[node.js] 오류 : 기본 엔진이 지정되지 않았으며 확장이 제공되지 않았습니다

node.js와 엔진을 사용하여 http 서버를 설정하는 중입니다. 그러나 해결 방법에 대한 정보가 거의없는 문제가 계속 발생 하므로이 문제를 해결하는 데 도움이 될 것입니다.

Error: No default engine was specified and no extension was provided.
at new View (...\node_modules\express\lib\view.js:41:42)
at Function.app.render (...\node_modules\express\lib\application.js:484:12)
at ServerResponse.res.render (...\node_modules\express\lib\response.js:783:7)
at Layer.handle (...\app.js:123:7)
at trim_prefix (...\node_modules\express\lib\router\index.js:225:17)
at c (...\node_modules\express\lib\router\index.js:198:9)
at Function.proto.process_params (...\node_modules\express\lib\router\index.js:253:12)
at next (...\node_modules\express\lib\router\index.js:189:19)
at next (...\node_modules\express\lib\router\index.js:202:7)
at next (...\node_modules\express\lib\router\index.js:166:38)

아래는이 엔진을 시작하기 위해 설정 한 내용입니다.

var http = require('http');
var module = require("module")
var logger = require('morgan');
var express = require('express');
var app =  module.exports = express();
var silent = 'test' == process.env.NODE_ENV;
var httpServer = http.createServer(app);  // app middleware

app.enable('strict routing');
// app.all('*', function(req, res, next)/*** CORS support.*/
// {
//   if (!req.get('Origin')) return next();// use "*" here to accept any origin
//   res.set('Access-Control-Allow-Origin', 'http://localhost:3000');
//   res.set('Access-Control-Allow-Methods', 'GET, POST');
//   res.set('Access-Control-Allow-Headers', 'X-Requested-With, Content-Type');
//   res.set('Access-Control-Allow-Max-Age', 3600);
//   if ('OPTIONS' == req.method) return res.send(200);
//   next();
// });
app.set('views', __dirname + '/views'); // general config
app.set('view engine', 'html');
app.get('/404', function(req, res, next){
next();// trigger a 404 since no other middleware will match /404 after this one, and we're not responding here
});
app.get('/403', function(req, res, next){// trigger a 403 error
  var err = new Error('not allowed!');
  err.status = 403;
  next(err);
});
app.get('/500', function(req, res, next){// trigger a generic (500) error
  next(new Error('keyboard cat!'));
});
app.use(express.static(__dirname + '/public'));
//error handlers
app.use(logErrors);
app.use(clientErrorHandler);
app.use(errorHandler);
// middleware with an arity of 4 are considered error handling middleware. When you next(err)
// it will be passed through the defined middleware in order, but ONLY those with an arity of 4, ignoring regular middleware.
function clientErrorHandler(err, req, res, next) {
  if (req.xhr) {// whatever you want here, feel free to populate properties on `err` to treat it differently in here.
  res.send(err.status || 500, { error: err.message });
  }
  else
  { next(err);}
};
// create an error with .status. we can then use the property in our custom error handler (Connect repects this prop as well)
function error  (status, msg) {
  var err = new Error(msg);
  err.status = status;
  return err;
};
function logErrors  (err, req, res, next) {
  console.error(err.stack);
  next(err);
};
function errorHandler (err, req, res, next) {
  res.status(500);
  res.render('error', { error: err });
};

// Error handlers
// Since this is the last non-error-handling middleware use()d, we assume 404, as nothing else responded.
// $ curl http://localhost:3000/notfound
// $ curl http://localhost:3000/notfound -H "Accept: application/json"
// $ curl http://localhost:3000/notfound -H "Accept: text/plain"
app.use(function(req, res, next){
  res.status(404);
  if (req.accepts('html')) {// respond with html page
    res.render('404', { url: req.url });
    return;
  }
  if (req.accepts('json')) {// respond with json
    res.send({ error: 'Not found' });
    return;
  }
  res.type('txt').send('Not found');// default to plain-text. send()
});

// error-handling middleware, take the same form as regular middleware, however they require an
// arity of 4, aka the signature (err, req, res, next).when connect has an error, it will invoke ONLY error-handling middleware.

