mongoose-error-humanizer

Mongoose post hook handler to automatically convert validation and dup errors into human friendly strings

Important: This package cannot detect when mongoose custom error messages are used in your schema (https://mongoosejs.com/docs/validation.html#custom-error-messages). Do not use this package if you need your custom error messages to be thrown.

Example Error Messages

Case	Example
required field missing	name required
multiple, required fields missing	email required, name required
index (unique) violation	email must be unique
enum violation	country cannot be other
string min length violation	city must be at least 1 character(s) long
string max length violation	city cannot be more than 10 character(s) long
number min violation	age must be at least 1
number max violation	age cannot exceed 100
nested field violations	birthday.year must be at least 1900

Thrown errors are of type MongooseHumanError (an extension of the Error class).

Usage

const mongoose = require('mongoose')
const humanizeErrors = require('mongoose-error-humanizer')

const schema = new mongoose.Schema({
  name: { type: String, required: true, unique: true }
})

schema.post('save', humanizeErrors)
schema.post('update', humanizeErrors)

module.exports = mongoose.model('MyModel', schema)