node package manager


Simple is and assert predicates


This provides a simple is<Type> and assert<Type> module for Node.js. Typically these are used as validators, either for parameter testing or in unit test code.

The usual, npm, add a dependency in your package.json to validate-type and run:

$ npm install

The module provides very basic isType and assertType functions for testing. All predicates return boolean values, all assertions either return nothing or throw an AssertionError.

var Validate = require('validate');
Validate.isInteger(0); // true 
Validate.isString(0);  // false; 
Validate.assertNumber(1/0); // nothing 
Validate.assertArray('');   // Error 

Currently the following types are supported:

  • NullOrUndefined
  • String
  • Number
  • Integer
  • Float
  • Boolean
  • Date
  • Array
  • Function