blocks|key|531446|text|如果对正文解析的需求仅依赖于路由本身，那么最简单的做法是只在需要它的路由上使用bodyParser作为路由中间件函数，而不是在整个应用程序中使用它：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|531447|var+express=require('express');
var+app=express.createServer();
app.post('/body',+express.bodyParser(),+function(req,+res)+{
++++res.send(typeof(req.body),+{'Content-Type':+'text/plain'});
});
app.post('/nobody',+function(req,+res)+{
++++res.send(typeof(req.body),+{'Content-Type':+'text/plain'});
});
app.listen(2484);|code-block|syntax|javascript|531448|entityMap^0|13|A|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

If the need for body parsing depends only on the route itself, the simplest thing is to use <code>bodyParser</code> as a route middleware function on only the routes that need it rather than using it app-wide:

<pre><code>var express=require('express');
var app=express.createServer();
app.post('/body', express.bodyParser(), function(req, res) {
 res.send(typeof(req.body), {'Content-Type': 'text/plain'});
});
app.post('/nobody', function(req, res) {
 res.send(typeof(req.body), {'Content-Type': 'text/plain'});
});
app.listen(2484);
</code></pre>

blocks|key|314454|text|在app.configure之前抛出这个|type|unstyled|depth|inlineStyleRanges|entityRanges|data|314455|delete+express.bodyParser.parse['multipart/form-data'];|code-block|syntax|javascript|314456|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

throw this is before app.configure

<pre><code>delete express.bodyParser.parse['multipart/form-data'];
</code></pre>

blocks|key|314491|text|在Express3中，您可以将参数作为{defer:+true}传递给bodyParser+--实际上，它会延迟多部分处理，并将强大的表单对象公开为req.form。这意味着你的代码可以是：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|314492|...
app.use(express.bodyParser({defer:+true}));

...
//+your+upload+handling+request+
app.post('/upload',+function(req,+res))+{
++++var+incomingForm+=+req.form++//+it+is+Formidable+form+object

++++incomingForm.on('error',+function(err){

++++++++++console.log(error);++//handle+the+error

++++})

++++incomingForm.on('fileBegin',+function(name,+file){

+++++++++//+do+your+things+here+when+upload+starts
++++})


++++incomingForm.on('end',+function(){

+++++++++//+do+stuff+after+file+upload
++++});

++++//+Main+entry+for+parsing+the+files
++++//+needed+to+start+Formidables+activity
++++incomingForm.parse(req,+function(err,+fields,+files){


++++})
}|code-block|syntax|javascript|314493|有关强大事件处理的更多详细信息，请参阅https://github.com/felixge/node-formidable|314494|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/felixge/node-formidable^0|J|D|Z|A|0|0|J|16|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|10|8|@]|D|@$9|11|A|12|1|13]]|E|$]]|$1|M|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

Within Express 3, you can pass parameter to the <code>bodyParser</code> as <code>{defer: true}</code> - which in term defers multipart processing and exposes the Formidable form object as req.form. Meaning your code can be:

<pre><code>...
app.use(express.bodyParser({defer: true}));

...
// your upload handling request 
app.post('/upload', function(req, res)) {
 var incomingForm = req.form // it is Formidable form object

 incomingForm.on('error', function(err){

 console.log(error); //handle the error

 })

 incomingForm.on('fileBegin', function(name, file){

 // do your things here when upload starts
 })


 incomingForm.on('end', function(){

 // do stuff after file upload
 });

 // Main entry for parsing the files
 // needed to start Formidables activity
 incomingForm.parse(req, function(err, fields, files){


 })
}
</code></pre>

For more detailed formidable event handling refer to <a href="https://github.com/felixge/node-formidable" rel="noreferrer">https://github.com/felixge/node-formidable</a>

blocks|key|531528|text|我在3.1.1中遇到过类似的问题，并找到了(不太理想的)解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|531529|要禁用多部分/表单数据的bodyParser：|531530|var+bodyParser+=+express.bodyParser();
app.use(function(req,res,next){
++++if(req.get('content-type').indexOf('multipart/form-data')+===+0)return+next();
++++bodyParser(req,res,next);
});|code-block|syntax|javascript|531531|并且用于解析内容：|531532|app.all('/:token?/:collection',function(req,res,next){
++++if(req.get('content-type').indexOf('multipart/form-data')+!==+0)return+next();
++++if(req.method+!=+'POST'+&&+req.method+!=+'PUT')return+next();
++++//...use+your+custom+code+here
});|531533|例如，我使用node-multiparty，其中的自定义代码应如下所示：|531534|++++var+form+=+new+multiparty.Form();

