ajv vs jsonschema vs z-schema vs @hyperjump/json-schema
JSON Schema Validation Libraries Comparison
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What's JSON Schema Validation Libraries?

JSON Schema validation libraries are essential tools in web development that enable developers to validate JSON data structures against defined schemas. These libraries help ensure that the data conforms to expected formats, types, and constraints, which is crucial for maintaining data integrity and preventing errors in applications. By utilizing these libraries, developers can automate the validation process, improve data handling, and enhance the overall robustness of their applications.

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ajv141,231,07014,1991.03 MB29410 months agoMIT
jsonschema3,883,0711,85083.5 kB654 months agoMIT
z-schema2,482,1563382.07 MB3810 months agoMIT
@hyperjump/json-schema78,653258315 kB55 days agoMIT
Feature Comparison: ajv vs jsonschema vs z-schema vs @hyperjump/json-schema

Performance

  • ajv:

    ajv is known for its exceptional speed, often considered one of the fastest JSON Schema validators available. It compiles schemas into efficient JavaScript functions, which can be reused for multiple validation calls, enhancing performance.

  • jsonschema:

    jsonschema is relatively slower compared to others, as it focuses on simplicity and ease of use rather than raw performance. It is suitable for smaller applications where speed is not a critical factor.

  • z-schema:

    z-schema offers good performance but may not match the speed of ajv. It provides a balance between performance and feature richness, making it suitable for applications that require advanced validation features.

  • @hyperjump/json-schema:

    @hyperjump/json-schema is designed for high performance, utilizing a compilation approach that speeds up the validation process significantly, especially beneficial for applications handling large volumes of data.

Schema Support

  • ajv:

    ajv supports JSON Schema draft-07 and is known for its comprehensive support for various schema features, including references and validation of complex data structures.

  • jsonschema:

    jsonschema primarily supports draft-04 of JSON Schema, which may limit its use in projects requiring the latest schema features. It is best for simple validation needs.

  • z-schema:

    z-schema supports the latest drafts of JSON Schema and includes features like schema referencing and better error reporting, making it a robust choice for complex validation scenarios.

  • @hyperjump/json-schema:

    @hyperjump/json-schema supports the latest JSON Schema drafts, including advanced features like custom keywords and asynchronous validation, making it versatile for complex schema requirements.

Error Reporting

  • ajv:

    ajv offers comprehensive error reporting, including detailed messages and paths to the invalid data, making it easier for developers to understand and fix validation errors.

  • jsonschema:

    jsonschema provides basic error reporting, which may not be as detailed as other libraries, but is sufficient for simple validation tasks.

  • z-schema:

    z-schema excels in error reporting by providing clear and structured error messages, helping developers pinpoint validation failures effectively.

  • @hyperjump/json-schema:

    @hyperjump/json-schema provides detailed error messages that help developers quickly identify validation issues, which is crucial for debugging and improving data handling.

Extensibility

  • ajv:

    ajv supports custom keywords and allows for schema compilation, making it extensible for developers who need to implement specific validation logic beyond standard JSON Schema.

  • jsonschema:

    jsonschema has limited extensibility options, focusing more on straightforward validation without extensive customization capabilities.

  • z-schema:

    z-schema allows for some level of extensibility, including custom formats and keywords, but may not be as flexible as @hyperjump/json-schema or ajv.

  • @hyperjump/json-schema:

    @hyperjump/json-schema is highly extensible, allowing developers to create custom validation keywords and functions, making it suitable for applications with unique validation requirements.

Learning Curve

  • ajv:

    ajv is relatively easy to learn for developers with prior experience in JSON Schema, thanks to its clear documentation and straightforward API, making it accessible for most users.

  • jsonschema:

    jsonschema has a gentle learning curve, making it an excellent choice for beginners or those needing basic validation without complex configurations.

  • z-schema:

    z-schema has a moderate learning curve, with a focus on providing advanced features that may require additional time to fully understand and utilize effectively.

  • @hyperjump/json-schema:

    @hyperjump/json-schema has a moderate learning curve, especially for developers familiar with JSON Schema concepts, but offers advanced features that may require additional understanding.

How to Choose: ajv vs jsonschema vs z-schema vs @hyperjump/json-schema
  • ajv:

    Select ajv for its speed and efficiency, especially if you require a highly performant validator that supports JSON Schema draft-07 and offers features like schema compilation and asynchronous validation.

  • jsonschema:

    Opt for jsonschema if you prefer a simple and straightforward library that is easy to use for basic validation needs, particularly in smaller projects or where simplicity is key.

  • z-schema:

    Consider z-schema if you need a library that supports the latest JSON Schema drafts and offers additional features like schema referencing and better error reporting.

