Node.js 快速验证器：如何检查查询

使用

express validator

我们如何检查请求的查询

文档中有一个检查正文的示例：

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

app.post('/user', [
  // username must be an email
  check('username').isEmail(),
  // password must be at least 5 chars long
  check('password').isLength({ min: 5 })
], (req, res) => {
  // Finds the validation errors in this request and wraps them in an object with handy functions
  const errors = validationResult(req);
  if (!errors.isEmpty()) {
    return res.status(422).json({ errors: errors.array() });
  }

  User.create({
    username: req.body.username,
    password: req.body.password
  }).then(user => res.json(user));
});

如何将其设置为仅检查

GET

方法的查询

GET/user？username=name

---

我只想在这里的查询中检查

用户名
。
您可以通过以下方式实现：

app.post('/user', [
  check.query('username')
], (req, res) => {
 //your code
});

要检查查询参数中的变量，即req.query，请使用query（[fields，message]）。
与检查（[fields，message]）相同，但仅检查请求查询

例子：
安装express validator

npm install --save express-validator

导入查询

const { query } = require('express-validator/check');

router.post('/add-product', 
                isAuth, 
                [
                    query('title')
                        .isString().withMessage('Only letters and digits allowed in title.')
                        .trim()
                        .isLength({min: 3}).withMessage('Title too short. Enter a longer title!'),
                    query('price', 'Enter a valid price.')
                        .isFloat(),
                    query('description')
                        .trim()
                        .isLength({min: 30, max: 600}).withMessage('Description must be of minimum 30 and maximum 600 characters!'),
                ],
                adminController.postAddProduct);

使用查询

const { query } = require('express-validator/check');

router.post('/add-product', 
                isAuth, 
                [
                    query('title')
                        .isString().withMessage('Only letters and digits allowed in title.')
                        .trim()
                        .isLength({min: 3}).withMessage('Title too short. Enter a longer title!'),
                    query('price', 'Enter a valid price.')
                        .isFloat(),
                    query('description')
                        .trim()
                        .isLength({min: 30, max: 600}).withMessage('Description must be of minimum 30 and maximum 600 characters!'),
                ],
                adminController.postAddProduct);

请参阅此处的官方文档：
验证程序是-

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

const fetchStatementValidator = [
    check('startdate').not().isEmpty().withMessage("Start date cannot be empty"),
    check('enddate').not().isEmpty().withMessage("End Date cannot be empty"),
]

module.exports.fetchStatementValidator = fetchStatementValidator;

Api是-

router.get("/fetchStatement", auth.adminAuth, validator.fetchStatementValidator, utility.statements.fetchStatement); //fetch statement

API定义-

/* Fetch transections */
module.exports.fetchStatement = async (req, res, next) => {
    const errors = validationResult(req);
    if (!errors.isEmpty()) {
        return res.status(422).json({
            success: false,
            errors: errors.array()
        });
    }
};

经邮递员发出的空气污染指数-

http://localhost:5000/loans/fetchCompletedLoans?page=1&startdate=2019-09-08&enddate=

回应-

{
    "success": false,
    "errors": [
        {
            "value": "",
            "msg": "End Date cannot be empty",
            "param": "enddate",
            "location": "query"
        }
    ]
}