Get Mongoose validation error message in React - node.js

Question

I am trying to validate user creation/editing etc with Mongoose and get back the message on my front end, but all I get is
POST http://192.168.0.11:3000/users/create 400 (Bad Request)
CreateUser.jsx:48 Error: Request failed with status code 400
at e.exports (createError.js:16)
at e.exports (settle.js:17)
at XMLHttpRequest.d.onreadystatechange (xhr.js:61)
My User schema:
const User = new mongoose.Schema({
Name: {
type: String,
required: "Username is required for a user!",
minlength: 4,
maxlength: 16,
},
Password: {
type: String,
required: "Password is required for a user!",
minlength: 4,
maxlength: 20,
},
Role: {
type: String,
required: "User must have a role!",
enum: ["Operator", "Admin"],
}
});
In Node:
router.post("/create", async (req, res) => {
try {
const user = new User({
Name: req.body.Name,
Password: req.body.Password,
Robots: req.body.Robots,
Role: req.body.Role,
});
await user.save();
res.send("success");
} catch (e) {
console.log(e);
res.status(400).json("Error" + e);
}
});
And in React:
try {
const userCreated = await axios.post(`${ENDPOINT}/users/create`, user);
console.log(userCreated);
} catch (e) {
console.log(e);
}
If it is successful I get back the "success" message, but otherwise I keep getting the POST 400 bad request message.
If I console.log it within node it does throw validation failed errors, but I can't get the error back on the front end.

Answer 1

I tried almost the same example with one of my express boilerplate repo here and I was able to return Mongo validation error like this.
part of an User model
first_name: {
type: String,
trim: true,
minlength: 4,
}
controller
try {
const user = await new User(req.body);
const newUser = await user.save();
res.status(201).json({ status: true, newUser });
} catch (error) {
console.log(error);
res.status(400).json(error);
}
Error response I got with 400 Bad Request, so you can check if name == 'ValidationError' in catch of your react app and can also use errors to display with the field.
{
"errors": {
"first_name": {
"message": "Path `first_name` (`a`) is shorter than the minimum allowed length (4).",
"name": "ValidatorError",
"properties": {
"message": "Path `first_name` (`a`) is shorter than the minimum allowed length (4).",
"type": "minlength",
"minlength": 4,
"path": "first_name",
"value": "a"
},
"kind": "minlength",
"path": "first_name",
"value": "a"
}
},
"_message": "User validation failed",
"message": "User validation failed: first_name: Path `first_name` (`a`) is shorter than the minimum allowed length (4).",
"name": "ValidationError"
}