Head-to-Head: Joi vs ow Analysis


v17.11.0(2 months ago)

This package is actively maintained.Types definitions are bundled with the npm packageNumber of direct dependencies: 5Monthly npm downloads

Joi is a powerful schema description language and data validator for JavaScript used for server side validation. With Joi, you can define rules for your data shape and structure, limit input values, and validate user inputs against those rules, ensuring the validity and integrity of your application data.

Alternatives: Yup, Validate.js, Superstruct

Tags: javascriptvalidationschemasdata-validationmodular


v1.1.1(11 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



Joi has been around for longer and has a larger user base and community support compared to Ow. It is widely used and has established itself as a popular validation library in the JavaScript ecosystem.

API Design

Joi follows a more traditional and declarative API design, where you define validation schemas using a fluent interface. Ow, on the other hand, follows a more modern and expressive API design, leveraging template literals and chaining methods for defining validation rules.


Both Joi and Ow provide a wide range of validation capabilities. Joi offers a comprehensive set of validation rules and supports complex schema definitions, making it suitable for handling complex validation scenarios. Ow, on the other hand, focuses on providing a simpler and more lightweight API, covering most common validation needs.


Joi is commonly used in server-side applications and frameworks like Hapi.js, while Ow is more commonly used in client-side applications and libraries. Both libraries can be integrated into any JavaScript project, but their usage patterns and target environments may differ.


Ow is known for its excellent performance due to its lightweight design and optimized codebase. Joi, while still performant, may have some overhead due to its extensive feature set and flexibility. The performance difference may be more noticeable in high-throughput scenarios or when dealing with large validation payloads.

Developer Experience

Joi has been around for a longer time and has a more mature ecosystem, which translates to better documentation, more community resources, and a larger number of integrations with other libraries and frameworks. Ow, being a newer library, may have a smaller community and fewer resources available, but it offers a more modern and intuitive API.