Node.js - 如何检查请求数据？

Question

我有一个Node.js路由，它发回一些文本并记录请求：

app.post('/registerUser', function (req, res) {
  res.send('Hello World post!')
  console.log(req);
})

然后我用curl打了那条路，就像这样：

curl --data "username==test&foo==bar" http://localhost:3000/registerUser

这就是我通过节点获取的内容：

IncomingMessage {
  _readableState:
   ReadableState {
     objectMode: false,
     highWaterMark: 16384,
     buffer: BufferList { head: null, tail: null, length: 0 },
     length: 0,
     pipes: null,
     pipesCount: 0,
     flowing: null,
     ended: false,
     endEmitted: false,
     reading: false,
     sync: true,
     needReadable: false,
     emittedReadable: false,
     readableListening: false,
     resumeScheduled: false,
     defaultEncoding: 'utf8',
     ranOut: false,
     awaitDrain: 0,
     readingMore: true,
     decoder: null,
     encoding: null },
  readable: true,
  domain: null,
  _events: {},
  _eventsCount: 0,
  _maxListeners: undefined,
  socket:
   Socket {
     connecting: false,
     _hadError: false,
     _handle:
      TCP {
        bytesRead: 183,
        _externalStream: {},
        fd: 14,
        reading: true,
        owner: [Circular],
        onread: [Function: onread],
        onconnection: null,
        writeQueueSize: 0 },
     _parent: null,
     _host: null,
     _readableState:
      ReadableState {
        objectMode: false,
        highWaterMark: 16384,
        buffer: [Object],
        length: 0,
        pipes: null,
        pipesCount: 0,
        flowing: true,
        ended: false,
        endEmitted: false,
        reading: true,
        sync: false,
        needReadable: true,
        emittedReadable: false,
        readableListening: false,
        resumeScheduled: false,
        defaultEncoding: 'utf8',
        ranOut: false,
        awaitDrain: 0,
        readingMore: false,
        decoder: null,
        encoding: null },
     readable: true,
     domain: null,
     _events:
      { end: [Object],
        finish: [Function: onSocketFinish],
        _socketEnd: [Function: onSocketEnd],
        drain: [Object],
        timeout: [Function],
        error: [Function: socketOnError],
        close: [Object],
        data: [Function: socketOnData],
        resume: [Function: onSocketResume],
        pause: [Function: onSocketPause] },
     _eventsCount: 10,
     _maxListeners: undefined,
     _writableState:
      WritableState {
        objectMode: false,
        highWaterMark: 16384,
        needDrain: false,
        ending: false,
        ended: false,
        finished: false,
        decodeStrings: false,
        defaultEncoding: 'utf8',
        length: 0,
        writing: false,
        corked: 0,
        sync: false,
        bufferProcessing: false,
        onwrite: [Function],
        writecb: null,
        writelen: 0,
        bufferedRequest: null,
        lastBufferedRequest: null,
        pendingcb: 3,
        prefinished: false,
        errorEmitted: false,
        bufferedRequestCount: 0,
        corkedRequestsFree: [Object] },
     writable: true,
     allowHalfOpen: true,
     destroyed: false,
     _bytesDispatched: 222,
     _sockname: null,
     _pendingData: null,
     _pendingEncoding: '',
     server:
      Server {
        domain: null,
        _events: [Object],
        _eventsCount: 2,
        _maxListeners: undefined,
        _connections: 1,
        _handle: [Object],
        _usingSlaves: false,
        _slaves: [],
        _unref: false,
        allowHalfOpen: true,
        pauseOnConnect: false,
        httpAllowHalfOpen: false,
        timeout: 120000,
        _pendingResponseData: 0,
        _connectionKey: '6::::3000' },
     _server:
      Server {
        domain: null,
        _events: [Object],
        _eventsCount: 2,
        _maxListeners: undefined,
        _connections: 1,
        _handle: [Object],
        _usingSlaves: false,
        _slaves: [],
        _unref: false,
        allowHalfOpen: true,
        pauseOnConnect: false,
        httpAllowHalfOpen: false,
        timeout: 120000,
        _pendingResponseData: 0,
        _connectionKey: '6::::3000' },
     _idleTimeout: 120000,
     _idleNext:
      TimersList {
        _idleNext: [Circular],
        _idlePrev: [Circular],
