joi

What problem does it solve?

Joi helps you prevent invalid or malformed request data from breaking your application by enforcing a consistent schema at input boundaries.

Core Features & Use Cases

• Schema-driven validation: Define objects, arrays, and primitive constraints so only expected shapes and values pass.
• Cross-field and dynamic rules: Use references for relationships between fields and conditional logic with .when() to express real business rules.
• Extensibility and better errors: Create custom types/extensions and tailor error messages for clearer feedback during API or form handling.

Quick Start

Use the joi skill to validate incoming input by defining a Joi.object() schema and calling validate(input) to obtain both the validated value and any structured error.