ajv vs zod vs joi vs yup vs class-validator
JavaScript Validation Libraries Comparison
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What's JavaScript Validation Libraries?

JavaScript validation libraries are essential tools for ensuring that data conforms to specified formats and rules before processing it in applications. They help developers enforce data integrity, improve user experience by providing immediate feedback, and prevent errors that could arise from invalid data inputs. Each of these libraries offers unique features and approaches to data validation, catering to different use cases and developer preferences.

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ajv135,788,03114,1461.03 MB2929 months agoMIT
zod25,693,68337,080699 kB6202 months agoMIT
joi11,663,73421,067531 kB18610 months agoBSD-3-Clause
yup7,317,09223,303260 kB2464 months agoMIT
class-validator4,169,37211,3325.12 MB302a year agoMIT
Feature Comparison: ajv vs zod vs joi vs yup vs class-validator

Performance

  • ajv:

    AJV is known for its high performance, especially when validating large JSON datasets. It compiles schemas into efficient JavaScript functions, allowing for rapid validation without sacrificing accuracy. This makes it ideal for applications that require fast validation processes.

  • zod:

    Zod provides excellent performance, particularly in TypeScript environments. It is lightweight and fast, making it a good choice for applications that require quick validation without overhead.

  • joi:

    Joi offers good performance but can be slower than AJV due to its extensive feature set and flexibility. It is suitable for applications where validation complexity is high, and performance is a secondary concern.

  • yup:

    Yup is designed for usability and integrates well with React. Its performance is generally good, but it may not match the raw speed of AJV in high-load scenarios. It's optimized for form validation rather than bulk data validation.

  • class-validator:

    While class-validator is not as performance-optimized as AJV, it provides adequate performance for most applications, especially those that leverage TypeScript. The performance is sufficient for typical use cases involving class-based validation.

Ease of Use

  • ajv:

    AJV has a steeper learning curve due to its reliance on JSON Schema syntax, which may be unfamiliar to some developers. However, once mastered, it offers powerful validation capabilities.

  • zod:

    Zod is designed to be simple and intuitive, with a focus on TypeScript users. Its API is straightforward, allowing developers to define schemas with minimal boilerplate.

  • joi:

    Joi's API is highly expressive and allows for complex validation rules to be defined in a clear manner. Its chaining syntax is user-friendly, making it accessible for developers of all skill levels.

  • yup:

    Yup is particularly user-friendly, especially for React developers. Its fluent API allows for straightforward schema definitions, making it easy to implement validation in forms.

  • class-validator:

    Class-validator is easy to use for TypeScript developers, as it utilizes decorators that integrate naturally with class definitions. This makes it intuitive for those familiar with object-oriented programming.

Integration

  • ajv:

    AJV can be easily integrated into various frameworks and libraries, especially those that utilize JSON for data interchange. Its compatibility with JSON Schema makes it versatile for different applications.

  • zod:

    Zod is also designed for TypeScript-first applications, providing excellent integration with TypeScript projects. Its focus on type safety makes it a great choice for modern web applications.

  • joi:

    Joi is widely used in Node.js applications and integrates well with frameworks like Hapi and Express. Its flexibility allows it to be used in various contexts, from API validation to form validation.

  • yup:

    Yup is designed with React in mind, making it an excellent choice for form validation in React applications, particularly when used alongside Formik. Its integration with React hooks enhances its usability.

  • class-validator:

    Class-validator integrates seamlessly with TypeScript and works well with frameworks like NestJS. Its decorator-based approach makes it a natural fit for applications that use class-based structures.

Schema Definition

  • ajv:

    AJV uses JSON Schema for schema definitions, which is a standardized way to describe the structure of JSON data. This allows for complex validation rules but requires familiarity with JSON Schema specifications.

  • zod:

    Zod emphasizes type inference and safety in schema definitions, allowing developers to define schemas that are tightly coupled with TypeScript types. This reduces the risk of runtime errors due to type mismatches.

  • joi:

    Joi provides a powerful and flexible schema definition language that allows for complex validation rules to be expressed in a clear and concise manner. Its chaining syntax makes it easy to construct schemas.

  • yup:

    Yup also offers a fluent API for schema definition, allowing developers to build complex validation rules in a straightforward manner. Its syntax is particularly friendly for form validations.

  • class-validator:

    Class-validator allows schema definition directly within TypeScript classes using decorators, making it easy to define validation rules alongside data models. This approach enhances readability and maintainability.

Community and Support

  • ajv:

    AJV has a strong community and is widely used in various applications, which means there is ample support and documentation available. However, its reliance on JSON Schema can be a barrier for some users.

  • zod:

    Zod is newer but has quickly gained traction in the TypeScript community. Its focus on type safety resonates well with TypeScript developers, and community support is growing.

  • joi:

    Joi has a large user base and a wealth of resources, tutorials, and community support available. Its longevity in the ecosystem means that many developers are familiar with its features and usage.

  • yup:

    Yup has gained popularity in the React community, leading to a growing number of resources and community support. Its integration with popular libraries like Formik enhances its visibility and usage.

  • class-validator:

    Class-validator is well-supported within the TypeScript community, particularly among developers using NestJS. Its documentation is clear and helpful for new users.

How to Choose: ajv vs zod vs joi vs yup vs class-validator
  • ajv:

    Choose AJV if you need high-performance JSON schema validation and want to leverage the power of JSON Schema Draft 7 and beyond. It is particularly suitable for applications that require strict adherence to JSON standards and need to validate large datasets efficiently.

