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ow

Function argument validation for humans


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752K
decreased by-6.35%
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What is ow?

The 'ow' npm package is a powerful and expressive validation library for Node.js. It allows developers to validate arguments and inputs in a concise and readable manner. 'ow' provides a variety of built-in validators and supports custom validation logic, making it a versatile tool for ensuring data integrity in applications.

What are ow's main functionalities?

Basic Type Validation

This feature allows you to validate the type of a variable. In this example, the function `validateString` checks if the input is a string. If the input is not a string, an error is thrown.

const ow = require('ow');

const validateString = (input) => {
  ow(input, ow.string);
};

validateString('Hello, World!'); // Passes
validateString(123); // Throws an error

Complex Object Validation

This feature allows you to validate the shape and properties of an object. In this example, the function `validateUser` checks if the user object has a `name` property that is a string with a minimum length of 3 and an `age` property that is a positive integer.

const ow = require('ow');

const validateUser = (user) => {
  ow(user, ow.object.exactShape({
    name: ow.string.minLength(3),
    age: ow.number.integer.positive
  }));
};

validateUser({ name: 'Alice', age: 25 }); // Passes
validateUser({ name: 'Al', age: -5 }); // Throws an error

Custom Validation

This feature allows you to create custom validation logic. In this example, the function `validateEvenNumber` checks if the input is an even number. If the input is not an even number, an error is thrown with a custom message.

const ow = require('ow');

const validateEvenNumber = (input) => {
  ow(input, ow.number.validate(n => ({
    validator: n % 2 === 0,
    message: 'Expected an even number'
  })));
};

validateEvenNumber(4); // Passes
validateEvenNumber(3); // Throws an error

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Package last updated on 05 May 2024

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