EJS Online Compiler
EJS -- Embedded JavaScript -- is one of those templating engines that does exactly what it says. You embed JavaScript directly in your HTML templates. No new syntax to learn, no custom directives. If you know JavaScript, you know EJS.
It's been a go-to for server-side rendering in Express.js applications for years. But testing EJS templates locally means setting up a Node.js project, installing the ejs package, wiring up a route, and passing in data. That's a lot of ceremony when you just want to check if your loop renders correctly.
What an EJS online compiler gives you
An EJS online compiler lets you write a template, pass in some data, and see the rendered HTML output immediately. No Express server. No npm install. No route configuration.
This is useful when you're:
- Building a new template and want to iterate on the markup quickly
- Debugging why a variable isn't rendering the way you expect
- Teaching someone how EJS works without asking them to set up a Node project
- Prototyping an email template or a server-rendered page
EJS template example
Here's a practical example -- rendering a list of users with conditional styling. This is the kind of template you'd normally wire into an Express route:
<h2>Team Directory</h2>
<% var team = [
{ name: 'Alice', role: 'Backend', active: true },
{ name: 'Bob', role: 'Frontend', active: false },
{ name: 'Carol', role: 'DevOps', active: true },
{ name: 'Dave', role: 'QA', active: true }
]; %>
<table>
<tr><th>Name</th><th>Role</th><th>Status</th></tr>
<% for (var i = 0; i < team.length; i++) { %>
<tr style="color: <%= team[i].active ? 'green' : 'gray' %>">
<td><%= team[i].name %></td>
<td><%= team[i].role %></td>
<td><%= team[i].active ? 'Active' : 'Inactive' %></td>
</tr>
<% } %>
</table>
<p>Total members: <%= team.length %></p>
<p>Active: <%= team.filter(function(m) { return m.active; }).length %></p>
The <%= %> tags output escaped values. The <% %> tags run JavaScript without outputting. That's basically all of EJS. Try it on OneCompiler's EJS editor and you'll see the rendered HTML right away.
Why OneCompiler works well for EJS
Normally, testing an EJS template means:
- Create a Node.js project
- Install Express and EJS
- Write a route that renders the template with data
- Start the server
- Open the browser to the right port
With OneCompiler, you skip steps 1 through 5. You write the template, you see the output. The feedback loop drops from minutes to seconds.
Other things that help:
- Link sharing -- send your template to a designer or teammate and they see exactly what you see
- No environment drift -- everyone runs the same version of EJS, same rendering engine
- Good for learning -- if you're picking up EJS for a new Express project, you can experiment with syntax without touching your actual codebase
When you'd still use a local setup
If you're building a full Express.js application with partials, layouts, and data coming from a database, you need a local setup. An online compiler is for the template logic itself -- testing conditionals, loops, variable interpolation. Get the template right online, then drop it into your project.