The original method for what you asked would be to use partials. Partials have since been removed, and replaced with the include function of EJS. This is how you would include a file:
<% include header.html %>
<% include footer.html %>
Any locals you pass to the rendered page will also be passed to an include. For example:
app.js
app.get('/', function(req, res) {
res.render(__dirname + '/index.html', {
string: 'random_value',
other: 'value'
});
});
index.html
<!DOCTYPE html>
<body>
<%= other %>
<% include content.html %>
</body>
content.html
<pre><%= string %></pre>
The resultant HTML you would get is:
<!DOCTYPE html>
<body>
value
<pre>random_value</pre>
</body>
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