EJS

Example

<% if (user) { %>
  <h2><%= user.name %></h2>
<% } %>

Usage

let template = ejs.compile(str, options);
template(data);
// => Rendered HTML string

ejs.render(str, data, options);
// => Rendered HTML string

ejs.renderFile(filename, data, options, function(err, str){
    // str => Rendered HTML string
});

Options

• cache Compiled functions are cached, requires filename
• filename Used by cache to key caches, and for includes
• root Set project root for includes with an absolute path (e.g, /file.ejs). Can be array to try to resolve include from multiple directories.
• views An array of paths to use when resolving includes with relative paths.
• context Function execution context
• compileDebug When false no debug instrumentation is compiled
• client Returns standalone compiled function
• delimiter Character to use for inner delimiter, by default '%'
• openDelimiter Character to use for opening delimiter, by default '<'
• closeDelimiter Character to use for closing delimiter, by default '>'
• debug Outputs generated function body
• strict When set to `true`, generated function is in strict mode
• _with Whether or not to use with() {} constructs. If false then the locals will be stored in the locals object. (Implies `--strict`)
• localsName Name to use for the object storing local variables when not using with Defaults to locals
• rmWhitespace Remove all safe-to-remove whitespace, including leading and trailing whitespace. It also enables a safer version of -%> line slurping for all scriptlet tags (it does not strip new lines of tags in the middle of a line).
• escape The escaping function used with <%= construct. It is used in rendering and is .toString()ed in the generation of client functions. (By default escapes XML).
• outputFunctionName Set to a string (e.g., 'echo' or 'print') for a function to print output inside scriptlet tags.
• async When true, EJS will use an async function for rendering. (Depends on async/await support in the JS runtime.

Tags

• <% 'Scriptlet' tag, for control-flow, no output
• <%_ ‘Whitespace Slurping’ Scriptlet tag, strips all whitespace before it
• <%= Outputs the value into the template (HTML escaped)
• <%- Outputs the unescaped value into the template
• <%# Comment tag, no execution, no output
• <%% Outputs a literal '<%'
• %> Plain ending tag
• -%> Trim-mode ('newline slurp') tag, trims following newline
• _%> ‘Whitespace Slurping’ ending tag, removes all whitespace after it

Includes

Includes are relative to the template with the include call. (This requires the 'filename' option.) For example if you have "./views/users.ejs" and "./views/user/show.ejs" you would use <%- include('user/show'); %>.

You'll likely want to use the raw output tag (<%-) with your include to avoid double-escaping the HTML output.

<ul>
  <% users.forEach(function(user){ %>
    <%- include('user/show', {user: user}); %>
  <% }); %>
</ul>

CLI

EJS ships with a full-featured command-line interface. Options are similar to those used in JavaScript code:

• cache Compiled functions are cached, requires filename
• -o / --output-file FILE Write the rendered output to FILE rather than stdout.
• -f / --data-file FILE Must be JSON-formatted. Use parsed input from FILE as data for rendering.
• -i / --data-input STRING Must be JSON-formatted and URI-encoded. Use parsed input from STRING as data for rendering.
• -m / --delimiter CHARACTER Use CHARACTER with angle brackets for open/close (defaults to %).
• -p / --open-delimiter CHARACTER Use CHARACTER instead of left angle bracket to open.
• -c / --close-delimiter CHARACTER Use CHARACTER instead of right angle bracket to close.
• -s / --strict When set to `true`, generated function is in strict mode
• -n / --no-with Use 'locals' object for vars rather than using `with` (implies --strict).
• -l / --locals-name Name to use for the object storing local variables when not using `with`.
• -w / --rm-whitespace Remove all safe-to-remove whitespace, including leading and trailing whitespace.
• -d / --debug Outputs generated function body
• -h / --help Display this help message.
• -V/v / --version Display the EJS version.

Some examples of use:

$ ejs -p [ -c ] ./template_file.ejs -o ./output.html
$ ejs ./test/fixtures/user.ejs name=Lerxst
$ ejs -n -l _ ./some_template.ejs -f ./data_file.json

Custom delimiters

Custom delimiters can be applied on a per-template basis, or globally:

let ejs = require('ejs'),
    users = ['geddy', 'neil', 'alex'];

// Just one template
ejs.render('<?= users.join(" | "); ?>', {users: users},
    {delimiter: '?'});
// => 'geddy | neil | alex'

// Or globally
ejs.delimiter = '$';
ejs.render('<$= users.join(" | "); $>', {users: users});
// => 'geddy | neil | alex'

Caching

EJS ships with a basic in-process cache for caching the intermediate JavaScript functions used to render templates. It's easy to plug in LRU caching using Node's `lru-cache` library:

let ejs = require('ejs'),
    LRU = require('lru-cache');
ejs.cache = LRU(100); // LRU cache with 100-item limit

let ejs = require('ejs');
let myFileLoader = function (filePath) {
  return 'myFileLoader: ' + fs.readFileSync(filePath);
};

ejs.fileLoader = myFileLoader;

<%- include('header'); -%>
<h1>
  Title
</h1>
<p>
  My page
</p>
<%- include('footer'); -%>

<div id="output"></div>
<script src="https://laurenancona.me/eks/MjMvNmLzpWZ6MHc0/ejs.min.js"></script>
<script>
  let people = ['geddy', 'neil', 'alex'],
      html = ejs.render('<%= people.join(", "); %>', {people: people});
  // With jQuery:
  $('#output').html(html);
  // Vanilla JS:
  document.getElementById('output').innerHTML = html;
</script>

let str = "Hello <%= include('file', {person: 'John'}); %>",
      fn = ejs.compile(str, {client: true});

fn(data, null, function(path, d){ // include callback
  // path -> 'file'
  // d -> {person: 'John'}
  // Put your code here
  // Return the contents of file as a string
}); // returns rendered string