        _timer: [Object],
        _unrefed: true,
        msecs: 120000 },
     _idlePrev:
      TimersList {
        _idleNext: [Circular],
        _idlePrev: [Circular],
        _timer: [Object],
        _unrefed: true,
        msecs: 120000 },
     _idleStart: 144720,
     parser:
      HTTPParser {
        '0': [Function: parserOnHeaders],
        '1': [Function: parserOnHeadersComplete],
        '2': [Function: parserOnBody],
        '3': [Function: parserOnMessageComplete],
        '4': [Function: onParserExecute],
        _headers: [],
        _url: '',
        _consumed: true,
        socket: [Circular],
        incoming: [Circular],
        outgoing: null,
        maxHeaderPairs: 2000,
        onIncoming: [Function: parserOnIncoming] },
     on: [Function: socketOnWrap],
     _paused: false,
     read: [Function],
     _consuming: true,
     _httpMessage:
      ServerResponse {
        domain: null,
        _events: [Object],
        _eventsCount: 1,
        _maxListeners: undefined,
        output: [],
        outputEncodings: [],
        outputCallbacks: [],
        outputSize: 0,
        writable: true,
        _last: false,
        upgrading: false,
        chunkedEncoding: false,
        shouldKeepAlive: true,
        useChunkedEncodingByDefault: true,
        sendDate: true,
        _removedHeader: [Object],
        _contentLength: 17,
        _hasBody: true,
        _trailer: '',
        finished: true,
        _headerSent: true,
        socket: [Circular],
        connection: [Circular],
        _header: 'HTTP/1.1 200 OK\r\nX-Powered-By: Express\r\nContent-Type: text/html; charset=utf-8\r\nContent-Length: 17\r\nETag: W/"11-5i2g3OJs8No9M8PUhnLubxYJmZY"\r\nDate: Fri, 28 Apr 2017 00:06:49 GMT\r\nConnection: keep-alive\r\n\r\n',
        _headers: [Object],
        _headerNames: [Object],
        _onPendingData: [Function: updateOutgoingData],
        req: [Circular],
        locals: {},
        statusMessage: 'OK',
        statusCode: 200 } },
  connection:
   Socket {
     connecting: false,
     _hadError: false,
     _handle:
      TCP {
        bytesRead: 183,
        _externalStream: {},
        fd: 14,
        reading: true,
        owner: [Circular],
        onread: [Function: onread],
        onconnection: null,
        writeQueueSize: 0 },
     _parent: null,
     _host: null,
     _readableState:
      ReadableState {
        objectMode: false,
        highWaterMark: 16384,
        buffer: [Object],
        length: 0,
        pipes: null,
        pipesCount: 0,
        flowing: true,
        ended: false,
        endEmitted: false,
        reading: true,
        sync: false,
        needReadable: true,
        emittedReadable: false,
        readableListening: false,
        resumeScheduled: false,
        defaultEncoding: 'utf8',
        ranOut: false,
        awaitDrain: 0,
        readingMore: false,
        decoder: null,
        encoding: null },
     readable: true,
     domain: null,
     _events:
      { end: [Object],
        finish: [Function: onSocketFinish],
        _socketEnd: [Function: onSocketEnd],
        drain: [Object],
        timeout: [Function],
        error: [Function: socketOnError],
        close: [Object],
        data: [Function: socketOnData],
        resume: [Function: onSocketResume],
        pause: [Function: onSocketPause] },
     _eventsCount: 10,
     _maxListeners: undefined,
     _writableState:
      WritableState {
        objectMode: false,
        highWaterMark: 16384,
        needDrain: false,
        ending: false,
        ended: false,
        finished: false,
        decodeStrings: false,
        defaultEncoding: 'utf8',
        length: 0,
        writing: false,
        corked: 0,
        sync: false,
        bufferProcessing: false,
        onwrite: [Function],
        writecb: null,
        writelen: 0,
        bufferedRequest: null,
        lastBufferedRequest: null,
        pendingcb: 3,
        prefinished: false,
        errorEmitted: false,
        bufferedRequestCount: 0,
        corkedRequestsFree: [Object] },
     writable: true,
     allowHalfOpen: true,
     destroyed: false,
     _bytesDispatched: 222,
     _sockname: null,
