node.js - 自定义响应消息，用于验证 Node js 中的所有必需参数

Question

我是 NodeJS 和 Express 的新手，我想验证 API 参数。现在我通过以下方式验证参数:

if(!req.body.parametername)
    return res.send({"message": "Please provide parametername"});

if(!req.body.parametername)
    return res.send({"message": "parametername can not be blank"});

但我希望得到的响应是这样的:

{
    "username": [
        "This field is required."
    ],
    "password": [
        "This field can not be blank."
    ]
}

如果参数无效或未提供，这就是我想要的响应。

Answer 1

您可能会找到express-validator成为您在这里所需要的。特别是本节:

req.assert('email', 'required').notEmpty();
req.assert('email', 'valid email required').isEmail();
req.assert('password', '6 to 20 characters required').len(6, 20);

var errors = req.validationErrors(); // Or req.asyncValidationErrors();
var mappedErrors = req.validationErrors(true); // Or req.asyncValidationErrors(true);

mappedErrors 将如下所示:

{
  email: {
    param: "email",
    msg: "valid email required",
    value: "<received input>"
  },
  password: {
    param: "password",
    msg: "6 to 20 characters required",
    value: "<received input>"
  }
}