CODEWITHSUNDEEP
node.jsejs
Headshota
Headshota

Reputation: 21449

How do I render an EJS template file in Node.js?

I'm using Node.js and trying to render an EJS template file. I figured out how to render strings:

    var http = require('http');
    var ejs = require('ejs');

    var server = http.createServer(function(req, res){
        res.end(ejs.render('Hello World'));
    });

    server.listen(3000);

How can I render an EJS template file?

Upvotes: 26

Views: 54687

Answers (7)

Amadan
Amadan

Reputation: 198314

var fs = require('fs');
var templateString = fs.readFileSync('template.ejs', 'utf-8');

and then you do your thing:

var server = http.createServer(function(req, res){
    res.end(ejs.render(templateString));
});

Upvotes: 28

Ankur Mahajan
Ankur Mahajan

Reputation: 3596

Use ejs.renderFile(filename, data) function with async-await.

To render HTML files.

const renderHtmlFile = async () => {
    try {
        //Parameters inside the HTML file
        let params = {firstName : 'John', lastName: 'Doe'};
        let html = await ejs.renderFile(__dirname + '/template.html', params);
        console.log(html);
    } catch (error) {
        console.log("Error occured: ", error);
    }
}

To render EJS files.

const renderEjsFile = async () => {
    try {
        //Parameters inside the HTML file
        let params = {firstName : 'John', lastName: 'Doe'};
        let ejs = await ejs.renderFile(__dirname + '/template.ejs', params);
        console.log(ejs);
    } catch (error) {
        console.log("Error occured: ", error);
    }
}

Upvotes: 1

ksloan
ksloan

Reputation: 1492

There is a function in EJS to render files, you can just do:

    ejs.renderFile(__dirname + '/template.ejs', function(err, data) {
        console.log(err || data);
    });

Source: Official EJS documentation

Upvotes: 54

Kartik Malik
Kartik Malik

Reputation: 41

@ksloan's answer is really good. I also had the same use case and did little bit of digging. The function renderFile() is overloaded. The one you will need mostly is:

renderFile(path: string,data, cb)

for example:

ejs.renderFile(__dirname + '/template.ejs', dataForTemplate, function(err, data) {
console.log(err || data)
})

where dataForTemplate is an object containing values that you need inside the template.

Upvotes: 4

Wtower
Wtower

Reputation: 19902

The answer of @ksloan should be the accepted one. It uses the ejs function precisely for this purpose.

Here is an example of how to use with Bluebird:

var Promise = require('bluebird');
var path = require('path');
var ejs = Promise.promisifyAll(require('ejs'));

ejs.renderFileAsync(path.join(__dirname, 'template.ejs'), {context: 'my context'})
  .then(function (tpl) {
    console.log(tpl);
  })
  .catch(function (error) {
    console.log(error);
  });

For the sake of completeness here is a promisified version of the currently accepted answer:

var ejs = require('ejs');
var Promise = require('bluebird');
var fs = Promise.promisifyAll(require('fs'));
var path = require('path');

fs.readFileAsync(path.join(__dirname, 'template.ejs'), 'utf-8')
  .then(function (tpl) {
    console.log(ejs.render(tpl, {context: 'my context'}));
  })
  .catch(function (error) {
    console.log(error);
  });

Upvotes: 3

Greg
Greg

Reputation: 2609

There's a synchronous version of this pattern that tightens it up a little more.

var server = http.createServer(function(req, res) {
    var filePath = __dirname + '/sample.html';
    var template = fs.readFileSync(filePath, 'utf8');
    res.end(ejs.render(template,{}));
});

Note the use of readFileSync(). If you specify the encoding (utf8 here), the function returns a string containing your template.

Upvotes: 3

alessioalex
alessioalex

Reputation: 63663

All you have to do is compile the file as a string (with optional local variables), like so:

var fs = require('fs'), ejs = require('ejs'), http = require('http'), 
         server, filePath;
filePath = __dirname + '/sample.html'; // this is from your current directory
fs.readFile(filePath, 'utf-8', function(error, content) {
  if (error) { throw error); }
  // start the server once you have the content of the file
  http.createServer(function(req, res) {
    // render the file using some local params
    res.end(ejs.render(content, {
      users: [
        { name: 'tj' },
        { name: 'mape' },
        { name: 'guillermo' }
      ]
    });  
  });
});

Upvotes: 5

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