Question

[  server.js  ]

const fs = require("fs");
const express = require("express");
const bodyParser = require("body-parser");
const mysql = require("mysql");
const app = express();
const port = process.env.PORT || 5000;

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

const data = fs.readFileSync("./database.json");
const conf = JSON.parse(data);

const connection = mysql.createConnection({
    host: conf.host,
    user: conf.user,
    password: conf.password,
    port: conf.port,
    database: conf.database
});

connection.connect();

app.get("/api/users", (req, res) => {
    connection.query(
        "select * from users where isDeleted = 0",
        (err, rows, fields) => {
            res.send(rows);
            // console.log(err);
            // console.log(rows);
        }
    );
});


app.post("/api/users", (req, res) => {
    let sql = "insert into users values (null,?,?,now(),now(),0)";
    let name = req.body.name;
    let dsc = req.body.dsc;
    let params = [name, dsc];
    console.log(params);
    connection.query(sql, params,
        (err, rows, fields) => {
            res.send(rows);
            // console.log(err);
            // console.log(rows);
        });
});

app.delete("/api/users/:id", (req, res) => {
    let sql = "update users set isDeleted = 1 where id = ?";
    let params =[req.params.id];
    connection.query(sql,params,
        (err, rows, fields)=>{
            res.send(rows);
            // console.log(err);
            // console.log(rows);
        });
});

app.listen(port, () => console.log(`Listening on port http://localhost:${port}`));

描述错误

我正在尝试将表单数据发送到我的API，但是由于某些原因req.body未定义。

要复制

重现行为的步骤：

创建一个新请求输入您的API端点URL 选择主体选项卡，然后选择表单数据选项卡输入您要发送的表单数据的键名，以便您的API可以识别它，然后输入值。单击发送，您应该获得状态码为200的响应。如果收到像我这样的错误，告诉我req.body未定义，那么您将遇到与我相同的问题。

Answer 1

您正在使用bodyparser.json()。从文档中，这将解析JSON中仅的请求。您最好使用bodyParser.urlencoded([options])。
我建议改为使用express.urlencoded。

阅读this进行澄清

Answer 2

您缺少路由器

[  server.js  ]

const fs = require("fs");
const express = require("express");
const bodyParser = require("body-parser");
const mysql = require("mysql");
const app = express();
const port = process.env.PORT || 5000;

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

const data = fs.readFileSync("./database.json");
const conf = JSON.parse(data);

const connection = mysql.createConnection({
    host: conf.host,
    user: conf.user,
    password: conf.password,
    port: conf.port,
    database: conf.database
});

connection.connect();

// u need a router
const router = express.Router();

router.get("/api/users", (req, res) => {
    connection.query(
        "select * from users where isDeleted = 0",
        (err, rows, fields) => {
            res.send(rows);
            // console.log(err);
            // console.log(rows);
        }
    );
});


router.post("/api/users", (req, res) => {
    let sql = "insert into users values (null,?,?,now(),now(),0)";
    let name = req.body.name;
    let dsc = req.body.dsc;
    let params = [name, dsc];
    console.log(params);
    connection.query(sql, params,
        (err, rows, fields) => {
            res.send(rows);
            // console.log(err);
            // console.log(rows);
        });
});

router.delete("/api/users/:id", (req, res) => {
    let sql = "update users set isDeleted = 1 where id = ?";
    let params =[req.params.id];
    connection.query(sql,params,
        (err, rows, fields)=>{
            res.send(rows);
            // console.log(err);
            // console.log(rows);
        });
});

app.use(router);

app.listen(port, () => console.log(`Listening on port http://localhost:${port}`));

req.body未定义...我该如何解决

2 个答案: