ajv vs joi vs jsonschema vs is-my-json-valid
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 for ensuring that data conforms to a specified format. They provide a way to define the structure of JSON data, including required fields, data types, and validation rules. These libraries help maintain data integrity and facilitate communication between different parts of an application or between different services. By using these libraries, developers can catch errors early in the data handling process, improving overall application reliability and robustness.

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ajv103,870,11214,0491.03 MB2867 months agoMIT
joi9,270,01321,043531 kB1848 months agoBSD-3-Clause
jsonschema2,939,3301,84183.5 kB64a month agoMIT
is-my-json-valid649,83796740.2 kB553 years agoMIT
Feature Comparison: ajv vs joi vs jsonschema vs is-my-json-valid

Performance

  • ajv:

    AJV is renowned for its performance, being one of the fastest JSON Schema validators available. It compiles schemas to JavaScript functions, allowing for rapid validation, making it ideal for applications that require high throughput.

  • joi:

    Joi's performance is generally good, but it may not be as fast as AJV due to its more extensive feature set and validation capabilities. It is best used in scenarios where validation complexity is high and performance is secondary.

  • jsonschema:

    jsonschema offers decent performance but is not optimized for speed like AJV. It is suitable for applications where strict adherence to the JSON Schema specification is more critical than raw performance.

  • is-my-json-valid:

    is-my-json-valid is designed to be lightweight and fast, but it may not match the performance of AJV for large datasets. It is suitable for smaller applications or where performance is not the primary concern.

Ease of Use

  • ajv:

    AJV provides a straightforward API, but its advanced features may require a deeper understanding of JSON Schema. It is well-documented, making it easier for developers to get started with basic validations.

  • joi:

    Joi offers a very expressive and intuitive API, allowing developers to define complex validation rules in a readable manner. Its fluent interface makes it easy to chain validation methods, enhancing developer productivity.

  • jsonschema:

    jsonschema has a simple API that closely follows the JSON Schema specification, making it easy to use for those familiar with the standard. However, it may lack some of the convenience features found in other libraries.

  • is-my-json-valid:

    is-my-json-valid is extremely easy to use, with a minimal learning curve. Developers can quickly implement validation with simple syntax, making it an excellent choice for beginners or small projects.

Extensibility

  • ajv:

    AJV is highly extensible, allowing developers to create custom keywords and formats. This makes it suitable for applications with unique validation requirements that go beyond standard JSON Schema capabilities.

  • joi:

    Joi is very extensible, allowing for the creation of custom validation rules and messages. This flexibility makes it ideal for applications with specific validation needs that require tailored solutions.

  • jsonschema:

    jsonschema supports extensibility through custom formats, but it is not as flexible as AJV or Joi. It is best suited for applications that require adherence to the JSON Schema standard without extensive customization.

  • is-my-json-valid:

    is-my-json-valid is less extensible compared to AJV. It is designed for straightforward validation scenarios and may not support custom validation rules as easily.

Community and Support

  • ajv:

    AJV has a large and active community, with extensive documentation and support available. This makes it easier to find solutions to common problems and stay updated with best practices.

  • joi:

    Joi benefits from a strong community and is widely used in the Node.js ecosystem. It has comprehensive documentation and many resources available for developers, making it a reliable choice for server-side validation.

  • jsonschema:

    jsonschema has a moderate community presence. While it adheres closely to the JSON Schema specification, its documentation and support may not be as extensive as that of AJV or Joi.

  • is-my-json-valid:

    is-my-json-valid has a smaller community and may not have as much support or documentation compared to larger libraries. It is best for simple projects where extensive community support is not critical.

Compliance with JSON Schema Standards

  • ajv:

    AJV supports the latest JSON Schema drafts, ensuring compliance with the most current standards. This makes it suitable for applications that require adherence to the latest specifications.

  • joi:

    Joi does not strictly adhere to JSON Schema standards but offers a rich set of validation features that can fulfill many common use cases. It is more focused on usability than strict compliance.

  • jsonschema:

    jsonschema is designed to closely follow the JSON Schema specification, making it a good choice for applications that require strict compliance with the standards.

