Python Flask-request.json返回None类型而不是json字典 [英] Python Flask - request.json returns None Type instead of json dictionary

问题描述

我正在编写一个非常简单的演示Web应用程序，并且似乎无法使用 ajax js 传递给 python >.

I'm writing a very simple demo webapp, and I can't seem to pass a json object from js to python using ajax.

我尝试了很多类似问题的建议，例如使用.get_json()而不是.json，不使用javascript在不使用JSON.stringify的情况下传递对象等.

I've tried a number of suggestions from people on so with similar problems, such as using .get_json() instead of .json, passing the object without using JSON.stringify in the javascript, etc.

知道我在这里遗失了什么吗?

Any idea what piece I'm missing here?

JavaScript

var run_method = function(){

  var data1 = {"word":"hello"}
  console.log("Before " + data1);
  $.ajax({
      url : "/examplemethod",
      type : "POST",
      data : data1//JSON.stringify(data1)
  })
  .done(function(data){
      var data = JSON.parse(data);
      console.log(data);

  });
}

Python

@app.route("/examplemethod", methods=['POST', 'GET'])
def example_method():
    global data
    if request.method == 'POST':
        print request
        data = request.json
        print "data", data
    return "after "+ data["word"]

我尝试过的每个变化都会给出 500错误，并且

Every variation I have tried of this gives a 500 Error, and

TypeError:"NoneType"对象没有属性" getitem "

很明显，这是因为数据应该是dictionary/json，而不是None.但是，如何获取它作为字典返回呢?

Obviously, that is because data is supposed to be an dictionary/json, not None. But how to I get it to return as a dictionary?

推荐答案

因为您没有向flask应用发送JSON(请参见此).您当前的代码会产生一个标准的urlencoded表单发布.反过来导致在request.form

Because you are not sending JSON, to the flask app (see this and this). Your current code results in a standard urlencoded form post. Which in turn results in an entry being populated in request.form

 request.form.get('word')

根据上述问题与解答中的指南切换到json帖子，以通过request.json访问数据.

Switch to a json post as per the guidelines in the above Q&As to access the data through request.json.

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