NodeJS,Mongoose: Required field validation - node.js

Question

I can add a new item to the database if I get a correctly formatted JSON file in the body where every required field contains something. If its false, right now I just return a JSON file like this:
{
"succes": false
}
But I also want to return an error message. I have already implemented the error string in the Model but I dont know how can I pull this out, if the catch block catches the error...
My add new item method:
exports.addBootcamp = async (req, res, next) => {
try {
const bootcamp = await Bootcamp.create(req.body);
if (!bootcamp) {
return res.status(404).json({ succes: false });
}
res.status(201).json({
succes: true,
data: bootcamp
});
} catch (err) {
return res.status(404).json({ succes: false });
}
};
The beggining part of my Model:
const BootcampShema = new mongoose.Schema({
name: {
type: String,
required: [true, 'Please add a name'], //first error message
unique: true,
trim: true,
maxlength: [50, 'Name cannot be more than 50 characters']
},
slug: String,
description: {
type: String,
required: [true, 'Please add a description'], //second error message
maxlength: [500, 'Description cannot be more than 500 characters']
},
//...etc
Of course these are in seperate js files but I can export them.

Answer 1

In this case we'll get a ValidationError from database which will be encapsulated in error object.
Modify your catch statement to below:
try {
// as it is
}
catch (err) {
return res.status(404).json({
succes: false,
message: err.message
});
}
Mongo db return the error object as below. From this structure you can extract whatever info you want and return that to user.
{
"errors": {
"name": {
"message": "Please add a name",
"name": "ValidatorError",
"properties": {
"message": "Please add a name",
"type": "required",
"path": "name"
},
"kind": "required",
"path": "name"
}
},
"_message": "Name validation failed",
"message": "Name validation failed: camera_name: Please add a name",
"name": "ValidationError"
}
Here Please add a name is the same text we entered in our model.