2.4.11 • Public • Published


Embedded JavaScript templates, with extensions


$ npm install github:BananaAcid/ejs-with-exts
or last published:
$ npm install ejs-with-exts


Main stream ejs code is compatible. This module extends on top of ejs, incorporating bugfixes, standalone capabilities,


  • Control flow with <% %>
  • Escaped output with <%= %> (escape function configurable)
  • Unescaped raw output with <%- %>
  • Newline-trim mode ('newline slurping') with -%> ending tag
  • Whitespace-trim mode (slurp all whitespace) for control flow with <%_ _%>
  • Custom delimiters (e.g., use '' instead of '<% %>')
  • Includes
  • Client-side support
  • Static caching of intermediate JavaScript
  • Static caching of templates
  • Complies with the Express view system
  • --
  • Readded old style filters ( <%- your_var | first %> )
  • preprocessor option to pass a function to proccess the content before EJS
  • With fixed Issues from the @mde tracker
  • Using option 'with', it applies the correct context
  • ES6 yield support (setting option {es6: true})
  • echo as function to output strings from code
  • CLI tool ($ ejs), as stdin compiler and as file/folder compiler
  • fileLoader (lookup function) is a global ejs option, that can be replaced to setup security settings and more
  • fileLoaderManagement classes + simple wrapper that can be passed to the fileLoader option
    • Able to parse different path constructs
    • Handle content loading
    • Modify (like word filters) content)
  • codeTransformer is another global option - to unleash JS compilers onto the loaded JS (sourcemaps are not supported yet)
  • renderFile() is able to return the content directly if callback is set to null (returns {err,content})
  • ExpressJS multi-views support
  • default file extension can be changed, for example, to match the delimiter


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


var template = ejs.compile(str, options);
// => Rendered HTML string
var templateStr = ejs.render(str, data, options);
// => Rendered HTML string
 // right most param is expected to be the callback
var cbResult = ejs.renderFile(filename, data, options, cb=function(err, str) {
    // err => Error
    // str => Rendered HTML string
// => result from the cb
var info = ejs.renderFile(filename, data, options, cb=null);
// => {err: Error|null, content: "Rendered HTML string"|null}

It is also possible to use ejs.render(dataAndOptions); where you pass everything in a single object. In that case, you'll end up with local variables for all the passed options. However, be aware that your code could break if we add an option with the same name as one of your data object's properties. Therefore, we do not recommend using this shortcut.


  • cache Compiled functions are cached, requires filename
  • filename The name of the file being rendered. Not required if you are using renderFile(). Used by cache to key caches, and for includes.
  • context Function execution context
  • compileDebug When false no debug instrumentation is compiled
  • client When true, compiles a function that can be rendered in the browser without needing to load the EJS Runtime
  • delimiter Character to use with angle brackets for open/close
  • debug Output 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. Set to false in strict mode.
  • 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).
  • preprocessor Add a function that accepts and returns a string to proccess the content before EJS
  • 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).

Global Options

set on the ejs object itself

  • delimiter Character to use with angle brackets for open/close (should not contain any signs used as appended in the Tags sesction)
  • fileExtension Template file extension to use
  • fileLoader Use to To imply security restrictions, takes a filepath, returns a template string (see fileLoader management classes)
  • codeTransformer Use to pass prepared template JS to a compiler function (takes and returns a JS-code string) that unserstands EJS-debug JS (TypeScript, babeljs, ..)

JSDoc usage

This project uses JSDoc. For the full public API documentation, clone the repository and run npm run doc. This will run JSDoc with the proper options and output the documentation to out/. If you want both, the public & private API docs, run npm run devdoc instead.


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

For the full syntax documentation, please see docs/syntax.md.


3 Methods

  • <%- include('path'); %> independly called, outputted, echo() outputting to the include's buffer which is returned by include() (so <%- or a variable is needed to use the returned buffer)
  • <% include path %> sharing context (if added to this), single line command (old backwards compat)
  • #include 'some.js'; sharing context (if added to this), is part of the code / can be used with other statements (and other hash-include-directives)

Includes either have to be an absolute path, or, if not, are assumed as relative to the template with the include call. For example if you are including ./views/user/show.ejs from ./views/users.ejs you would use <%- include('user/show') %>.

You must specify the filename option for the template with the include call unless you are using renderFile().

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

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

Includes are inserted at runtime, so you can use variables for the path in the include call (for example <%- include(somePath) %>). Variables in your top-level data object are available to all your includes, but local variables need to be passed down.

NOTE: Standalone EJS-Include-preprocessor directives (<% include user/show %>) are still supported.

NOTE: In subsequently loaded templates, you can add functions and vars to be available in the parents and other subequent templates by using this, e.g. this.myGlobalVar = 123;

about the include directive

since there are sandbox/security restrictions, you may use the hash-include-directive to include files in the the same scope, within the same output buffer:

  #include 'some.js';
  #include 'some2.ejs';

Custom delimiters

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

var 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'


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:

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

If you want to clear the EJS cache, call ejs.clearCache. If you're using the LRU cache and need a different limit, simple reset ejs.cache to a new instance of the LRU.


EJS does not specifically support blocks, but layouts can be implemented by including headers and footers, like so:

<%- include('header') -%>
  My page
<%- include('footer') -%>

NOTE: you may use the preprocessor option to load Jade, Markdown and others. They may generate EJS parsable code, since preprocessors are parsed first.