  • zod:

    Choose Zod if you want a TypeScript-first schema declaration and validation library that emphasizes type inference and safety. Zod is particularly beneficial for projects that prioritize type safety and want to ensure that validation logic is tightly coupled with TypeScript types.

  • joi:

    Select Joi if you are looking for a comprehensive and flexible validation library that provides a rich API for defining complex validation rules. It is well-suited for applications that require extensive validation logic and want to handle both synchronous and asynchronous validations easily.

  • yup:

    Use Yup if you prefer a schema builder for value parsing and validation that integrates well with React and Formik. Yup's fluent API allows for easy construction of validation schemas, making it a great choice for form validation in modern web applications.

  • class-validator:

    Opt for class-validator if you are working with TypeScript and prefer a decorator-based approach to validation. It integrates seamlessly with class-transformer, making it ideal for applications that utilize TypeScript classes for data models and want to maintain type safety.

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 zod

zod is a TypeScript-first schema declaration and validation library. It allows developers to define schemas for their data structures and validate data against these schemas in a type-safe manner. Zod is particularly useful for ensuring that the data conforms to expected formats, making it a great choice for applications that require robust data validation. While Zod offers a powerful solution for schema validation, there are several alternatives in the ecosystem that provide similar functionalities. Here are a few notable alternatives:

  • io-ts is a runtime type system for TypeScript that allows you to define types and validate data at runtime. It provides a functional approach to validation and can be integrated with other libraries like fp-ts for functional programming paradigms. io-ts is particularly useful for applications that require both static type checking and runtime validation, making it a solid choice for developers who prioritize functional programming principles.

  • joi is a powerful schema description language and data validator for JavaScript objects. It provides a rich set of features for defining complex validation rules and is widely used in Node.js applications. Joi's expressive syntax allows developers to create detailed validation schemas with ease. If you are looking for a mature and feature-rich validation library that works well in both client-side and server-side applications, joi is an excellent option.

  • yup is a JavaScript schema builder for value parsing and validation. It is heavily inspired by Joi but is designed to work seamlessly with React and other modern JavaScript frameworks. Yup provides a simple and intuitive API for defining validation schemas and supports asynchronous validation. If you are building applications with React and need a validation library that integrates well with form libraries like Formik, yup is a great choice.

To see how zod compares with io-ts, joi, and yup, check out the comparison: Comparing io-ts vs joi vs yup vs zod.

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 yup

yup is a JavaScript schema builder for value parsing and validation. It is often used in conjunction with form libraries to ensure that user input meets certain criteria before being processed. Yup provides a fluent API for defining schemas, making it easy to validate complex data structures. While yup is a popular choice for validation, there are several alternatives available in the JavaScript ecosystem. Here are a few notable ones:

  • express-validator is a set of middleware functions that can be used to validate and sanitize user input in Express.js applications. It is built on top of validator.js and provides a simple way to validate request data, such as query parameters, body data, and headers. If you're working with an Express application and need to validate incoming requests, express-validator is a robust solution that integrates seamlessly with the Express framework.
  • joi is another powerful schema description language and data validator for JavaScript. It allows developers to create complex validation rules and provides a rich set of features for validating various data types. Joi is particularly useful for server-side validation in Node.js applications, and it can be used to validate incoming request data as well as data from other sources. If you need a comprehensive validation library that supports complex validation scenarios, joi is an excellent option.
  • validator.js is a library that provides a set of string validators and sanitizers. While it does not offer the same schema-based validation approach as yup, joi, or express-validator, it can be used in conjunction with other libraries to perform basic validation tasks. If you need lightweight validation functions for specific use cases, validator.js can be a useful addition to your toolkit.

For a detailed comparison of these validation libraries, check out the following link: Comparing express-validator vs joi vs yup.

Similar Npm Packages to class-validator

class-validator is a powerful validation library for TypeScript and JavaScript applications. It allows developers to define validation rules using decorators, making it easy to validate class instances. This library is particularly useful in scenarios where you want to enforce data integrity and ensure that the data being processed meets specific criteria. While class-validator is a great choice for validation, there are several alternatives available that cater to different needs and preferences. Here are a few notable alternatives:

  • ajv (Another JSON Schema Validator) is a fast and efficient JSON schema validator. It supports the latest JSON Schema standards and provides a robust way to validate JSON data structures. If you're working with JSON data and need a schema-based validation solution, ajv is an excellent choice. Its performance and compliance with JSON Schema standards make it suitable for applications that require strict validation of complex data structures.

  • joi is a popular validation library that allows you to create schemas for JavaScript objects. It provides a rich set of validation rules and is highly customizable. joi is particularly useful in Node.js applications and is often used in conjunction with frameworks like Express. If you need a flexible and expressive way to validate data structures, joi is a strong contender.

  • yup is a JavaScript schema builder for value parsing and validation. It is similar to joi but is designed to work seamlessly with React and other frontend libraries. yup provides a simple and intuitive API for defining validation schemas, making it a great choice for form validation in client-side applications. If you're looking for a lightweight and easy-to-use validation library for React, yup is worth considering.

  • zod is a TypeScript-first schema declaration and validation library. It offers a simple and expressive API for defining schemas and validating data. zod is particularly well-suited for TypeScript projects, as it provides strong type inference and validation capabilities. If you're working in a TypeScript environment and want a validation library that integrates well with TypeScript's type system, zod is an excellent option.

To see how class-validator compares with ajv, joi, yup, and zod, check out the comparison: Comparing ajv vs class-validator vs joi vs yup vs zod.

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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