  • @hyperjump/json-schema:

    Choose @hyperjump/json-schema if you need a library that focuses on performance and supports advanced features like asynchronous validation and custom keywords, making it suitable for complex validation scenarios.

Similar Npm Packages to ajv

ajv is a JSON Schema validator for JavaScript, designed to validate JSON objects against a defined schema. It is known for its speed and efficiency, making it a popular choice for developers who need to ensure that their data adheres to specific formats and structures. While ajv is a robust solution for JSON validation, there are several alternatives available in the ecosystem. Here are a few noteworthy options:

  • joi is a powerful schema description language and data validator for JavaScript. It allows developers to create complex validation rules with a fluent and expressive API. Joi is particularly well-suited for validating objects and can handle various data types, including strings, numbers, arrays, and more. If you need a comprehensive validation library that provides extensive features and a user-friendly syntax, Joi is an excellent choice.

  • jsonschema is a library that provides JSON Schema validation for JavaScript. It is a straightforward implementation of the JSON Schema specification, allowing developers to validate JSON objects against defined schemas. While it may not be as feature-rich as some other libraries, jsonschema is easy to use and integrates well with existing projects. If you are looking for a simple and compliant way to validate JSON data, jsonschema is a solid option.

  • validator is a library that provides a set of string validators and sanitizers. While it is not a schema validation library per se, it offers a wide range of validation functions for common use cases, such as email validation, URL validation, and more. If your validation needs are primarily focused on string inputs and you require a lightweight solution, the validator library can be a good fit.

  • yup is a JavaScript schema builder for value parsing and validation. It is particularly popular in the context of form validation in React applications. Yup provides a simple and intuitive API for defining validation schemas and can handle asynchronous validation as well. If you are working with forms and need a library that integrates seamlessly with React, Yup is a great choice.

To explore how ajv compares with joi, jsonschema, validator, and yup, check out the comparison: Comparing ajv vs joi vs jsonschema vs validator vs yup.

Similar Npm Packages to jsonschema

jsonschema is a validation library for JavaScript that allows developers to validate JSON data against a defined schema. It is particularly useful for ensuring that the data structure adheres to specific rules, making it easier to maintain data integrity in applications. While jsonschema provides a robust solution for JSON validation, there are several alternatives in the JavaScript ecosystem that offer similar functionality. Here are a few noteworthy options:

  • ajv (Another JSON Schema Validator) is a fast and efficient JSON schema validator that supports the latest JSON Schema standards. It is known for its performance and flexibility, allowing developers to validate complex data structures with ease. ajv also supports asynchronous validation and custom keywords, making it a powerful choice for applications that require extensive validation capabilities. If you need a high-performance solution for validating JSON data, ajv is an excellent option.

  • joi is a powerful schema description language and data validator for JavaScript objects. It provides a rich set of features for defining schemas and validating data, including support for complex types, custom validation rules, and error messages. joi is particularly popular in Node.js applications and is often used for validating request payloads in APIs. If you are looking for a comprehensive validation library that integrates well with JavaScript objects, joi is a great choice.

  • yup is a JavaScript schema builder for value parsing and validation. It is inspired by joi but is designed to work seamlessly with React and other modern JavaScript frameworks. yup provides a fluent API for defining schemas and supports asynchronous validation, making it suitable for form validation in client-side applications. If you are building a React application and need a validation library that integrates well with forms, yup is an excellent option.

  • z-schema is another JSON schema validator that focuses on performance and extensibility. It supports the latest JSON Schema drafts and offers features like asynchronous validation and custom formats. z-schema is designed to be lightweight and fast, making it suitable for applications that require efficient data validation without sacrificing functionality.

To see how jsonschema compares with ajv, joi, yup, and z-schema, check out the comparison: Comparing ajv vs joi vs jsonschema vs yup vs z-schema.

Similar Npm Packages to z-schema

z-schema is a JSON schema validator that allows developers to validate JSON objects against defined schemas. It is designed for performance and supports the latest JSON Schema specifications, making it a popular choice for applications that require robust data validation. While z-schema provides a solid solution for JSON validation, there are several alternatives in the ecosystem that also offer similar functionalities. Here are a few notable options:

  • ajv (Another JSON Schema Validator) is one of the fastest JSON schema validators available. It supports the latest JSON Schema drafts and offers features like asynchronous validation, custom keywords, and a powerful compilation mechanism for schemas. If performance is a key concern for your application, or if you need extensive support for JSON Schema features, ajv is an excellent choice.
  • joi is a popular validation library that allows developers to create schemas for JavaScript objects. While it is not strictly a JSON schema validator, it provides a rich and expressive API for defining complex validation rules. joi is particularly useful for server-side validation in Node.js applications, where you need to validate incoming request data. If you prefer a more programmatic approach to validation with a focus on JavaScript objects, joi is a strong contender.
  • jsonschema is another JSON schema validator that is simple to use and adheres closely to the JSON Schema specification. It provides a straightforward API for validating JSON objects against schemas and is suitable for both client-side and server-side applications. If you are looking for a lightweight and easy-to-use library for JSON schema validation, jsonschema is a good option.

