错误：没有指定默认引擎，也没有提供扩展。在新的查看 MEAN 堆栈答案

【问题标题】：Error: No default engine was specified and no extension was provided. at new View MEAN stack错误：没有指定默认引擎，也没有提供扩展。在新的查看 MEAN 堆栈
【发布时间】：2019-02-24 10:51:45
【问题描述】：

所以我正在关注本指南MEAN STACK GUIDE

我在 2 号时遇到错误

我自己无法解决，因为我是学习平均堆栈的新手

这里有什么帮助吗？

顺便说一下，这是完整的错误

Error: No default engine was specified and no extension was provided.
    at new View (/Users/angelocolmenares/Desktop/Carwash/mean-secure/node_modules/express/lib/view.js:61:11)
    at Function.render (/Users/angelocolmenares/Desktop/Carwash/mean-secure/node_modules/express/lib/application.js:570:12)
    at ServerResponse.render (/Users/angelocolmenares/Desktop/Carwash/mean-secure/node_modules/express/lib/response.js:1008:7)
    at /Users/angelocolmenares/Desktop/Carwash/mean-secure/app.js:32:7
    at Layer.handle_error (/Users/angelocolmenares/Desktop/Carwash/mean-secure/node_modules/express/lib/router/layer.js:71:5)
    at trim_prefix (/Users/angelocolmenares/Desktop/Carwash/mean-secure/node_modules/express/lib/router/index.js:315:13)
    at /Users/angelocolmenares/Desktop/Carwash/mean-secure/node_modules/express/lib/router/index.js:284:7
    at Function.process_params (/Users/angelocolmenares/Desktop/Carwash/mean-secure/node_modules/express/lib/router/index.js:335:12)
    at next (/Users/angelocolmenares/Desktop/Carwash/mean-secure/node_modules/express/lib/router/index.js:275:10)
    at /Users/angelocolmenares/Desktop/Carwash/mean-secure/app.js:21:3
GET /favicon.ico 404 1.584 ms - 1428
Error: No default engine was specified and no extension was provided.
    at new View (/Users/angelocolmenares/Desktop/Carwash/mean-secure/node_modules/express/lib/view.js:61:11)
    at Function.render (/Users/angelocolmenares/Desktop/Carwash/mean-secure/node_modules/express/lib/application.js:570:12)
    at ServerResponse.render (/Users/angelocolmenares/Desktop/Carwash/mean-secure/node_modules/express/lib/response.js:1008:7)
    at /Users/angelocolmenares/Desktop/Carwash/mean-secure/app.js:32:7
    at Layer.handle_error (/Users/angelocolmenares/Desktop/Carwash/mean-secure/node_modules/express/lib/router/layer.js:71:5)
    at trim_prefix (/Users/angelocolmenares/Desktop/Carwash/mean-secure/node_modules/express/lib/router/index.js:315:13)
    at /Users/angelocolmenares/Desktop/Carwash/mean-secure/node_modules/express/lib/router/index.js:284:7
    at Function.process_params (/Users/angelocolmenares/Desktop/Carwash/mean-secure/node_modules/express/lib/router/index.js:335:12)
    at next (/Users/angelocolmenares/Desktop/Carwash/mean-secure/node_modules/express/lib/router/index.js:275:10)
    at /Users/angelocolmenares/Desktop/Carwash/mean-secure/app.js:21:3
GET / 404 0.999 ms - 1428
Error: No default engine was specified and no extension was provided.
    at new View (/Users/angelocolmenares/Desktop/Carwash/mean-secure/node_modules/express/lib/view.js:61:11)
    at Function.render (/Users/angelocolmenares/Desktop/Carwash/mean-secure/node_modules/express/lib/application.js:570:12)
    at ServerResponse.render (/Users/angelocolmenares/Desktop/Carwash/mean-secure/node_modules/express/lib/response.js:1008:7)
    at /Users/angelocolmenares/Desktop/Carwash/mean-secure/app.js:32:7
    at Layer.handle_error (/Users/angelocolmenares/Desktop/Carwash/mean-secure/node_modules/express/lib/router/layer.js:71:5)
    at trim_prefix (/Users/angelocolmenares/Desktop/Carwash/mean-secure/node_modules/express/lib/router/index.js:315:13)
    at /Users/angelocolmenares/Desktop/Carwash/mean-secure/node_modules/express/lib/router/index.js:284:7
    at Function.process_params (/Users/angelocolmenares/Desktop/Carwash/mean-secure/node_modules/express/lib/router/index.js:335:12)
    at next (/Users/angelocolmenares/Desktop/Carwash/mean-secure/node_modules/express/lib/router/index.js:275:10)
    at /Users/angelocolmenares/Desktop/Carwash/mean-secure/app.js:21:3

【问题讨论】：

标签： node.js express mean-stack mean

【解决方案1】：

您尚未在routes/api.js 中定义任何路由。所以现在你有localhost:3000/api，这是唯一可以访问的路线。

另外，由于 app.js 中的第 31 行，您会收到 No default engine was specified and no extension was provided. 错误，因为您想在点击 localhost:3000/api/profile 时呈现错误页面。您没有任何与此路线匹配的路线。您可以通过将这些行更改为：

 // error handler
app.use(function(err, req, res, next) {
 // set locals, only providing error in development
 res.locals.message = err.message;
 res.locals.error = req.app.get('env') === 'development' ? err : {};


 // render the error page 
 res.status(err.status || 500)
 res.send({ 'error': 'no route found!' });
});

有关render的更多详细信息，请阅读：documentation

【讨论】：