// If we were to next() here any remaining non-error-handling middleware would then be executed, or if we next(err) to
// continue passing the error, only error-handling middleware would remain being executed, however here
// we simply respond with an error page.
app.use(function(err, req, res, next){
  // we may use properties of the error object here and next(err) appropriately, or if we possibly recovered from the error, simply next().
  res.status(err.status || 500);
  res.render('500', { error: err });
});

if (!module.parent) {// assigning to exports will not modify module, must use module.exports
  app.listen(3000);
  silent || console.log('Express started on port 3000');
};

답변

res.json({ error: err })

res.status(err.status || 500);
res.json({
  message: err.message,
  error: err
});

app.set('view engine', 'html');

app.set('view engine', 'jade');

app.engine('html', require('ejs').renderFile);
app.set('view engine', 'html');

module.exports = View;

/**
 * Initialize a new `View` with the given `name`.
 *
 * Options:
 *
 *   - `defaultEngine` the default template engine name
 *   - `engines` template engine require() cache
 *   - `root` root path for view lookup
 *
 * @param {String} name
 * @param {Object} options
 * @api private
 */

function View(name, options) {
  options = options || {};
  this.name = name;
  this.root = options.root;
  var engines = options.engines;
  this.defaultEngine = options.defaultEngine;
  var ext = this.ext = extname(name);
  if (!ext && !this.defaultEngine) throw new Error('No default engine was specified and no extension was provided.');
  if (!ext) name += (ext = this.ext = ('.' != this.defaultEngine[0] ? '.' : '') + this.defaultEngine);
  this.engine = engines[ext] || (engines[ext] = require(ext.slice(1)).__express);
  this.path = this.lookup(name);
}

mkdir(path + '/views', function(){
      switch (program.template) {
        case 'ejs':
          write(path + '/views/index.ejs', ejsIndex);
          break;
        case 'jade':
          write(path + '/views/layout.jade', jadeLayout);
          write(path + '/views/index.jade', jadeIndex);
          break;
        case 'jshtml':
          write(path + '/views/layout.jshtml', jshtmlLayout);
          write(path + '/views/index.jshtml', jshtmlIndex);
          break;
        case 'hjs':
          write(path + '/views/index.hjs', hoganIndex);
          break;

      }
    });

program.template = 'jade';
if (program.ejs) program.template = 'ejs';
if (program.jshtml) program.template = 'jshtml';
if (program.hogan) program.template = 'hjs';

app.set('view engine', 'html');

app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');
//swap jade for ejs etc

// error handlers
// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
  app.use(function(err, req, res, next) {
    res.status(err.status || 500);
    res.render('error', {
    message: err.message,
    error: err
    });
  });
}
// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
  res.status(err.status || 500);
  next(err);
  res.render('error', {
  message: err.message,
  error: {}
  });
});

response.sendfile('index.html');

app.set('view engine', 'html');

app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

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

var express = require('express');
var morgan = require('morgan');
var session = require('express-session');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');

module.exports = function (app) {
app.use(morgan('dev'));

// Good for now
// In the future, use connect-mongo or similar
// for persistant sessions
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({
    extended: true
}));
app.use(cookieParser());
app.use(session({secret: 'building a blog', saveUninitialized: true, resave: true}));

"dependencies": {
    "body-parser": "1.12.3",
    "consolidate": "0.12.1",
    "cookie-parser": "1.3.4",
    "crypto": "0.0.3",
    "debug": "2.1.1",
    "express": "4.12.2",
    "express-mongoose": "0.1.0",
    "express-session": "1.11.1",
    "jade": "1.9.2",
    "method-override": "2.3.2",
    "mongodb": "2.0.28",
    "mongoose": "4.0.2",
    "morgan": "1.5.1",
    "request": "2.55.0",
    "serve-favicon": "2.2.0",
    "swig": "1.4.2"
  }