node-verifier

##Usage

var Verifier = require('node-verifier');

// init the rules for verify
var myValueVerifier = new Verifier(['type number', 'min_length 1', 'min_value 5']);
// equal
var myValueVerifier = new Verifier(['type "number"', 'min_length "1"', 'min_value "5"']);
// equal
var myValueVerifier = new Verifier([{type: 'number'}, {min_length: 1}, {min_value: 5}]);

// final - verify!
myValueVerifier.verify(value, function (err) {

    if (err instanceof Verifier.ValidationError) {
        // invalid!!!!
        console.log(err.rule);
        console.log(err.params);
        console.log(err.index);
        return;
    }

    // valid!!!
});

Predefined Rules:

You can verify any rule without verifier object

var Verifier = require('node-verifier');
var RuleType = Verifier.Rule.get('type');

var var rule = new RuleType('object');

rule.verify(value, function (err) {
    if (err instanceof Verifier.Rule.ValidationError) {
        // if invalid

        return;
    }

    // if valid
});

You can create your own rules. There is one required method check (value, params, done). It give 3 arguments: value - value that need check. params - params that you set in constructor. done - callback. First argument is validation error (Verifier.Rule.ValidationError). Second argument is result for error. if you set true then generate ValidationError automatically.

There is one optional function prepareParams(params) for obtain the fail-fast paradigm. (it call in constructor). if you throw the error - error will arrive in main loop

var Verifier = require('node-verifier');

var UserExistsRule = Verifier.Rule.extend({
    check: function (value, params, done) {
        if (!_.isPlainObject(value) || !_.has(value, 'email') || !_.has(value, 'password')) {
            done(new Error('rule params must be object {email: NAME_STRING, password: PASSWORD_STRING}'), false);
            return;
        }

        knex('user').where('email', params.email).exec(function (err, userArray) {
            if (!err && userArray && userArray.length === 1 && userArray[0].password === sha1(params.password)) {
                done(null, true);
                return;
            }

            done(err, false);
        });
    }
});

Verifier.Rule.add('userExists');

var myValidator = new Verifier(['type object', 'userExists']);

myValidator.verify({ email: '[email protected]', password: 123123123 }, function (err) {
    if (err instanceof Verifier.ValidationError) {
        // invalid
        return;
    }

    // valid
});

You can extend any exists rules

var Verifier = require('node-verifier');
var RuleType = Verifier.Rule.get('type');

var MyRuleType = RuleType.extend({
    prepareParams: function (params) {
        return Object.prototype.toString.call(params);
    }
});

// register new rule
Verifier.Rule.add('my-type', MyRuleType);

each

For array item validation. params - rules for verify.

var myValueVerifier = new Verifier({each: ['type number', 'min_length 1', 'min_value 5']});

myValueVerifier.verify( [ 5, 3 ], function (err) {
    console.log(err); // null
});

myValueVerifier.verify( [ 3, "5" ], function (err) {
    console.log(err.rule); // 'type'
    console.log(err.params); // 'number'
    console.log(err.index); // 1
});

email

no params

check the email format by https://www.npmjs.org/package/email-validator

empty

no params

check value on false, 0, "", null, undefined, [], {}

eq

result of _.isEqual (lodash)

var myVerifier = new Verifier('eq 5');
// equal
var myVerifier = new Verifier({ eq: 5 });

myVerifier.verify(3, callback);  // invalid
myVerifier.verify("5", callback);  // invalid
myVerifier.verify(5, callback); // valid

exact_length

for string and arrays param - number

var myVerifier = new Verifier('exact_length 5');
// equal
var myVerifier = new Verifier({ exact_length: 5 });

myVerifier.verify("asdasdasd", callback);  // invalid
myVerifier.verify("asdas", callback); // valid

format

check value on RegExp match param - regExp (string)

var myVerifier = new Verifier('format ^[a-zA-Z][a-zA-Z0-9_.-]*@[a-zA-Z0-9]+\\.[a-zA-Z0-9]+$');
// equal
var myVerifier = new Verifier({format: /^[a-zA-Z][a-zA-Z0-9_.-]*@[a-zA-Z0-9]+\.[a-zA-Z0-9]+$/);

myVerifier.verify("[email protected]", callback);  // valid
myVerifier.verify("asdasdasd@asd", callback); // invalid

max_length

for string and arrays

var myVerifier = new Verifier('max_length 3');
myVerifier.verify(null, callback); // invalid
myVerifier.verify([1], callback);  // valid
myVerifier.verify([1, 2, 3], callback); // valid
myVerifier.verify("123", callback); // valid
myVerifier.verify(123, callback); // valid (convert to String)
myVerifier.verify(NaN, callback); // invalid

min_length

for string and arrays

var myVerifier = new Verifier('min_length 3');
myVerifier.verify(null, callback); // invalid
myVerifier.verify([1], callback);  // invalid
myVerifier.verify([1, 2, 3], callback); // valid
myVerifier.verify("123", callback); // valid
myVerifier.verify(123, callback); // valid (convert to String)
myVerifier.verify(NaN, callback); // invalid

max_value

check number

var myVerifier = new Verifier('max_value 3');
myVerifier.verify(4, callback); // valid
myVerifier.verify("4", callback); // valid (convert to float)

min_value

check number. param - number

var myVerifier = new Verifier('min_value 3');
myVerifier.verify(value, callback);

not

params - rule(s) for negation

var myVerifier = new Verifier({ not: ['required', 'type number', 'eq 3'] });
myVerifier.verify(value, callback);

required

check this value on undefined only. params not need.

var myVerifier = new Verifier({ required: true});
// equal
var myVerifier = new Verifier('required');

myVerifier.verify(value, callback);

type

check on type by Object.prototype.toString.call(value). param - type name without '[Object' and ']' in lower case

var myVerifier = new Verifier({ type: 'object'});
// equal
var myVerifier = new Verifier('type object');

myVerifier.verify(value, callback);

any

True if any verification branch is valid.

var myVerifier = new Verifier({
    any: [
        ['type string', {contains: ["hello", "world"]}], // branch 1
        'type number',                                   // branch 2
    ]
});
// Equal
var myVerifier = new Verifier({
    any: {
        branch1: ['type string', {contains: ["hello", "world"]}],
        branch2: 'type number'                           // branch 2
    }
});

myVerifier.verify(value, callback);

contains

True if any item of haystack array is equal with value

var myVerifier = new Verifier({contains: [1, 2, 3, 4]});
myVerifier.verify(value, callback);