RunKit + 
Try any Node.js package right in your browser
This is a playground to test code. It runs a full Node.js environment and already has all of npm’s 1,000,000+ packages pre-installed, including valid-props. Try it out:
'use strict';
var props = require('valid-props'),
validator = props.create({
errorType: 'throw'
});
var invalidParamsNull = props.validate({bar: 'bar'}, {
foo: 'string',
});
if (invalidParamsNull === null) {
console.log('This value is ', invalidParamsNull); // 'This value is null'
}
try {
var invalidParamsThrow = validator.validate({bar: 'bar'}, {
foo: 'string',
});
} catch (e) {
console.error(e.message); // 'Missing properties: foo'
}
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