  • is-my-json-valid:

    is-my-json-valid does not fully support all JSON Schema drafts, which may limit its use in applications requiring strict compliance with the latest standards.

How to Choose: ajv vs joi vs jsonschema vs is-my-json-valid
  • ajv:

    Choose AJV if you need a high-performance validator that supports JSON Schema draft-07 and earlier. It is known for its speed and extensibility, making it suitable for applications requiring efficient validation of large datasets.

  • joi:

    Opt for Joi if you prefer a rich and expressive API for schema validation. Joi is particularly useful for server-side validation in Node.js applications and offers a fluent interface for defining complex validation rules.

  • jsonschema:

    Use jsonschema if you need a library that adheres closely to the JSON Schema specification and offers a simple interface for validating JSON data. It is suitable for applications that require strict compliance with the JSON Schema standards.

  • is-my-json-valid:

    Select is-my-json-valid for a lightweight and straightforward validation solution. It is easy to use and integrates well into projects where simplicity and minimal dependencies are key considerations.

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 joi

joi is a powerful schema description language and data validator for JavaScript objects. It allows developers to define complex validation rules for their data structures, making it easier to ensure that incoming data meets specific criteria before processing it. Joi is particularly useful in server-side applications, where data validation is crucial for maintaining data integrity and security. While joi is a popular choice for data validation, there are several alternatives available in the ecosystem. Here are a few notable ones:

  • celebrate is a middleware for Express.js that integrates Joi for validating request data. It allows developers to define validation schemas for request parameters, query strings, and request bodies, making it easy to enforce data integrity in Express applications. Celebrate simplifies the validation process by providing a straightforward API that works seamlessly with Express, ensuring that only valid data reaches your route handlers. If you're already using Joi and want to integrate it into your Express application, Celebrate is an excellent choice.
  • express-validator is another popular middleware for validating and sanitizing request data in Express applications. Unlike Joi, which focuses on schema-based validation, express-validator uses a set of validation and sanitization middlewares that can be applied to individual routes. This flexibility allows developers to define validation rules directly in their route definitions. If you prefer a more modular approach to validation and want to keep your validation logic close to your route handlers, express-validator is a great alternative.
  • yup is a JavaScript schema builder for value parsing and validation. It is similar to Joi but offers a more modern API and is often favored for its promise-based validation and support for asynchronous validation. Yup is particularly useful for client-side validation in React applications, but it can also be used in server-side contexts. If you're looking for a lightweight and flexible validation library that works well with both client and server applications, Yup is worth considering.

To explore how joi compares with celebrate, express-validator, and yup, check out the comparison: Comparing celebrate vs express-validator vs joi 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 is-my-json-valid

is-my-json-valid is a JSON schema validator for JavaScript that allows developers to validate JSON data against a specified schema. It is designed to be fast and efficient, making it suitable for applications where performance is critical. By using is-my-json-valid, developers can ensure that their JSON data adheres to the expected structure and types, helping to prevent errors and improve data integrity. However, there are several alternatives in the ecosystem that also provide JSON validation capabilities. Here are a few notable ones:

  • ajv (Another JSON Schema Validator) is a highly performant JSON schema validator that supports the latest JSON Schema standards. It is known for its speed and flexibility, allowing developers to validate JSON data with various schema formats. ajv also supports asynchronous validation and custom keywords, making it a powerful choice for complex validation scenarios. If you need a robust and feature-rich validator that adheres to the latest standards, ajv is an excellent option.

  • joi is a popular schema description language and data validator for JavaScript. It allows developers to create complex validation rules using a fluent API, making it easy to define and validate data structures. joi is particularly useful for validating objects and can be integrated seamlessly with Node.js applications. If you prefer a more expressive and flexible way to define validation rules, joi is a great choice.

  • jsonschema is another library for validating JSON data against a JSON Schema. It is straightforward to use and provides a simple API for validating data structures. jsonschema is particularly useful for projects that require compliance with JSON Schema standards without the need for advanced features. If you are looking for a lightweight and easy-to-use validator, jsonschema could be the right fit.

To compare these packages, check out the following link: Comparing ajv vs is-my-json-valid vs joi vs jsonschema.

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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