ExpressValidator什么也不做，總是回傳value:undefined,msg:'Invalidvalue'

我正在嘗試使用 Express Validator 來驗證服務器端的異步 POST 查詢。PERN 堆疊。Express Validator 似乎不驗證任何內容，因為無論輸入如何，它總是回傳相同的回應。這是我的代碼。我不知道為什么這不起作用。請幫忙。

const { validationResult, check } = require('express-validator');

const myValidationResult = validationResult.withDefaults({
    formatter: error => {
        return {
            myLocation: error.location,
        };
    },
});

app.post("/pathToContactTable", 
    [
        check('req.body.aName')
        .not().isEmpty()           // checks appear to do nothing.  violating them does nothing.
    ],
    async (req, res, next) => {
        console.log(req.body.aName);  // prints out exactly what it should
        
        var err = myValidationResult(req);

        console.log(!err.isEmpty());

        if (!err.isEmpty()) {
            console.log(err.mapped())
            return res.status(400).json({errors: err.array() });
        } else {

            try {

                const { aName, aLastName, aPhone, aEmail, job1, jobDesc1, job2, jobDesc2, job3, jobDesc3, edu, eduYear, certTitle } = req.body;
                const newApplicant = await pool.query(`INSERT INTO applicantContactTable 
                ( applicantName, applicantLastName, applicantPhone, applicantEmail, jobTitle1, jobDesc1, jobTitle2, jobDesc2, jobTitle3, jobDesc3, educationTitle, educationYear, certificationTitle) 
                VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13) RETURNING *`,
                    [aName, aLastName, aPhone, aEmail, job1, jobDesc1, job2, jobDesc2, job3, jobDesc3, edu, eduYear, certTitle]
                );
                
                res.json(newApplicant.rows[0]);  
            } catch (err) {
                console.error(err.message);
            }
        }
});

我預計驗證結果會有所不同，具體取決于通過前端表單輸入或不輸入值到 req.body.aName -->

const [aName, setAName] = useState("John");


const onSubmitForm = async (e) => {     
        e.preventDefault();     


//ERROR CHECKS with error messages on screen prior to POST sending
//name first
        var firstName = document.getElementById('firstNameInput').value;
        if (validateName(firstName)) {
            document.getElementById('firstName_error').classList.add('hidden');
        } else if (!validateName(firstName)){
            document.getElementById('firstName_error').classList.remove('hidden');
        }
try { const body = { aName, aLastName, aPhone, aEmail, job1, jobDesc1, job2, jobDesc2, job3, jobDesc3, edu, eduYear, certTitle }; const response = await fetch("http://localhost:5000/pathToContactTable", method: "POST", headers: { "Content-Type": "application/json" }, body: JSON.stringify(body) });

        getApplicants();

        // window.location = "/";  <-- This WAS inelegant and was replaced with a call to getApplicants();

    } catch (err) { 
        console.log('this line fires in catch block of client POST')
        console.error(err.message);
    }   
};

uj5u.com熱心網友回復：

您應該只將欄位名稱傳遞給check()：

check('aName')

它將針對不同的請求物件驗證該欄位（如手冊中所述）。

如果您只想將檢查限制為req.body.aName，請使用：

body('aName')

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