++++form.on('file',function(name,file){
+++++++//...per+file+event+handling
++++});+++++

++++form.parse(req,+function(err,+fields,+files)+{
+++++++//...next();
++++});|531535|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

I've faced similar problems in 3.1.1 and found (not so pretty IMO) solution:

to disable bodyParser for multipart/form-data:

<pre><code>var bodyParser = express.bodyParser();
app.use(function(req,res,next){
 if(req.get('content-type').indexOf('multipart/form-data') === 0)return next();
 bodyParser(req,res,next);
});
</code></pre>

and for parsing the content:

<pre><code>app.all('/:token?/:collection',function(req,res,next){
 if(req.get('content-type').indexOf('multipart/form-data') !== 0)return next();
 if(req.method != 'POST' &amp;&amp; req.method != 'PUT')return next();
 //...use your custom code here
});
</code></pre>

for example I'm using node-multiparty where the custom code should look like this:

<pre><code> var form = new multiparty.Form();

 form.on('file',function(name,file){
 //...per file event handling
 }); 

 form.parse(req, function(err, fields, files) {
 //...next();
 });
</code></pre>

blocks|key|314592|text|使用express+v4和body-parser+v1.17及更高版本，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|314593|您可以在bodyParser.json的type中传递函数。|offset|length|style|CODE|314594|body-parser将只解析该函数返回真值的那些输入。|314595|app.use(bodyParser.json({
++++type:+function(req)+{
++++++++return+req.get('content-type').indexOf('multipart/form-data')+!==+0;
++++},
}));|code-block|syntax|javascript|314596|在上面的代码中，|314597|如果content-type为multipart/form-data，该函数将返回一个False值。|314598|因此，当content-type为multipart/form-data时，它不会解析数据。|314599|entityMap^0|0|K|4|0|0|0|0|2|C|F|J|0|4|C|H|J|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@$D|Y|E|Z|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|10|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|11|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|12|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|13|8|@$D|14|E|15|F|G]|$D|16|E|17|F|G]]|9|@]|A|$]]|$1|S|3|T|5|6|7|18|8|@$D|19|E|1A|F|G]|$D|1B|E|1C|F|G]]|9|@]|A|$]]|$1|U|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]]|V|$]]

With express v4, and body-parser v1.17 and above, 
You can pass a function in the <code>type</code> of bodyParser.json. 
body-parser will parse only those inputs where this function returns a truthy value. 

<pre><code>app.use(bodyParser.json({
 type: function(req) {
 return req.get('content-type').indexOf('multipart/form-data') !== 0;
 },
}));
</code></pre>

In the above code, 
the function returns a falsy value if the <code>content-type</code> is <code>multipart/form-data</code>. 
So, it does not parse the data when the <code>content-type</code> is <code>multipart/form-data</code>.

This seems like it should be a fairly simple question, but I'm having a really hard time figuring out how to approach it.

I'm using Node.js + Express to build a web application, and I find the connect BodyParser that express exposes to be very useful in most cases. However, I would like to have more granular access to multipart form-data POSTS as they come - I need to pipe the input stream to another server, and want to avoid downloading the whole file first.

Because I'm using the Express BodyParser, however, all file uploads are parsed automatically and uploaded and available using "request.files" before they ever get to any of my functions.

Is there a way for me to disable the BodyParser for multipart formdata posts without disabling it for everything else?

How to disable Express BodyParser for file uploads (Node.js)

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这似乎应该是一个相当简单的问题，但我真的很难弄清楚如何解决这个问题。我正在使用Node.js + Express构建一个web应用程序，我发现express公开的连接BodyParser在大多数情况下都非常有用。但是，我希望更细粒度地访问多部分表单--当它们到来时--我需要将输入流通过管道传输到另一台服务器，并且希望避...

问如何禁用文件上载的快速BodyParser (Node.js)
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