how to write custom error message in Postman using nodejs - node.js

Question

In my case, if I unselect any field in postman, I got an error in the terminal but I want to print that error message or custom error in the postman response. how to do that?
POST method
router.post("/admin/add_profile", upload.single("image"), async (req, res) => {
try {
const send = new SomeModel({
first_name: req.body.first_name,
last_name: req.body.last_name,
phone: req.body.phone,
email: req.body.email,
image: req.file.filename,
});
send.save();
const result = await s3Uploadv2(req.files);
res.json({ status: "Everything worked as expected", result });
} catch (err) {
res.status(404).send(err.message);
}
});
schema.js
const mongoose = require("mongoose");
const Schema = mongoose.Schema;
const SomeModelSchema = new Schema({
first_name: {
type: String,
required: true,
},
last_name: {
type: String,
required: ["last name is required"],
},
phone: {
type: Number,
required: ["Phone number is required"],
unique: true,
validate: {
validator: (val) => {
return val.toString().length >= 10 && val.toString().length <= 12;
},
},
},
email: {
type: String,
trim: true,
lowercase: true,
unique: true,
required: ["email address is required"],
validate: (email) => {
return /^\w+([\.-]?\w+)*#\w+([\.-]?\w+)*(\.\w{2,3})+$/;
},
match: [
/^\w+([\.-]?\w+)*#\w+([\.-]?\w+)*(\.\w{2,3})+$/,
"Please fill a valid email address",
],
},
image: {
data: Buffer,
contentType: String
}
});
module.exports = mongoose.model("SomeModel", SomeModelSchema);
here I unselected the first_name field but I got an error in the terminal I want to print that error or a custom error in the postman response.
error message in terminal

Answer 1

You should await the save() call, which returns a Promise.
You should then be able to handle the error in the catch block:
router.post('/admin/add_profile', upload.single('image'), async (req, res) => {
try {
const send = new SomeModel({
first_name: req.body.first_name,
last_name: req.body.last_name,
phone: req.body.phone,
email: req.body.email,
image: req.file.filename,
});
await send.save();
const result = await s3Uploadv2(req.files);
res.json({ status: 'Everything worked as expected', result });
} catch (error) {
if (error.name === "ValidationError") {
let errors = [];
for (const err in error.errors) {
errors.push(err.message)
}
return res.status(400).send(errors);
}
res.status(500).send('Server error');
}
});