Question

我收到了不赞成使用的错误消息正文解析器，我在查找有关解析数据的其他方法，但似乎都没有用。下面的代码我得到了什么

const express = require('express');

const app = express();

const Task = require('./api/models/ListModels.js'); //created model loading here

const bodyParser = require('body-parser');

const mongoose = require('mongoose');

// mongoose instance connection url connection


mongoose.Promise = global.Promise;
mongoose.connect('mongodb://localhost/Tododb'); 

app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());

const routes = require('./api/routes/ListRoutes.js'); //importing route
routes(app); //register the route

app.listen(3000, () => {
    console.log('running on 3000')
    })

错误：

PS C:\Users\demar\Desktop\New folder\ListAPI> node app.js
(node:10424) DeprecationWarning: current URL string parser is deprecated, and will be removed in a future version. To use the new parser, pass option { useNewUrlParser: true } to MongoClient.connect.
running on 3000
(node:10424) UnhandledPromiseRejectionWarning: MongoNetworkError: failed to connect to server [localhost:27017] on first connect [MongoNetworkError: connect ECONNREFUSED 127.0.0.1:27017]
    at Pool.<anonymous> (C:\Users\demar\Desktop\New folder\ListAPI\node_modules\mongodb-core\lib\topologies\server.js:562:11)
    at emitOne (events.js:116:13)
    at Pool.emit (events.js:211:7)
    at Connection.<anonymous> (C:\Users\demar\Desktop\New folder\ListAPI\node_modules\mongodb-core\lib\connection\pool.js:316:12)
    at Object.onceWrapper (events.js:317:30)
    at emitTwo (events.js:126:13)
    at Connection.emit (events.js:214:7)
    at Socket.<anonymous> (C:\Users\demar\Desktop\New folder\ListAPI\node_modules\mongodb-core\lib\connection\connection.js:245:50)
    at Object.onceWrapper (events.js:315:30)
    at emitOne (events.js:116:13)
    at Socket.emit (events.js:211:7)
    at emitErrorNT (internal/streams/destroy.js:64:8)
    at _combinedTickCallback (internal/process/next_tick.js:138:11)
    at process._tickCallback (internal/process/next_tick.js:180:9)
(node:10424) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without
a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:10424) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

Answer 1

它诚实地告诉您该怎么做。

To use the new parser, pass option { useNewUrlParser: true } to MongoClient.connect.

我添加了选项，并且效果很好。

最初：

// Connect to Mongo:
mongoose.connect(db).then(() => console.log("Mongo DB Connected")).catch(err => console.log(err));

当前：

// Connect to Mongo:
mongoose.connect(db, { useNewUrlParser: true}).then(() => console.log("Mongo DB Connected")).catch(err => console.log(err));

此问题已解决

Answer 2

错误是，Mongoose使用的Node URL字符串解析器的版本已过时。

将选项{useNewUrlParser: true}传递给mongoose.connect()，以使用新的Node Core URL API。

mongoose.connect('mongodb://localhost/Tododb', {useNewUrlParser: true})

Answer 3

出现此错误是因为您未指定运行mongodb的端口号。

mongoose.connect('mongodb://localhost:27017/databasename', { useNewUrlParser: true })

这将解决您的问题：）

Answer 4

是的，body-parser 已被弃用。

不要再用了

从 Express 4.16+ 开始，正文解析功能已经内置到 express 中

你可以做到

app.use(express.urlencoded({extended: true}));
app.use(express.json()) // To parse the incoming requests with JSON payloads

直接来自express，无需安装body-parser。

因此您可以使用 npm uninstall body-parser 卸载 body-parser，只需使用上面的 express 代码即可。

不建议使用的人体分析器？

4 个答案: