Head-to-Head: Ajv vs Runtypes Analysis

ajv

v8.12.0(about 1 year ago)

This package was last published over a year ago. It may not be actively maintained.Types definitions are bundled with the npm packageNumber of direct dependencies: 4Monthly npm downloads

Ajv is a powerful and efficient JSON schema validator for JavaScript. It allows you to define and validate JSON schemas, ensuring that your data conforms to a specific structure and set of rules. Ajv supports the JSON Schema draft-07 specification and provides a comprehensive set of validation keywords and options.

Alternatives:
joi+
yup+
zod+
class-validator+
superstruct+
jsonschema+
fastest-validator+
is-my-json-valid+
tv4+
schema-utils+

Tags: javascriptjsonschemavalidationvalidator

runtypes

v6.7.0(9 months ago)

This package is actively maintained.Types definitions are bundled with the npm packageNumber of direct dependencies: 0Monthly npm downloads

Runtypes is a lightweight and powerful runtime type system for JavaScript and TypeScript. It allows you to define and enforce type constraints on your data at runtime, providing runtime type checking and validation. With Runtypes, you can easily define complex data structures, validate input data, and ensure type safety in your applications.

Alternatives:
io-ts+
zod+
yup+
ajv+
joi+
class-validator+
superstruct+
prop-types+
ts-json-schema-generator+
typebox+

Tags: javascripttypescripttype-checkingruntime-type-systemvalidation

Fight!

Popularity

Ajv is a widely used JSON Schema validator and has been around for a longer time. It has a large user base and is well-established in the JavaScript community. Runtypes, on the other hand, is a newer library and has gained popularity for its type validation capabilities.

Validation Features

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.

Integration

Ajv can be used with various JavaScript environments and supports both synchronous and asynchronous validation. It has integrations with popular frameworks like Express and supports custom formats and keywords. Runtypes, on the other hand, is specifically designed for TypeScript and integrates seamlessly with TypeScript projects. It leverages TypeScript's type system and provides better type safety during development.

Performance

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.

Developer Experience

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.

Maintenance

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.