API 接收未定义数据

Question

我是 JS 新手并做出反应，但我试图将一个字符串传递给我的 API，然后 API 将对所述字符串进行分析并传回情绪分数。但是，当我传递数据时，在我的 API 控制台中，字符串出现在“正文”中，API 声明“描述”未定义，导致 API 抛出错误。

api.js

const express = require('express');
const app = express()

app.use(express.json());

app.post('/', function (req, res) {
    console.log('body is:', req.body);
    const {description} = req.body;
    console.log('Description is:', description);

    var Analyzer = require('natural').SentimentAnalyzer;
    var stemmer = require('natural').PorterStemmer;
    var analyzer = new Analyzer("English", stemmer, "afinn");
    const sentiment = analyzer.getSentiment(description.split(' '));

    console.log('Sentiment is:', sentiment);

    res.json(JSON.stringify({sentiment}))
})

app.listen(3000, () => {
    console.log('listening on port 3000');
});

diary.js 包含 post 函数和 api 调用

async function makePostRequest (diaryText) {

  let payload = { Description: diaryText };

  let res = await axios.post('http://localhost:3000/', payload);

  let data = res.data;
  console.log("This is the data returned in the post function:",data);
}

makePostRequest("testText").then(response => {
  console.log("Data returned from the function call:", response);
}).then(error => {
  console.error(error.response.data);
});

这是执行上述代码时控制台中的输出：

body is: { Description: 'testText' }
Description is: undefined
TypeError: Cannot read property 'split' of undefined
    at /Users/ddavies/Desktop/Desktop Storage/programming/MSc_App/api.js:14:54
    at Layer.handle [as handle_request] (/Users/ddavies/Desktop/Desktop Storage/programming/MSc_App/node_modules/express/lib/router/layer.js:95:5)
    at next (/Users/ddavies/Desktop/Desktop Storage/programming/MSc_App/node_modules/express/lib/router/route.js:137:13)
    at Route.dispatch (/Users/ddavies/Desktop/Desktop Storage/programming/MSc_App/node_modules/express/lib/router/route.js:112:3)
    at Layer.handle [as handle_request] (/Users/ddavies/Desktop/Desktop Storage/programming/MSc_App/node_modules/express/lib/router/layer.js:95:5)
    at /Users/ddavies/Desktop/Desktop Storage/programming/MSc_App/node_modules/express/lib/router/index.js:281:22
    at Function.process_params (/Users/ddavies/Desktop/Desktop Storage/programming/MSc_App/node_modules/express/lib/router/index.js:335:12)
    at next (/Users/ddavies/Desktop/Desktop Storage/programming/MSc_App/node_modules/express/lib/router/index.js:275:10)
    at /Users/ddavies/Desktop/Desktop Storage/programming/MSc_App/node_modules/body-parser/lib/read.js:130:5
    at invokeCallback (/Users/ddavies/Desktop/Desktop Storage/programming/MSc_App/node_modules/raw-body/index.js:224:16)

Answer 1

对象键敏感，Description =/= description

const {Description} = req.body;