express post參數問題

#js #express

超級前端人 2022-03-27 22:22:05 ‧ 668 瀏覽

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app.post('/send', (req, res)=>{
    res.send('ok')
    console.log(req.body.data);
})

請問為什麼每次post的body都是undefined

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1 個回答

Han

iT邦研究生 1 級 ‧ 2022-03-27 22:30:04

最佳解答

可以參考官網說明
https://expressjs.com/en/4x/api.html#req.body

Contains key-value pairs of data submitted in the request body. By default, it is undefined, and is populated when you use body-parsing middleware such as express.json() or express.urlencoded().

預設就是 undefined 沒有錯哦，除非要特別設定 middleware 處理你需要用的參數

官網範例

let express = require('express')

let app = express()

app.use(express.json()) // for parsing application/json
app.use(express.urlencoded({ extended: true })) // for parsing application/x-www-form-urlencoded

app.post('/profile', function (req, res, next) {
  console.log(req.body)
  res.json(req.body)
})