无效的JSON GET Request Express.js [英] Invalid JSON GET Request Express.js

问题描述

在编写API时，我遇到了一个非常棘手的错误：当我尝试使用Content-Type头文件 res.send（INSERT JSON） code> application / json （大多数AJAX的默认值），我得到一个无效的json 错误。当我将内容类型设置为其他任何东西（例如 text / plain ）时，我得到正确的响应，但为了使用一些前端框架，我需要支持 application / json 。以下是实际的错误信息：

While writing an API, I have come across a very thorny error: when I try to do a res.send(INSERT JSON) with a Content-Type header application/json (a default for most AJAX), I get an invalid json error. When I set the content-type to anything else (eg. text/plain), I get the correct response, but in order to use some front-end frameworks, I need to support application/json. Here is the actual error message:

Error: invalid json
    at Object.exports.error (/Users/Brad/node_modules/express/node_modules/connect/lib/utils.js:44:13)
    at IncomingMessage.module.exports (/Users/Brad/node_modules/express/node_modules/connect/lib/middleware/json.js:68:73)
    at IncomingMessage.EventEmitter.emit (events.js:85:17)
    at IncomingMessage._emitEnd (http.js:366:10)
    at HTTPParser.parserOnMessageComplete [as onMessageComplete] (http.js:149:23)
    at Socket.socket.ondata (http.js:1680:22)
    at TCP.onread (net.js:410:27)

我的服务器代码如下：

app.configure(function () {
  app.use(express.bodyParser());
  app.use(express.cookieParser('SALT'));
  app.use(express.static(__dirname + '/static/'));
  app.use(express.session());
});

app.get('/users', function(req, res) {
  res.send({'test': 'test'});
});

以下是我的邮递员设置的图片 - 我正在使用Postman Chrome扩展程序来测试我的API ：

Here is an picture of my Postman setup--I am using the Postman Chrome extension to test my API:

推荐答案

我相信问题是你想在服务器响应中使用Content-Type头;不在您的请求内容类型标题。

I believe the problem is that you want to be using Content-Type header in your servers response; not in your request Content-Type header.

当您在请求中使用Content-Type标头时，Express将读取Content-Type，并尝试将提供的信息解释为Content-Type，在这种情况下，作为JSON。因为这是一个GET请求，因此没有任何机构，Express正试图将一个空字符串解释为JSON，这是给你错误。

When you use the Content-Type header in your request, Express will read the Content-Type and attempt to interpret the provided information as that Content-Type, in this case, as JSON. Because this is a GET request and thus has no body, Express is trying to interpret an empty string as JSON, which is giving you the error.

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