Node.js Express express.json 和 express.urlencoded 与表单提交
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Node.js Express express.json and express.urlencoded with form submit
提问by huggie
Express (or Connect's) bodyParser middleware is marked deprecated and users are advised to use instead:
Express（或 Connect 的） bodyParser 中间件被标记为已弃用，建议用户改用：
app.use(connect.urlencoded())
app.use(connect.json())
However, when I run the an example from Node.js in Action, I use curl to fill out the form as suggested by the book:
但是，当我运行Node.js in Action 中的一个示例时，我使用 curl 来按照本书的建议填写表单：
curl -F entry[title]='Ho ho ho' -F entry[body]='santa loves you' http://abc:[email protected]:3000/api/entry
It doesn't work. req.bodyis not defined. Am I missing something? It works fine with bodyParser.
它不起作用。req.body没有定义。我错过了什么吗？它适用于 bodyParser。
EDIT: SOLUTION as of Express 4
编辑：自 Express 4 起的解决方案
Parse json this way:
以这种方式解析 json：
var bodyParser = require('body-parser');
...
app.use(bodyParser.json());
Parse urlencoded body this way:
以这种方式解析 urlencoded 正文：
app.use(bodyParser.urlencoded({extended: true}));
Then there is no deprecation warning. The extended: true (default) uses the qs module and false uses the querystring module to parse the body.
然后没有弃用警告。extended: true（默认）使用 qs 模块，false 使用 querystring 模块来解析正文。
Don't use app.use(bodyParser()), that usage is now deprecated.
不要使用app.use(bodyParser())，该用法现已弃用。
回答by Paul Mougel
bodyParseris in fact the composition of three middlewares (see documentationand relevant source code): json, urlencodedand multipart:
bodyParser实际上是三个中间件的组合（参见文档和相关源代码）：json，urlencoded和multipart：
jsonparsesapplication/jsonrequest bodiesurlencodedparsesx-ww-form-urlencodedrequest bodies- and
multipartparsesmultipart/form-datarequest bodies, which is what you're interested in.
json解析application/json请求体urlencoded解析x-ww-form-urlencoded请求体- 并
multipart解析multipart/form-data您感兴趣的请求正文。
If you only specify jsonand urlencodedmiddlewares, the form data won't be parsed by any middleware, thus req.bodywon't be defined. You then need to add a middleware that is able to parse form data such as formidable, busboy or multiparty (as stated in connect's documentation).
如果只指定json和urlencoded中间件，则表单数据不会被任何中间件解析，因此req.body不会被定义。然后，您需要添加一个能够解析表单数据的中间件，例如 formidable、busboy 或 multiparty（如connect的文档中所述）。
Here is an example, using multiparty:
这是一个示例，使用multiparty：
var multipart = require('connect-multiparty');
var multipartMiddleware = multipart();
app.use('/url/that/accepts/form-data', multipartMiddleware);
app.post('/url/that/accepts/form-data', function(req, resp) {
console.log(req.body, req.files);
});
Don't forget that by using such middlewares you allow anyone to upload files to your server: it then your responsibility to handle (and delete) those files.
不要忘记，通过使用此类中间件，您允许任何人将文件上传到您的服务器：然后您有责任处理（和删除）这些文件。
