Validators for Mongoose schemas utilising validator.js.
Mongoose Validator simply returns Mongoose style validation objects that utilises validator.js for the data validation.
Version 1.0.x has been refactored to support a simpler interface and also validator.js 3.0.x
NOTE: If you were using 0.2.x with your projects please be aware that upgrading to 1.0.x will break them. As of validator.js 3.0.x - many of the available validators have been changed. For example, 'regex' validator no longer exists and has been replaced with 'matches'.
$ npm i mongoose-validator -SIf you need to install the 0.2.2 release, use the following command:
$ npm i [email protected] -SMore details on 0.2.2 can be found here
var mongoose = require('mongoose');
var validate = require('mongoose-validator');
var nameValidator = [
validate({
validator: 'isLength',
arguments: [3, 50],
message: 'Name should be between {ARGS[0]} and {ARGS[1]} characters',
}),
validate({
validator: 'isAlphanumeric',
passIfEmpty: true,
message: 'Name should contain alpha-numeric characters only',
}),
];
var Schema = new mongoose.Schema({
name: { type: String, required: true, validate: nameValidator },
});Error objects are returned as normal via Mongoose.
Name of the validator or a custom function you wish to use, this can be any one of the built-in validator.js validators, or a custom validator.
Arguments to be passed to the validator. These can either be an array of arguments (for validators that can accept more than one i.e. isLength), or a single argument as any type.
Some of the validator.js validators require a value to check against (isEmail, isUrl etc). There may be instances where you don't have a value to check i.e. a path that is not required and as such these few validators return an false value causing validation to fail. This can now be bypassed by setting the passIfEmpty option.
Set the error message to be used should the validator fail. If no error message is set then mongoose-validator will attempt to use one of the built-in default messages, if it can't then a simple message of 'Error' will be returned. Enhanced message templating is supported by giving the ability to use the validator arguments. You can use these like {ARGS[argument index position]}. Note: Use {ARGS[0]} if your arguments isn't an array.
validate({
validator: 'isLength',
arguments: [3, 50],
message: 'Name should be between {ARGS[0]} and {ARGS[1]} characters'
}),
// On error produces: Name should be between 3 and 50 charactersThe built in Mongoose message template variables still work as expected. You can find out more about those here: http://mongoosejs.com/docs/api.html#error_messages_MongooseError-messages
Set the type of validator type. If this is not defined, Mongoose will set this for you. Read more about this here: http://mongoosejs.com/docs/api.html#schematype_SchemaType-validate
Any additional members added to the options object will be available in the 'err.properties' field of the mongoose validation error.
var alphaValidator = validate({
validator: 'isAlphanumeric',
passIfEmpty: true,
message: 'Name should contain alpha-numeric characters only',
httpStatus: 400,
});In this example the error object returned by mongoose will have its 'properties' extended with httpStatus should validation fail. More details can be found about this here: http://thecodebarbarian.com/2014/12/19/mongoose-397
By default Mongoose runs all validators synchronously, if you need to perform asynchronous validation you can do so by returning a Promise from your validator.
validate({
validator: function (val) {
return new Promise((resolve, reject) => {
setTimeout(() => {
resolve(val > 0);
}, 500);
});
},
message: 'Count must be a positive number.',
});Custom validators can also be added - these are then added to the validator.js object. NOTE: Validator.js converts all values to strings internally for built-in validators - however custom validators do not do this. This allows you to create custom validators for checking all types such as arrays and objects.
// extend([method name], [validator], [default error message])
var extend = require('mongoose-validator').extend;
extend(
'isString',
function (val) {
return Object.prototype.toString.call(val) === '[object String]';
},
'Not a string'
);Custom validators are called normally:
validate({
validator: 'isString',
});Custom validator can be passed directly as a function:
validate({
validator: function (val) {
return val > 0;
},
message: 'Count must be a positive number.',
});NOTE: As per validator.js documentation, the currently tested value is accessed through the first argument that is automatically passed to the validator function.
Mongoose Validator can use the validator.js matches method, however, it's worth noting that the regex can be passed in 2 ways - as per the validator.js documentation, firstly they can be passed as a literal:
validate({
validator: 'matches',
arguments: /^[a-zA-Z\-]+$/i,
});or as a string with a further argument containing any required modifiers:
validate({
validator: 'matches',
arguments: ['^[a-zA-Z-]+$', 'i'],
});Special thanks to Francesco Pasqua for heavily refactoring the code into something far more future proof. Thanks also go to Igor Escobar and Todd Bluhm for their contributions.
Copyright (c) 2015 Lee Powell [email protected]
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