Ajv is a fast and feature-rich JSON schema validator for JavaScript. It allows you to define and validate JSON schemas to ensure the structure and data integrity of JSON documents. Ajv supports JSON Schema draft-04, draft-06, draft-07, and JSON Type Definition (RFC8927) standards, making it versatile for various validation needs.
Alternatives:
joi-+
yup-+
zod-+
class-validator-+
superstruct-+
jsonschema-+
fastest-validator-+
is-my-json-valid-+
tv4-+
parambulator-+
Tags: javascriptjsonschemavalidationperformance
ow
v2.0.0(3 months ago)
OW is a flexible and composable validation library for JavaScript and TypeScript. It allows developers to define validation rules for various data types and structures, enabling robust input validation in applications. OW provides a fluent API for creating validation schemas with support for chaining multiple validation rules, custom error messages, and complex data structures.
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. Ow, on the other hand, is a newer package and may not have the same level of popularity and adoption as Ajv.
Size
Ow is a lightweight package with a small codebase, which makes it suitable for projects where minimizing bundle size is a priority. Ajv, while not significantly larger, has a slightly larger codebase due to its more extensive feature set.
Functionality
Ajv is primarily focused on JSON Schema validation and provides comprehensive support for JSON Schema specifications. It offers advanced validation features, such as custom keywords and asynchronous validation. Ow, on the other hand, is a general-purpose validation library that aims to provide a simple and expressive API for validating JavaScript values.
Developer Experience
Ow provides a clean and intuitive API with a fluent syntax, making it easy to define validation rules. It also offers helpful error messages and supports TypeScript out of the box. Ajv has a more complex API due to its support for JSON Schema specifications, which may require a steeper learning curve for developers who are not familiar with JSON Schema.
Performance
Ajv is known for its excellent performance and is optimized for speed. It utilizes various techniques, such as schema compilation and caching, to achieve high validation throughput. Ow is also performant, but it may not have the same level of optimization as Ajv.
Maintenance
Both Ajv and Ow are actively maintained by their respective communities. Ajv has a larger user base and a longer history of maintenance, which ensures that it receives regular updates and bug fixes. Ow, being a newer package, may have a smaller community but is still actively maintained and has been receiving updates.
