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# EJS Embedded JavaScript templates [](https://travis-ci.org/mde/ejs) [](https://david-dm.org/mde/ejs?type=dev) [](https://snyk.io/test/npm/ejs) ## Installation ```bash $ npm install ejs ``` ## Features * 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](http://expressjs.com) view system ## Example ```html <% if (user) { %> <h2><%= user.name %></h2> <% } %> ``` Try EJS online at: https://ionicabizau.github.io/ejs-playground/. ## Usage ```javascript var 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 }); ``` 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. ## Options - `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. - `root` Set project root for includes with an absolute path (/file.ejs). - `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 ([ejs.min.js](https://github.com/mde/ejs/releases/latest)). - `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). - `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). This project uses [JSDoc](http://usejsdoc.org/). 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 the both the public & private API docs, run `npm run devdoc` instead. ## Tags - `<%` '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](https://github.com/mde/ejs/blob/master/docs/syntax.md). ## Includes 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. ```html <ul> <% users.forEach(function(user){ %> <%- include('user/show', {user: user}) %> <% }); %> </ul> ``` 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: Include preprocessor directives (`<% include user/show %>`) are still supported. ## Custom delimiters Custom delimiters can be applied on a per-template basis, or globally: ```javascript 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(" | "); $>', {users: users}); // => 'geddy | neil | alex' ``` ## Caching EJS ships with a basic in-process cache for caching the intermediate JavaScript functions used to render templates. It's easy to plug in LRU caching using Node's `lru-cache` library: ```javascript var ejs = require('ejs') , LRU = require('lru-cache'); ejs.cache = LRU(100); // LRU cache with 100-item limit ``` If you want to clear the EJS cache, call `ejs.clearCache`. If you're using the LRU cache and need a different limit, simple reset `ejs.cache` to a new instance of the LRU. ## Custom FileLoader The default file loader is `fs.readFileSync`, if you want to customize it, you can set ejs.fileLoader. ```javascript var ejs = require('ejs'); var myFileLoad = function (filePath) { return 'myFileLoad: ' + fs.readFileSync(filePath); }; ejs.fileLoader = myFileLoad; ``` With this feature, you can preprocess the template before reading it. ## Layouts EJS does not specifically support blocks, but layouts can be implemented by including headers and footers, like so: ```html <%- include('header') -%> <h1> Title </h1> <p> My page </p> <%- include('footer') -%> ``` ## Client-side support Go to the [Latest Release](https://github.com/mde/ejs/releases/latest), download `./ejs.js` or `./ejs.min.js`. Alternately, you can compile it yourself by cloning the repository and running `jake build` (or `$(npm bin)/jake build` if jake is not installed globally). Include one of these files on your page, and `ejs` should be available globally. ### Example ```html <div id="output"></div> <script src="ejs.min.js"></script> <script> var people = ['geddy', 'neil', 'alex'], html = ejs.render('<%= people.join(", "); %>', {people: people}); // With jQuery: $('#output').html(html); // Vanilla JS: document.getElementById('output').innerHTML = html; </script> ``` ### Caveats 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, `include`s do not work unless you use an `IncludeCallback`. Here is an example: ```javascript var str = "Hello <%= include('file', {person: 'John'}); %>", fn = ejs.compile(str, {clien