To explore how z-schema compares with ajv, joi, and jsonschema, check out the comparison: Comparing ajv vs joi vs jsonschema vs z-schema.

Similar Npm Packages to @hyperjump/json-schema

@hyperjump/json-schema is a powerful library for validating JSON data against JSON Schema specifications. It provides a flexible and efficient way to ensure that your JSON data adheres to defined structures and types, making it easier to maintain data integrity in applications. This library is particularly useful in scenarios where data validation is critical, such as APIs, configuration files, and data interchange between systems.

While @hyperjump/json-schema offers robust validation capabilities, there are several alternatives in the ecosystem that also provide JSON schema validation. Here are a few notable ones:

  • ajv (Another JSON Schema Validator) is one of the most popular JSON schema validation libraries. It is known for its speed and compliance with the latest JSON Schema standards. ajv supports asynchronous validation, custom keywords, and formats, making it a versatile choice for developers who need a high-performance validator. If you are looking for a well-established library with extensive features and community support, ajv is an excellent option.

  • jsonschema is a simple and easy-to-use library for validating JSON data against schemas. It follows the JSON Schema specification and provides a straightforward API for validation. While it may not be as feature-rich as some of the other libraries, jsonschema is a great choice for projects that require basic validation without the overhead of more complex libraries. Its simplicity makes it suitable for smaller applications or for developers who prefer a minimalistic approach.

  • z-schema is another JSON schema validator that focuses on performance and extensibility. It supports the latest JSON Schema drafts and offers features like custom formats and asynchronous validation. z-schema is designed for speed and can handle large schemas efficiently. If performance is a critical factor for your application, z-schema may be a suitable alternative.

To explore how @hyperjump/json-schema compares with ajv, jsonschema, and z-schema, check out the comparison: Comparing @hyperjump/json-schema vs ajv vs jsonschema vs z-schema.

README for ajv
Ajv logo

 

Ajv JSON schema validator

The fastest JSON validator for Node.js and browser.

Supports JSON Schema draft-04/06/07/2019-09/2020-12 (draft-04 support requires ajv-draft-04 package) and JSON Type Definition RFC8927.

build npm npm downloads Coverage Status SimpleX Gitter GitHub Sponsors

Ajv sponsors

Mozilla

Microsoft

RetoolTideliftSimpleX

Contributing

More than 100 people contributed to Ajv, and we would love to have you join the development. We welcome implementing new features that will benefit many users and ideas to improve our documentation.

Please review Contributing guidelines and Code components.

Documentation

All documentation is available on the Ajv website.

Some useful site links:

Please sponsor Ajv development

Since I asked to support Ajv development 40 people and 6 organizations contributed via GitHub and OpenCollective - this support helped receiving the MOSS grant!

Your continuing support is very important - the funds will be used to develop and maintain Ajv once the next major version is released.

Please sponsor Ajv via:

Thank you.

Open Collective sponsors

Performance

Ajv generates code to turn JSON Schemas into super-fast validation functions that are efficient for v8 optimization.

Currently Ajv is the fastest and the most standard compliant validator according to these benchmarks:

Performance of different validators by json-schema-benchmark:

performance

Features

Install

To install version 8:

npm install ajv

Getting started

Try it in the Node.js REPL: https://runkit.com/npm/ajv

In JavaScript:

// or ESM/TypeScript import
import Ajv from "ajv"
// Node.js require:
const Ajv = require("ajv")

const ajv = new Ajv() // options can be passed, e.g. {allErrors: true}

const schema = {
  type: "object",
  properties: {
    foo: {type: "integer"},
    bar: {type: "string"},
  },
  required: ["foo"],
  additionalProperties: false,
}

const data = {
  foo: 1,
  bar: "abc",
}

const validate = ajv.compile(schema)
const valid = validate(data)
if (!valid) console.log(validate.errors)

Learn how to use Ajv and see more examples in the Guide: getting started

Changes history

See https://github.com/ajv-validator/ajv/releases

Please note: Changes in version 8.0.0

Version 7.0.0

Version 6.0.0.

Code of conduct

Please review and follow the Code of conduct.

Please report any unacceptable behaviour to ajv.validator@gmail.com - it will be reviewed by the project team.

Security contact

To report a security vulnerability, please use the Tidelift security contact. Tidelift will coordinate the fix and disclosure. Please do NOT report security vulnerabilities via GitHub issues.

Open-source software support

Ajv is a part of Tidelift subscription - it provides a centralised support to open-source software users, in addition to the support provided by software maintainers.

License

MIT

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