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You can tell to use any A compatible promise implemention like this: There are already many validation libraries out there today but most of them are very tightly coupled to a language or framework.

The goal of is to provide a cross framework and cross language way of validating data.

Any A type promise can be used, just override function success(attributes) function error(errors) var constraints = ; var attributes = ; // Will call the success function and log validate.async(attributes, constraints).then(success, error); // Will call the error function validate.async(, constraints).then(success, error); function Validation Errors(errors, options, attributes, constraints) Validation Errors.prototype = new Error(); // This isn't supported by the ES6 promises validate.async(, constraints, ) .then(success) .catch(Validation Errors, function(error) ) .catch(function(error) ); // Supporting another promise implementation (RSVP in this case) validate. Promise; Sometimes you only want to validate a single value against some constraints and using the normal validate function is quite verbose so there is a shorthand for this.

It does little more than proxying the call do the main validation function but with the value wrapped in an object and the options full Messages and format set to also has limited support for nested objects (objects within objects) using the dot notation.

Unless otherwise specified you can always specify the message option to customize the message returned if the validator doesn't pass.