     _pendingData: null,
     _pendingEncoding: '',
     server:
      Server {
        domain: null,
        _events: [Object],
        _eventsCount: 2,
        _maxListeners: undefined,
        _connections: 1,
        _handle: [Object],
        _usingSlaves: false,
        _slaves: [],
        _unref: false,
        allowHalfOpen: true,
        pauseOnConnect: false,
        httpAllowHalfOpen: false,
        timeout: 120000,
        _pendingResponseData: 0,
        _connectionKey: '6::::3000' },
     _server:
      Server {
        domain: null,
        _events: [Object],
        _eventsCount: 2,
        _maxListeners: undefined,
        _connections: 1,
        _handle: [Object],
        _usingSlaves: false,
        _slaves: [],
        _unref: false,
        allowHalfOpen: true,
        pauseOnConnect: false,
        httpAllowHalfOpen: false,
        timeout: 120000,
        _pendingResponseData: 0,
        _connectionKey: '6::::3000' },
     _idleTimeout: 120000,
     _idleNext:
      TimersList {
        _idleNext: [Circular],
        _idlePrev: [Circular],
        _timer: [Object],
        _unrefed: true,
        msecs: 120000 },
     _idlePrev:
      TimersList {
        _idleNext: [Circular],
        _idlePrev: [Circular],
        _timer: [Object],
        _unrefed: true,
        msecs: 120000 },
     _idleStart: 144720,
     parser:
      HTTPParser {
        '0': [Function: parserOnHeaders],
        '1': [Function: parserOnHeadersComplete],
        '2': [Function: parserOnBody],
        '3': [Function: parserOnMessageComplete],
        '4': [Function: onParserExecute],
        _headers: [],
        _url: '',
        _consumed: true,
        socket: [Circular],
        incoming: [Circular],
        outgoing: null,
        maxHeaderPairs: 2000,
        onIncoming: [Function: parserOnIncoming] },
     on: [Function: socketOnWrap],
     _paused: false,
     read: [Function],
     _consuming: true,
     _httpMessage:
      ServerResponse {
        domain: null,
        _events: [Object],
        _eventsCount: 1,
        _maxListeners: undefined,
        output: [],
        outputEncodings: [],
        outputCallbacks: [],
        outputSize: 0,
        writable: true,
        _last: false,
        upgrading: false,
        chunkedEncoding: false,
        shouldKeepAlive: true,
        useChunkedEncodingByDefault: true,
        sendDate: true,
        _removedHeader: [Object],
        _contentLength: 17,
        _hasBody: true,
        _trailer: '',
        finished: true,
        _headerSent: true,
        socket: [Circular],
        connection: [Circular],
        _header: 'HTTP/1.1 200 OK\r\nX-Powered-By: Express\r\nContent-Type: text/html; charset=utf-8\r\nContent-Length: 17\r\nETag: W/"11-5i2g3OJs8No9M8PUhnLubxYJmZY"\r\nDate: Fri, 28 Apr 2017 00:06:49 GMT\r\nConnection: keep-alive\r\n\r\n',
        _headers: [Object],
        _headerNames: [Object],
        _onPendingData: [Function: updateOutgoingData],
        req: [Circular],
        locals: {},
        statusMessage: 'OK',
        statusCode: 200 } },
  httpVersionMajor: 1,
  httpVersionMinor: 1,
  httpVersion: '1.1',
  complete: false,
  headers:
   { host: 'localhost:3000',
     'user-agent': 'curl/7.43.0',
     accept: '*/*',
     'content-length': '23',
     'content-type': 'application/x-www-form-urlencoded' },
  rawHeaders:
   [ 'Host',
     'localhost:3000',
     'User-Agent',
     'curl/7.43.0',
     'Accept',
     '*/*',
     'Content-Length',
     '23',
     'Content-Type',
     'application/x-www-form-urlencoded' ],
  trailers: {},
  rawTrailers: [],
  upgrade: false,
  url: '/registerUser',
  method: 'POST',
  statusCode: null,
  statusMessage: null,
  client:
   Socket {
     connecting: false,
     _hadError: false,
     _handle:
      TCP {
        bytesRead: 183,
        _externalStream: {},
        fd: 14,
        reading: true,
        owner: [Circular],
        onread: [Function: onread],
        onconnection: null,
        writeQueueSize: 0 },
     _parent: null,
     _host: null,
     _readableState:
      ReadableState {
        objectMode: false,
        highWaterMark: 16384,
        buffer: [Object],
        length: 0,
        pipes: null,
