使用 Node.js 和 Express POST 时如何访问请求正文? [英] How to access the request body when POSTing using Node.js and Express?

问题描述

我有以下 Node.js 代码:

I have the following Node.js code:

var express = require('express');
var app = express.createServer(express.logger());
app.use(express.bodyParser());

app.post('/', function(request, response) {
    response.write(request.body.user);
    response.end();
});

现在，如果我发布如下内容:

Now if I POST something like:

curl -d user=Someone -H Accept:application/json --url http://localhost:5000

我按预期得到了Someone.现在，如果我想获得完整的请求正文怎么办?我尝试做 response.write(request.body) 但 Node.js 抛出一个异常说第一个参数必须是一个字符串或缓冲区"然后进入一个无限循环" 一个例外是在发送后无法设置标题.";即使我做了 var reqBody = request.body; 然后写 response.write(reqBody) 也是如此.

I get Someone as expected. Now, what if I want to get the full request body? I tried doing response.write(request.body) but Node.js throws an exception saying "first argument must be a string or Buffer" then goes to an "infinite loop" with an exception that says "Can't set headers after they are sent."; this also true even if I did var reqBody = request.body; and then writing response.write(reqBody).

这里有什么问题?

另外，我可以不使用 express.bodyParser() 直接获取原始请求吗?

Also, can I just get the raw request without using express.bodyParser()?

推荐答案

Express 4.0 及以上:

$ npm install --save body-parser

然后在您的节点应用程序中:

And then in your node app:

const bodyParser = require('body-parser');
app.use(bodyParser);

<小时>

Express 3.0 及以下:

尝试在您的 cURL 调用中传递这个:

---

Express 3.0 and below:

Try passing this in your cURL call:

--header "Content-Type: application/json"

并确保您的数据采用 JSON 格式:

and making sure your data is in JSON format:

{"user":"someone"}

此外，您可以在 node.js 代码中使用 console.dir 来查看对象内的数据，如下例所示:

Also, you can use console.dir in your node.js code to see the data inside the object as in the following example:

var express = require('express');
var app = express.createServer();

app.use(express.bodyParser());

app.post('/', function(req, res){
    console.dir(req.body);
    res.send("test");
}); 

app.listen(3000);

这个其他问题也可能有帮助:如何在 express node.js POST 请求中接收 JSON?

This other question might also help: How to receive JSON in express node.js POST request?

如果您不想使用 bodyParser，请查看另一个问题:https://stackoverflow.com/a/9920700/446681

If you don't want to use the bodyParser check out this other question: https://stackoverflow.com/a/9920700/446681

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