How to catch the error when inserting a MongoDB document which violates an unique index?

Question

I\'m building a MEAN app.

This is my Username schema, the username should be unique.

var mongoose = require(\'mongoose\');
var Schema = mongoose.Sche         


        

Answer 1

You can also try out this nice package mongoose-unique-validator which makes error handling much easier, since you will get a Mongoose validation error when you attempt to violate a unique constraint, rather than an E11000 error from MongoDB:

var mongoose = require('mongoose');
var uniqueValidator = require('mongoose-unique-validator');

// Define your schema as normal.
var userSchema = mongoose.Schema({
    username: { type: String, required: true, unique: true }
});

// You can pass through a custom error message as part of the optional options argument:
userSchema.plugin(uniqueValidator, { message: '{PATH} already exists!' });