v6.7.0(9 months ago)
Ajv is primarily focused on JSON Schema validation and provides extensive support for JSON Schema draft 7 and draft 2019-09. It offers a wide range of validation keywords and supports complex validation scenarios. Runtypes, on the other hand, provides a more expressive and concise way to define runtime types in TypeScript. It allows you to define complex type structures and provides type inference for better developer experience.
Ajv is known for its high performance and is optimized for speed. It uses a code generation approach to generate validation functions, which results in faster validation. Runtypes also performs well, but it may have a slight overhead due to its focus on type inference and TypeScript integration.
Ajv has comprehensive documentation and a large community, which makes it easier to find support and examples. It has good error reporting and provides detailed validation error messages. Runtypes, being a TypeScript-first library, provides excellent developer experience with strong type checking and autocompletion in IDEs. It has a clean and intuitive API for defining types.
Both Ajv and Runtypes are actively maintained by their respective communities. Ajv has been around for a longer time and has a more mature codebase. Runtypes is relatively newer but has gained popularity and is actively maintained. It's important to consider the community support and maintenance when choosing a library for long-term projects.