Improve mongoose validation error handling

In the catch block, you can check if the error is a mongoose validation error, and dynamically create an error object like this:

router.post("/user", async (req, res) => {  try {    var user = new User(req.body);    await user.save();    res.status(200).send(user);  } catch (error) {    if (error.name === "ValidationError") {      let errors = {};      Object.keys(error.errors).forEach((key) => {        errors[key] = error.errors[key].message;      });      return res.status(400).send(errors);    }    res.status(500).send("Something went wrong");  }});

When we send a request body like this:

{   "email": "test",   "password": "abc"}

Response will be:

{    "email": "Please enter a valid E-mail!",    "password": "Length of the password should be between 6-1000"}

you can use validator like this instead of throwing an error :

password:{    type:String,    required:[true, "Password is a required field"],validate: {  validator: validator.isLength(value,{min:6,max:1000}),  message: "Length of the password should be between 6-1000"}    }

you can send

res.status(400).send(error.message);

instead of :

res.status(400).send(error);

and you should make some changes in Schema also.

validate(value){            if (!validator.isEmail(value)) {                throw new Error("Please enter a valid E-mail!");            }        }

with

validate: [validator.isEmail, "Please enter a valid E-mail!" ]

and for password:

minlength: 6,maxlength:1000,validate:{validator: function(el){return el.toLowerCase() !== "password"}message: 'The password should not contain the keyword "password"!'}