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Eta

Lightweight, powerful, pluggable embedded JS template engine. Written in TypeScript – use it in Node, Deno, or the browser.

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A faster, more lightweight, and more configurable EJS alternative

Eta vs. EJS:

  • • Eta supports Deno, out-of-the-box
  • • Eta supports layouts out of the box
  • • Eta allows left whitespace control (with -), something that doesn't work in EJS because EJS uses - on the left side to indicate that the value shouldn't be escaped. Instead, Eta uses ~ to output a raw value
  • • Eta gives you more flexibility with delimeters -- you could set them to {{ and }}, for example, while with EJS this isn't possible
  • • Eta adds plugin support
  • • Comments in Eta use /* ... */ which allows multiline commenting and is more consistent
  • • Eta doesn't break with delimiters inside strings and comments. Example: <%= "%>" %> works in Eta, while it breaks in EJS
  • • Eta exposes Typescript types and distributes a UMD build
  • • Eta allows custom tag-type prefixes. Example: you could change <%= to <%*
  • • Eta throws more informative errors. If you accidentally leave a tag, string, or multiline comment unclosed, Eta will tell you where the problem is
Users: <ul> <% it.users.forEach(function(user){ %> <li><%= user %></li> <% }) %> </ul>
<%= await getSomeValue() %> <% /* Eta supports multiline comments, which is really useful */ %> <%= "<%" %>
<%~ include("mypartial") %> <%~ include('./navbar', { pages: [ 'home', 'about', 'users' ] }) %>
<% layout("layouts/basic") %> <p>This will be rendered into a layout</p>