        pipesCount: 0,
        flowing: true,
        ended: false,
        endEmitted: false,
        reading: true,
        sync: false,
        needReadable: true,
        emittedReadable: false,
        readableListening: false,
        resumeScheduled: false,
        defaultEncoding: 'utf8',
        ranOut: false,
        awaitDrain: 0,
        readingMore: false,
        decoder: null,
        encoding: null },
     readable: true,
     domain: null,
     _events:
      { end: [Object],
        finish: [Function: onSocketFinish],
        _socketEnd: [Function: onSocketEnd],
        drain: [Object],
        timeout: [Function],
        error: [Function: socketOnError],
        close: [Object],
        data: [Function: socketOnData],
        resume: [Function: onSocketResume],
        pause: [Function: onSocketPause] },
     _eventsCount: 10,
     _maxListeners: undefined,
     _writableState:
      WritableState {
        objectMode: false,
        highWaterMark: 16384,
        needDrain: false,
        ending: false,
        ended: false,
        finished: false,
        decodeStrings: false,
        defaultEncoding: 'utf8',
        length: 0,
        writing: false,
        corked: 0,
        sync: false,
        bufferProcessing: false,
        onwrite: [Function],
        writecb: null,
        writelen: 0,
        bufferedRequest: null,
        lastBufferedRequest: null,
        pendingcb: 3,
        prefinished: false,
        errorEmitted: false,
        bufferedRequestCount: 0,
        corkedRequestsFree: [Object] },
     writable: true,
     allowHalfOpen: true,
     destroyed: false,
     _bytesDispatched: 222,
     _sockname: null,
     _pendingData: null,
     _pendingEncoding: '',
     server:
      Server {
        domain: null,
        _events: [Object],
        _eventsCount: 2,
        _maxListeners: undefined,
        _connections: 1,
        _handle: [Object],
        _usingSlaves: false,
        _slaves: [],
        _unref: false,
        allowHalfOpen: true,
        pauseOnConnect: false,
        httpAllowHalfOpen: false,
        timeout: 120000,
        _pendingResponseData: 0,
        _connectionKey: '6::::3000' },
     _server:
      Server {
        domain: null,
        _events: [Object],
        _eventsCount: 2,
        _maxListeners: undefined,
        _connections: 1,
        _handle: [Object],
        _usingSlaves: false,
        _slaves: [],
        _unref: false,
        allowHalfOpen: true,
        pauseOnConnect: false,
        httpAllowHalfOpen: false,
        timeout: 120000,
        _pendingResponseData: 0,
        _connectionKey: '6::::3000' },
     _idleTimeout: 120000,
     _idleNext:
      TimersList {
        _idleNext: [Circular],
        _idlePrev: [Circular],
        _timer: [Object],
        _unrefed: true,
        msecs: 120000 },
     _idlePrev:
      TimersList {
        _idleNext: [Circular],
        _idlePrev: [Circular],
        _timer: [Object],
        _unrefed: true,
        msecs: 120000 },
     _idleStart: 144720,
     parser:
      HTTPParser {
        '0': [Function: parserOnHeaders],
        '1': [Function: parserOnHeadersComplete],
        '2': [Function: parserOnBody],
        '3': [Function: parserOnMessageComplete],
        '4': [Function: onParserExecute],
        _headers: [],
        _url: '',
        _consumed: true,
        socket: [Circular],
        incoming: [Circular],
        outgoing: null,
        maxHeaderPairs: 2000,
        onIncoming: [Function: parserOnIncoming] },
     on: [Function: socketOnWrap],
     _paused: false,
     read: [Function],
     _consuming: true,
     _httpMessage:
      ServerResponse {
        domain: null,
        _events: [Object],
        _eventsCount: 1,
        _maxListeners: undefined,
        output: [],
        outputEncodings: [],
        outputCallbacks: [],
        outputSize: 0,
        writable: true,
        _last: false,
        upgrading: false,
        chunkedEncoding: false,
        shouldKeepAlive: true,
        useChunkedEncodingByDefault: true,
        sendDate: true,
        _removedHeader: [Object],
        _contentLength: 17,
        _hasBody: true,
        _trailer: '',
        finished: true,
