Javascript 如何使用node.js中的请求以多部分formData发送对象

我正试图使用

POST

，但每当我尝试将

添加到
formData
中的
对象时，就会出现错误

var fs      = require('fs');
var request = require('request');
var file    = './test/assets/test.pdf';

var opts = {
  url: 'my_service',
  method: 'POST',
  auth: { user: 'username', password: 'password' },
  json: true,
  formData: {
    front: fs.createReadStream(file),
    to: {
      name: 'joe bob',
      address_1: '123 main st',
      ...
    }
  }
};

request(opts, function(err, resp, body) {
  console.log(err, body);
});

以下是错误：

/sandbox/project/node_modules/request/node_modules/combined-stream/node_modules/delayed-stream/lib/delayed_stream.js:33
  source.on('error', function() {});
         ^
TypeError: undefined is not a function
    at Function.DelayedStream.create (/Users/me/sandbox/project/node_modules/request/node_modules/combined-stream/node_modules/delayed-stream/lib/delayed_stream.js:33:10)
    at FormData.CombinedStream.append (/Users/me/sandbox/project/node_modules/request/node_modules/combined-stream/lib/combined_stream.js:43:37)
    at FormData.append (/Users/me/sandbox/lproject/node_modules/request/node_modules/form-data/lib/form_data.js:43:3)
    at appendFormValue (/Users/me/sandbox/project/node_modules/request/request.js:466:21)
    at Request.init (/Users/me/sandbox/project/node_modules/request/request.js:477:11)
    at new Request (/Users/me/sandbox/project/node_modules/request/request.js:264:8)
    at request (/Users/me/sandbox/project/node_modules/request/index.js:50:10)
    at Object.<anonymous> (/Users/me/sandbox/project/test.js:30:1)
    at Module._compile (module.js:460:26)
    at Object.Module._extensions..js (module.js:478:10)

/sandbox/project/node_modules/request/node_modules/combined stream/node_modules/delayed stream/lib/delayed_stream.js:33
on（'error'，function（）{}）；
^
TypeError:undefined不是函数
在Function.DelayedStream.create（/Users/me/sandbox/project/node_modules/request/node_modules/combined stream/node_modules/delayed stream/lib/delayed_stream.js:33:10）
在FormData.CombinedStream.append（/Users/me/sandbox/project/node_modules/request/node_modules/combined stream/lib/combined_stream.js:43:37）
在FormData.append（/Users/me/sandbox/lproject/node_modules/request/node_modules/form data/lib/form_data.js:43:3）
在appendFormValue（/Users/me/sandbox/project/node_modules/request/request.js:466:21）
at Request.init（/Users/me/sandbox/project/node_modules/Request/Request.js:477:11）
根据新请求（/Users/me/sandbox/project/node_modules/Request/Request.js:264:8）
应请求（/Users/me/sandbox/project/node_modules/request/index.js:50:10）
反对。（/Users/me/sandbox/project/test.js:30:1）
在模块处编译（Module.js:460:26）
在Object.Module.\u extensions..js（Module.js:478:10）

如果我删除
to
对象，一切正常

这是为什么？我做错了什么？
我在使用请求模块时遇到了类似的问题，在我将新行添加到“formData”之前，请求模块中的一切都正常工作。对我来说唯一有效的方法是创建一个字符串，该字符串将是JSON，它将在请求外部组成POST正文，并使用“body”而不是“formData”传递它

var postBody = "post body content";

request({
  method: "POST",
  uri: "my_service",
  auth: { user: 'username', password: 'password' },
  body: '{' + postBody + '}',
  ...
}).on("error", function(error){
  ...
};

formData
属性不处理作为值传入的对象。看见解决方案是使用
JSON.stringify

var fs      = require('fs');
var request = require('request');
var file    = './test/assets/test.pdf';

var toObj = {
  name: 'joe bob',
  address_1: '123 main st',
  ...
};
var opts = {
  url: 'my_service',
  method: 'POST',
  auth: { user: 'username', password: 'password' },
  json: true,
  formData: {
    front: fs.createReadStream(file),
    to: JSON.stringify(toObj)
  }
};

request(opts, function(err, resp, body) {
  console.log(err, body);
});

注意：它实际上是只支持字符串的表单数据包。请求使用表单数据。下面是他们提到使用“字符串、缓冲区和文件流”的例子