req.query 获取查询字符串参数

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post {{http}}/api/login?username=admin&password=000000 
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console.log(req.query) // { username: 'admin', password: '000000' }

req.body 获取json数据参数

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post {{http}}/api/login
Content-Type: application/json

{
    "username":"admin",
    "password":"000000"
}
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app.use(express.json())
console.log(req.body) // { username: 'admin', password: '000000' }

req.body 获取 application/x-www-form-urlencoded 数据参数

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GET  http://localhost:9090/user
Content-Type: application/x-www-form-urlencoded

username=admin&password=000000
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app.use(express.urlencoded({extended:false}))
console.log(req.body) // [Object: null prototype] { username: 'admin', password: '000000' }