        _headerSent: true,
        socket: [Circular],
        connection: [Circular],
        _header: 'HTTP/1.1 200 OK\r\nX-Powered-By: Express\r\nContent-Type: text/html; charset=utf-8\r\nContent-Length: 17\r\nETag: W/"11-5i2g3OJs8No9M8PUhnLubxYJmZY"\r\nDate: Fri, 28 Apr 2017 00:06:49 GMT\r\nConnection: keep-alive\r\n\r\n',
        _headers: [Object],
        _headerNames: [Object],
        _onPendingData: [Function: updateOutgoingData],
        req: [Circular],
        locals: {},
        statusMessage: 'OK',
        statusCode: 200 } },
  _consuming: false,
  _dumped: false,
  next: [Function: next],
  baseUrl: '',
  originalUrl: '/registerUser',
  _parsedUrl:
   Url {
     protocol: null,
     slashes: null,
     auth: null,
     host: null,
     port: null,
     hostname: null,
     hash: null,
     search: null,
     query: null,
     pathname: '/registerUser',
     path: '/registerUser',
     href: '/registerUser',
     _raw: '/registerUser' },
  params: {},
  query: {},
  res:
   ServerResponse {
     domain: null,
     _events: { finish: [Function: resOnFinish] },
     _eventsCount: 1,
     _maxListeners: undefined,
     output: [],
     outputEncodings: [],
     outputCallbacks: [],
     outputSize: 0,
     writable: true,
     _last: false,
     upgrading: false,
     chunkedEncoding: false,
     shouldKeepAlive: true,
     useChunkedEncodingByDefault: true,
     sendDate: true,
     _removedHeader: { 'content-length': false },
     _contentLength: 17,
     _hasBody: true,
     _trailer: '',
     finished: true,
     _headerSent: true,
     socket:
      Socket {
        connecting: false,
        _hadError: false,
        _handle: [Object],
        _parent: null,
        _host: null,
        _readableState: [Object],
        readable: true,
        domain: null,
        _events: [Object],
        _eventsCount: 10,
        _maxListeners: undefined,
        _writableState: [Object],
        writable: true,
        allowHalfOpen: true,
        destroyed: false,
        _bytesDispatched: 222,
        _sockname: null,
        _pendingData: null,
        _pendingEncoding: '',
        server: [Object],
        _server: [Object],
        _idleTimeout: 120000,
        _idleNext: [Object],
        _idlePrev: [Object],
        _idleStart: 144720,
        parser: [Object],
        on: [Function: socketOnWrap],
        _paused: false,
        read: [Function],
        _consuming: true,
        _httpMessage: [Circular] },
     connection:
      Socket {
        connecting: false,
        _hadError: false,
        _handle: [Object],
        _parent: null,
        _host: null,
        _readableState: [Object],
        readable: true,
        domain: null,
        _events: [Object],
        _eventsCount: 10,
        _maxListeners: undefined,
        _writableState: [Object],
        writable: true,
        allowHalfOpen: true,
        destroyed: false,
        _bytesDispatched: 222,
        _sockname: null,
        _pendingData: null,
        _pendingEncoding: '',
        server: [Object],
        _server: [Object],
        _idleTimeout: 120000,
        _idleNext: [Object],
        _idlePrev: [Object],
        _idleStart: 144720,
        parser: [Object],
        on: [Function: socketOnWrap],
        _paused: false,
        read: [Function],
        _consuming: true,
        _httpMessage: [Circular] },
     _header: 'HTTP/1.1 200 OK\r\nX-Powered-By: Express\r\nContent-Type: text/html; charset=utf-8\r\nContent-Length: 17\r\nETag: W/"11-5i2g3OJs8No9M8PUhnLubxYJmZY"\r\nDate: Fri, 28 Apr 2017 00:06:49 GMT\r\nConnection: keep-alive\r\n\r\n',
     _headers:
      { 'x-powered-by': 'Express',
        'content-type': 'text/html; charset=utf-8',
        'content-length': '17',
        etag: 'W/"11-5i2g3OJs8No9M8PUhnLubxYJmZY"' },
     _headerNames:
      { 'x-powered-by': 'X-Powered-By',
        'content-type': 'Content-Type',
        'content-length': 'Content-Length',
        etag: 'ETag' },
     _onPendingData: [Function: updateOutgoingData],
     req: [Circular],
     locals: {},
     statusMessage: 'OK',
     statusCode: 200 },
  route:
   Route {
     path: '/registerUser',
     stack: [ [Object] ],
     methods: { post: true } } }

