Alternatives: joi, yup, io-ts
Ow is a lightweight package with a small footprint, making it suitable for projects where size is a concern. Ajv, while not significantly larger, has a slightly larger codebase due to its more extensive feature set.
Ow provides a clean and intuitive API with a fluent syntax that allows for easy chaining of validation rules. It also provides descriptive error messages, making it easier to identify validation issues. Ajv has a more complex API due to its support for JSON Schema specifications, which may require a steeper learning curve for developers unfamiliar with JSON Schema.
Both Ajv and Ow are actively maintained by their respective communities. Ajv has a larger user base and a longer history of development, which ensures ongoing maintenance and updates. Ow, being a newer package, may have a smaller community but is still actively maintained and receives updates.