A fluent, chainable JavaScript validation library with a simple API for validating any data type.
v8n is a JavaScript validation library that provides a fluent, chainable API for validating data of any type, including primitives, arrays, and objects. It solves the problem of writing verbose and complex validation logic by offering an intuitive syntax that reads like English, making it easy to create, reuse, and share validation rules.
JavaScript developers working on frontend or backend applications who need robust, flexible, and maintainable data validation, especially those building forms, APIs, or data processing pipelines.
Developers choose v8n for its exceptionally fluent API that reduces boilerplate, its support for custom rules and asynchronous validation, and its ability to handle complex validation scenarios with minimal code while maintaining readability and reusability.
☑️ JavaScript fluent validation library
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Enables readable, English-like validation chains that reduce boilerplate, as demonstrated in examples where complex rules like 'some.not.uppercase()' are expressed intuitively.
Allows seamless integration of user-defined validation functions via .extend(), treating them like built-in rules, shown with the 'foo' custom rule example.
Supports boolean tests, exception-based validation, failure lists, and async checks, providing flexibility for different scenarios like backend API validation.
Validations can be exported and imported as JavaScript modules, promoting code reuse across projects, illustrated in the 'specialNumber.js' example.
Lacks direct integration with UI frameworks, requiring additional setup for form validation in frontend applications compared to libraries like Formik or Vuelidate.
As a smaller library, it has fewer community-contributed rules or extensions, which might necessitate custom work for niche validation scenarios.
The fluency comes with a learning curve; understanding how modifiers like 'not' and 'some' interact can be confusing, as noted in examples where order changes meaning significantly.