如何从中间件中调用{express，connect} .bodyParser（）？ [英] How do I call {express,connect}.bodyParser() from within middleware?

问题描述

我有一些自定义中间件。在我的某些处理程序中，我想使用 req.body ，但这仅在用户使用时有效

I have some custom middleware. In some of my handlers, I want to use req.body, but that only works if the user did

app.use(express.bodyParser());

我总是可以告诉用户必须先使用express.bodyParser（），但是我宁愿安全并在尚未加载的情况下实例化它。

I could always tell the user, "you must use express.bodyParser() first," but I prefer to be safe and instantiate it if it has not been loaded yet.

有什么方法可以调用 express.bodyParser（）还是 connect.bodyParser（）？

Is there any way to invoke express.bodyParser() or connect.bodyParser() inside middleware?

推荐答案

我不确定这是否会奏效，是否会一直奏效，但我相信这将是您完成所需工作的更近一步方式，无需依赖于连接/表达 （您未在问题中指定的内容）。

I'm not sure if this is will work and if it'll always work, but I believe it'll be the "closer" way of doing what you want, without depending on connect/express (thing that you haven't specified in your question).

// Beware that the main module of the node process _must_
// be able to resolve express with this! This will allow to not depend on express.
var express = require.main.require( "express" );

// If you can depend on express, use this instead!
//var express = require( "express" );

function yourMiddleware( req, res, next ) {
    var me = function( req, res ) {
        // do your things
        next();
    };

    if ( req.body === undefined ) {
        express.bodyParser()( req, res, me );
    } else {
        me( req, res );
    }
}

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