EJS by default, just loads a file an parses it. To imply security restrictions, modify the output, or just rewrite the path and load the content, the loader can be replaced globally:

var ejs = require('ejs');
ejs.fileLoader = function(filePath) {
  return 'new content + from file: ' + fs.readFileSync(filePath);

NOTE: the preprocessor option is able to modify the content on a per-template basis, based on the loaded and prepared contents before EJS parses it.

fileLoader management classes

A more complex way is using the FileLoader managememnt classes allows you to modify the data each object holds

var ejs = require('ejs');
ejs.fileLoader = function(filePath) {
  var flm = ejs.fileLoaderManagement
    , x = new flm.FileSelector(filePath).singleFileSupport().starSupport()
    , y = new flm.ContentLoader(x).loadAll()
    , z = new flm.ContentOutputter(y).filterWords()
    //- now you could trigger any preprocessor on each loaded tpl:string using: `z.applyFn( the_preprocessor(<string>):<string> );`
    , tpl = z.toString();
    //- now you could trigger any preprocessor on the complete tpl:string : finishdTpl = the_preprocessor(tpl)
  return tpl;

You may also use the defaults for content loading and parsing, if the file selection is what you need

var ejs = require('ejs');
ejs.fileLoader = function(filePath) {
  var flm = ejs.fileLoaderManagement
    , tpl = new flm.FileSelector(filePath, '.ejs').singleFileSupport(); // or any other FileSelector function
  return tpl;

But: there is also a file management classes wrapper that returns a fileLoader handler:

var ejs = require('ejs');
ejs.fileLoader = new ejs.fileLoaderManagement.FileLoader({
  FileSelector: ['singleFileSupport', 'starSupport', {'fileSupportFn': function(filePath, inFiles){ return /*outFIles*/[]; }}],
  ContentLoader: ['loadAll'],
  ContentOutputter: ['filterWords']

FileSelector FNs

new FileSelector(filePath, optionalDefaultExt) parses a path

  • fileSupportFn(fn) user supplied fn, fn(filePath<string>, currentfiles<array<string>>):newFilesToAdd<array<string>>
  • singleFileSupport() add parsing of single files, and without and without ext
  • starSupport(optionalAllowedExts) support path with * (e.g. './tpls/*') instead of a file to load all from a folder, array of exts to load (defaults to optionalDefaultExt or '.ejs')
  • toString() loads all selected files and returns the concatinated template by ContentOutputter (see file management wrapper)

ContentLoader FNs

new ContentLoader(fileSelector) loads files

  • loadAllFn(fn) user supplied fn gets called on each path from FileSelector, fn(path<string>)
  • loadAll() loads the contents of all files

ContentOutputter FNs

new ContentOutputter(contentLoader) modifies the loaded contents on a per file basis

  • applyFn(fn) applies a user function to all loaded template chunks, fn(path<buffer>, content<string>):newContent<string|buffer>
  • filterWords(optionalRegexp, optionalReplacement) applies a replace
  • jsHandler(optionalDelimiter) if a .js file is called, it wrapps it into EJS default <% .. %> delimiters (if you do not use the default ones, you will need to supply them here too)
  • toString() concatinates all contents and returns the completed template (see file management wrapper)


echo() can be used to output strings from code. (<% echo('Hello world'); %>)

Client-side support

Go to the Latest Release, download ./ejs.js or ./ejs.min.js. Alternately, you can compile it yourself by cloning the repository and running jake build (or $(npm bin)/jake build if jake is not installed globally).

Include one of these files on your page, and ejs should be available globally.


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


Most of EJS will work as expected; however, there are a few things to note:

  1. Obviously, since you do not have access to the filesystem, ejs.renderFile() won't work.
  2. For the same reason, includes do not work unless you use an IncludeCallback. Here is an example:
var str = "Hello <%= include('file', {person: 'John'}); %>",
    fn = ejs.compile(str, {client: true});
fn(data, null, function(path, d){ // IncludeCallback
  // path -> 'file'
  // d -> {person: 'John'}
  // Put your code here 
  // Return the contents of file as a string
}); // returns rendered string

CLI tool

Just open the help to get going.

$ ejs --help
 EJS - Embedded JavaScript templates CLI
  Usage:  [options] [dir|file ...]                                                 
    -h, --help               output usage information                              
    -V, --version            output the version number                             
    -O, --obj <str|path>     JavaScript options object or JSON file containing it  
    -l, --locals <str|path>  JavaScript locals object or JSON file containing it   
    -o, --out <dir>          output the compiled html to <dir>, otherwise to screen
    -p, --path <path>        filename used to resolve includes                     
    -d, --delimiter <char>   delimiter to use for denoting JS code                 
    -c, --client             compile function for client-side                      
    -D, --no-debug           compile without debugging (smaller functions)         
    -w, --watch              watch files for changes and automatically re-render   
    -E, --extension <ext>    specify the output file extension                     
    # renders all EJS files in the `templates` directory                            
    $ ejs templates                                                                
    # create {foo,bar}.html                                                         
    $ ejs {foo,bar}.ejs                                                            
    # read my.ejs and output to my.html through stdio                               
    $ ejs my.ejs > my.html                                                         
    # reads EJS string from stdin and output to stdout                              
    $ echo '<%= "hello ejs" %>' | ejs                                              
    # reads EJS string from stdin and output to my.html through stdio               
    $ echo '<%= "hello ejs" %>' | ejs > my.html                                    
    # reads EJS string from stdin and output to my.html through stdio and gzip it   
    $ echo '<%= "hello ejs" %>' | ejs | gzip -f > my.html.gz                       
    # foo, bar dirs rendering to /tmp                                               
    $ ejs foo bar --out /tmp

Related projects

There are a number of implementations of EJS:


Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)

EJS Embedded JavaScript templates copyright 2112 mde@fleegix.org.



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