无法使用fetch()从React Client到Nodejs服务器获取数据

时间:2018-09-02 16:34:39

标签: node.js reactjs express

这是我的客户:

 handleSubmit(event) {    event.preventDefault();    alert(`starting to stream ${this.state.value} at ${this.state.volume}`)    fetch('/emitter', {
     method: 'post',
     body: JSON.stringify({
     value: this.state.value,
     volume: this.state.volume
      }),
      headers: {"Content-Type": "application/json"}
    });
    alert(`${this.state.value} and ${this.state.volume} sent to server`)    };

这是我的服务器:

app.use(express.static(__dirname + '/build'));
app.all('*', function(req, res, next) {
  res.header('Access-Control-Allow-Origin', '*');
  res.header('Access-Control-Allow-Methods', 'PUT, GET, POST, DELETE, OPTIONS');
  res.header('Access-Control-Allow-Headers', 'Content-Type');
  next();
});

app.use(bodyParser.urlencoded({
  extended: true
}));

app.post('/emitter', function (req, res) {
  console.log(req.body)
});

我只是想将数据从输入表单发送到服务器。为什么在服务器中收到{}时我会得到一个空的req.body

1 个答案:

答案 0 :(得分:0)

编辑:

作为参考,这是答案: https://github.com/github/fetch/issues/323#issuecomment-277510957

app.use(bodyParser.json());

需要在之前或之后添加:

 app.use(bodyParser.urlencoded({
  extended: true
}));