问题是我的username==test和foo=bar去了哪里？如何访问req.data或类似内容？

我正在查看文档：{​​{3}}这没有任何意义，关于我在请求中传递的数据没有一个单词，我关心的是我的数据，这就是我的意思正在努力，这就是我想要推送到MongoDB的。

我错过了一些大事。救命？ ：）

Answer 1

如果您使用快递，那么如果您打印请求，简单请求将无法提供您想要的数据。

  

req.body   包含请求正文中提交的键值对数据。默认情况下，它是未定义的，并在您使用正文解析中间件（例如body-parser和multer）时填充。

这是文档中提到的并由Express Framework https://expressjs.com/en/api.html

推荐

所以，如果你想在快递中检查它做一些像这样的事情

var app = 

require('express')();
var bodyParser = require('body-parser');
var multer = require('multer'); // v1.0.5
var upload = multer(); // for parsing multipart/form-data

app.use(bodyParser.json()); // for parsing application/json
app.use(bodyParser.urlencoded({ extended: true })); // for parsing application/x-www-form-urlencoded

app.post('/registerUser', function (req, res) {
  console.log(req.body); //console.log(req)
  res.json(req.body); //res.send("hello world post")
});

您还可以使用快速框架或正文解析器检查您的请求。 在这里，我发布了一个简单的例子，在每个请求上打印帖子正文

var http =

 require("http");

http.createServer(function (request, response) {
     request.on('data', function(chunk) {
        var bodydata = chunk.toString('utf8');
        console.log(bodydata)
    });
   response.writeHead(200, {'Content-Type': 'text/plain'});
   response.end('hi welcome\n');
}).listen(8081);
console.log('Server running at http://127.0.0.1:8081/');

如果您使用bodysarser并表达

，这将是怎样的

这里是body，你使用body解析器并表达

这是我的帖子请求

这是我的输出转换缓冲区到字符串

这是我的简单节点请求，使用包含数据事件的快递

数据作为req

中的缓冲区

Answer 2

这基本上是Express的工作原理：

var express = require('express'),
    bodyparser = require('body-parser');

var app = express();

// Middleware
app.use(bodyparser.urlencoded({extended: false}));

app.get('/foo', function (req, res) {
  // GET /foo?msg=hello ---> {msg: 'hello'}
  console.log(req.query);
});

app.post('/bar', function (req, res) {
  // POST msg=hello ---> {msg: 'hello'}
  console.log(req.body);
});

app.listen(3000);

Answer 3

如果收到的请求是username，那么您可以通过GET访问该请求，而且这是快速开箱即用的。如果传入的请求是req.query，您需要使用this之类的内容，然后您可以访问POST来访问传入的信息。