Error: No default engine was specified and no extension was provided

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I am working through setting up a http server using node.js and engine. However, I keep running into issues that I have little information on how to resolve I would apprecia

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盖世英雄少女心

2020-11-29 18:21
You can use express-error-handler to use static html pages for error handling and to avoid defining a view handler.

The error was probably caused by a 404, maybe a missing favicon (apparent if you had included the previous console message). The 'view handler' of 'html' doesn't seem to be valid in 4.x express.

Regardless of the cause, you can avoid defining a (valid) view handler as long as you modify additional elements of your configuration.

Your options are to fix this problem are:
- Define a valid view handler as in other answers
- Use send() instead of render to return the content directly
http://expressjs.com/en/api.html#res.render

Using render without a filepath automatically invokes a view handler as with the following two lines from your configuration:
```
res.render('404', { url: req.url });
```
and:
```
res.render('500);
```
Make sure you install express-error-handler with:
```
npm install --save express-error-handler
```
Then import it in your app.js
```
var ErrorHandler = require('express-error-handler');
```
Then change your error handling to use:
```
// define below all other routes
var errorHandler = ErrorHandler({
  static: {
    '404': 'error.html' // put this file in your Public folder
    '500': 'error.html' // ditto
});

// any unresolved requests will 404
app.use(function(req,res,next) {
  var err = new Error('Not Found');
  err.status(404);
  next(err);
}

app.use(errorHandler);
```
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萌比男神i

2020-11-29 18:27

Please replace ===== app.set('view engin', 'html'); with app.set('view engine', 'ejs');

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轮回少年

2020-11-29 18:27
if you've got this error by using the express generator, I've solved it by using
```
express --view=ejs myapp
```
instead of
```
express --view=pug myapp
```
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小鲜肉

2020-11-29 18:29
The res.render stuff will throw an error if you're not using a view engine.

If you just want to serve json replace the res.render('error', { error: err }); lines in your code with:
```
res.json({ error: err })
```
PS: People usually also have message in the returned object:
```
res.status(err.status || 500);
res.json({
  message: err.message,
  error: err
});
```
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太阳男子

2020-11-29 18:33
Just set view engine in your code.
```
var app = express(); 
app.set('view engine', 'ejs');
```
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南旧

2020-11-29 18:35

If all that's needed is to send html code inline in the code, we can use below

var app = express();
app.get('/test.html', function (req, res) {
   res.header('Content-Type', 'text/html').send("<html>my html code</html>");
});

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