Res Render

Renders a view and sends the rendered HTML string to the client. Optional parameters:

• locals, an object whose properties define local variables for the view.
• callback, a callback function. If provided, the method returns both the possible error and rendered string, but does not perform an automated response. When an error occurs, the method invokes next(err) internally.

The view argument is a string that is the file path of the view file to render. This can be an absolute path, or a path relative to the views setting. If the path does not contain a file extension, then the view engine setting determines the file extension. If the path does contain a file extension, then Express will load the module for the specified template engine (via require()) and render it using the loaded module's __express function.

For more information, see Using template engines with Express.

{% include admonitions/warning.html content="The view argument performs file system operations like reading a file from disk and evaluating Node.js modules, and as so for security reasons should not contain input from the end-user." %}

{% include admonitions/warning.html content="The locals object is used by view engines to render a response. The object keys may be particularly sensitive and should not contain user-controlled input, as it may affect the operation of the view engine or provide a path to cross-site scripting. Consult the documentation for the used view engine for additional considerations." %}

{% include admonitions/caution.html content="The local variable cache enables view caching. Set it to true, to cache the view during development; view caching is enabled in production by default." %}

// send the rendered view to the client
res.render('index')

// if a callback is specified, the rendered HTML string has to be sent explicitly
res.render('index', (err, html) => {
  res.send(html)
})

// pass a local variable to the view
res.render('user', { name: 'Tobi' }, (err, html) => {
  // ...
})