Zod is a lightweight TypeScript schema validation library that is designed to make it easy to validate and sanitize complex input data. It provides a simple and intuitive syntax for defining a schema that can be used to validate objects, as well as a performant runtime validation engine that can validate data at runtime.
Runtypes and Zod provide similar features for runtime type checking, including type validation, coercion, and composition. However, Zod offers a more expressive and ergonomic API with a focus on developer experience. It provides a fluent and chainable syntax for defining types, making it easier to read and write type definitions.
Both Runtypes and Zod have excellent TypeScript support and can be seamlessly integrated into TypeScript projects. They provide accurate type inference and can be used to validate and enforce type safety at runtime.
In terms of performance, Runtypes is known to be faster than Zod. Runtypes achieves better performance by using a more optimized implementation. However, the performance difference might not be significant for most use cases, and both libraries offer acceptable runtime performance.
Both Runtypes and Zod have well-documented APIs with examples and guides. However, Zod's documentation is considered to be more comprehensive and user-friendly. It provides detailed explanations of concepts and features, making it easier for developers to get started and understand how to use the library effectively.