, with the following content:


html
  head
    title= title
  body
    h1= message

Then create a route to render the index.jade file. If the view engine property is not set, you must specify the extension of the view file. Otherwise, you can omit it.


app.get('/', function (req, res) {
  res.render('index', { title: 'Hey', message: 'Hello there!'});
});

When you make a request to the home page, the index.jade file will be rendered as HTML.

To learn more about how template engines work in Express, see: “Developing template engines for Express”.