Head-to-Head: ow vs Runtypes Analysis


v1.1.1(8 months ago)

This package is actively maintained.The package doesn't have any types definitionsNumber of direct dependencies: 5Monthly npm downloads

OW is a powerful and flexible JavaScript library for validating and asserting the types and shapes of JavaScript values. It provides a simple and intuitive API for defining validation rules and checking if values meet those rules. OW supports various types of validations including primitive types, arrays, objects, functions, and more.

Alternatives: joi, yup, io-ts

Tags: javascriptvalidationassertiontypesshapes


v6.7.0(4 months ago)

This package is actively maintained.Types definitions are bundled with the npm packageNumber of direct dependencies: 0Monthly npm downloads

Runtypes is a lightweight and powerful runtime type system for JavaScript and TypeScript. It allows you to define and enforce type constraints on your data at runtime, providing runtime type checking and validation. With Runtypes, you can easily define complex data structures, validate input data, and ensure type safety in your applications.

Alternatives: prop-types, io-ts, ts-runtime

Tags: javascripttypescripttype-checkingruntime-type-systemvalidation



Both Ow and Runtypes are popular npm packages in the JavaScript community, but Runtypes has gained more popularity and traction in recent years. It has a larger user base and a more active community.


Ow and Runtypes are both libraries for runtime type checking in JavaScript. However, Ow focuses on providing a simple and expressive API for type validation, while Runtypes offers a more powerful and expressive type system with features like union types, intersection types, and more advanced type checking capabilities.

Developer Experience

Ow provides a very intuitive and easy-to-use API, making it beginner-friendly and quick to get started with. Runtypes, on the other hand, has a steeper learning curve due to its more advanced type system, but it offers more flexibility and control for complex type validations.


Both libraries can be easily integrated into JavaScript and TypeScript projects. Ow has a smaller footprint and fewer dependencies, making it lightweight and suitable for smaller projects. Runtypes, on the other hand, has more extensive type checking capabilities and is well-suited for larger projects with complex type requirements.


Both Ow and Runtypes have well-documented APIs and provide examples and guides to help developers understand and use the libraries effectively. However, Runtypes has more comprehensive documentation and a larger community, which can be beneficial when seeking support or finding resources.


Both libraries are actively maintained by their respective communities. Ow has a smaller codebase and simpler functionality, which makes it easier to maintain. Runtypes, being a more feature-rich library, requires more maintenance and updates to keep up with evolving JavaScript and TypeScript standards.