json - 通过 JSON 对象的 POST 请求

Question

我创建了一个服务器来为客户端提供发布请求。我正在使用 bodyserver，但出现一些错误

var bodyParser = require('body-parser')
     var express = require('express');
        var app = express();

app.use(bodyParser.json());

app.post('/v3/botstate/:channel/users/:userid', function (req, res) {
    console.log("hsijdaf");
    console.log(req.body);
    //console.log(req.body);        

 //  res.send('Hello POST');

})
var server = app.listen(8081, function () {

  var host = server.address().address
  var port = server.address().port

  console.log("Example app listening at http://%s:%s", host, port)

})

客户端如下所示，

var request = require('request');
request.post({
            url: "http://localhost:8081/v3/botstate/webchat/users/siddiq",
           headers: {
                "Content-Type": "application/json"
            },
            body: '{"jsonrpc":"2.0","id":"zdoLXrB5IkwQzwV2wBoj","method":"barrister-idl","params":[]}',
            json:true
}, function(error, response, body){
console.log(error);
console.log(JSON.stringify(response));
  console.log(body);
});

运行客户端时出现以下错误，

E:\TESTING>node exp.js
Example app listening at http://:::8081
SyntaxError: Unexpected token "
    at parse (E:\TESTING\node_modules\body-parser\lib\types\json.js:83:15)
    at E:\TESTING\node_modules\body-parser\lib\read.js:116:18
    at invokeCallback (E:\TESTING\node_modules\body-parser\node_modules\raw-body\index.js:262:16)
    at done (E:\TESTING\node_modules\body-parser\node_modules\raw-body\index.js:251:7)
    at IncomingMessage.onEnd (E:\TESTING\node_modules\body-parser\node_modules\raw-body\index.js:307:7)
    at emitNone (events.js:67:13)
    at IncomingMessage.emit (events.js:166:7)
    at endReadableNT (_stream_readable.js:921:12)
    at nextTickCallbackWith2Args (node.js:442:9)
    at process._tickCallback (node.js:356:17)

请帮我解决这个问题。

Answer 1

您已在客户端中设置了 Content-Type : application/json，但您的 POST 数据是 text/plain，而不是 json.这就是为什么 body-parser 无法解析它，因为它期望通过 header 得到 json。

从客户端的 body 中删除 ' ' 后尝试。

例如

var request = require('request');
request.post({
     url: "http://localhost:8081/v3/botstate/webchat/users/siddiq",
     headers: {
        "Content-Type": "application/json"
     },
     body: {
       "jsonrpc":"2.0",
       "id":"zdoLXrB5IkwQzwV2wBoj",
       "method":"barrister-idl",
       "params":[]
     },
     json:true
}, function(error, response, body){
   console.log(error);
   console.log(JSON.stringify(response));
   console.log(body);
});

希望对您有帮助。