来自 nodejs 中的 post 请求的未定义正文
[英]Undefined body from post request in nodejs
问题描述
I created the API in node js and in the POST method getting the body as undefined.
我在节点 js 和 POST 方法中创建了 API，将主体设为未定义。 How can I get the value that is passed using the fetch?如何获取使用 fetch 传递的值？
code for NodeJs------------------------------------------- NodeJs的代码-------------------------------------------
const express=require('express');
const app=express()
const port=3000
const fs=require('fs');
app.get('/',(req,res)=>{
res.send('hello world!');
});
app.get('/movies',(req,res)=>{
fs.readFile(__dirname+'/movies.json','utf-8',(err,data)=>{
res.send(data);
});
});
app.post('/movies',(req,res)=>{
console.log(req.body);
});
app.listen(port,()=>{
console.log(`app listening at http://localhost:${port}`)
});
code for HTML------------------------- HTML代码------------------------
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<form onsubmit="submitted(event)">
<input id="field" type="text" required="true">
<button type="submit">save</button>
</form>
</body>
<script>
function submitted(e){
e.preventDefault();
const value=document.getElementById('field').value;
await fetch('http://localhost:3000/movies',{
method:'POST',
body:{value},
mode:'no-cors',
headers:{
"Content-Type" : "application/json",
'Access-Control-Allow-Origin':'*'
}
});
}
</script>
</html>
2 个解决方案
解决方案1
0 2021-10-19 08:22:18
You need to use a middleware to parse the body correctly.您需要使用中间件来正确解析正文。 It looks like you're sending JSON, so you'll need the bodyParser middleware provided by express.看起来您正在发送 JSON，因此您需要express提供的bodyParser中间件。
解决方案2
0 2021-10-19 08:22:22
Well you have got 2 problems:那么你有两个问题：
1 Problem: 1 问题：
You need to stringify your body like你需要把你的身体像
body:JSON.stringify({value})
2 Problem: 2 问题：
In express you need to parse your body.在 express 中，你需要解析你的身体。 For that express provides .json()对于那个快递提供.json()
const express=require('express');
const app=express()
const port=3000
const fs=require('fs');
app.use(express.json())
声明:本站的技术帖子网页，遵循CC BY-SA 4.0协议，如果您需要转载，请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.