ajv vs json-schema-to-ts
JSON Schema Validation Libraries Comparison
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What's JSON Schema Validation Libraries?

AJV (Another JSON Schema Validator) is a fast JSON schema validator that allows you to validate JSON objects against JSON schema definitions. It supports the latest JSON Schema standards and offers features like asynchronous validation and custom keywords. On the other hand, json-schema-to-ts is a library that converts JSON Schema definitions into TypeScript types, enabling developers to leverage type safety in TypeScript applications. While AJV focuses on validating JSON data, json-schema-to-ts is aimed at generating TypeScript types from JSON schemas, making it easier to integrate JSON data with TypeScript's type system.

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ajv135,788,03114,1461.03 MB2929 months agoMIT
json-schema-to-ts1,614,9651,552122 kB228 months agoMIT
Feature Comparison: ajv vs json-schema-to-ts

Validation Speed

  • ajv:

    AJV is known for its high performance and speed in validating JSON data against schemas. It compiles schemas into efficient JavaScript functions, allowing for rapid validation even with large datasets. This makes it suitable for applications that require real-time validation without significant performance overhead.

  • json-schema-to-ts:

    json-schema-to-ts does not perform validation; instead, it focuses on generating TypeScript types. Therefore, speed is not a relevant feature for this package as it is not concerned with runtime performance.

Schema Support

  • ajv:

    AJV supports the latest versions of JSON Schema, including draft-07 and draft-2019-09, and allows for advanced features like asynchronous validation, custom keywords, and error messages. This makes it highly versatile for various validation needs.

  • json-schema-to-ts:

    json-schema-to-ts supports JSON Schema draft-07 and can generate TypeScript types from schemas that conform to this standard. It is designed to work seamlessly with TypeScript, ensuring that the generated types accurately reflect the schema definitions.

Type Safety

  • ajv:

    While AJV provides validation capabilities, it does not inherently offer type safety in TypeScript applications. Developers need to manually ensure that the types align with the schemas they are validating.

  • json-schema-to-ts:

    json-schema-to-ts excels in providing type safety by generating TypeScript types directly from JSON schemas. This ensures that developers can leverage TypeScript's static type checking to catch errors at compile time, leading to more robust applications.

Ease of Use

  • ajv:

    AJV is relatively easy to use, with a straightforward API for validating JSON data. However, it may require some familiarity with JSON Schema concepts to fully utilize its features, especially for complex schemas.

  • json-schema-to-ts:

    json-schema-to-ts is also user-friendly, allowing developers to easily convert JSON schemas into TypeScript types with minimal configuration. Its integration with TypeScript makes it particularly appealing for TypeScript developers.

Community and Ecosystem

  • ajv:

    AJV has a strong community and is widely used in the industry, which means there are plenty of resources, documentation, and community support available for developers. It is also actively maintained and updated to keep up with JSON Schema standards.

  • json-schema-to-ts:

    json-schema-to-ts has a smaller community compared to AJV, but it is still a valuable tool for TypeScript developers. Its focused functionality on type generation means it may not have as extensive an ecosystem as AJV, but it is a reliable choice for those specifically needing type generation.

How to Choose: ajv vs json-schema-to-ts
  • ajv:

    Choose AJV if you need a robust and high-performance solution for validating JSON data against schemas, especially when working with large datasets or requiring extensive validation features. It is ideal for applications where data integrity and validation are critical.

  • json-schema-to-ts:

    Choose json-schema-to-ts if your primary goal is to generate TypeScript types from JSON schemas, allowing you to maintain type safety in your TypeScript applications. This is particularly useful when you want to ensure that your JSON data adheres to a specific structure defined by a schema.

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 json-schema-to-ts

json-schema-to-ts is a TypeScript utility that converts JSON Schema definitions into TypeScript types. This package is particularly useful for developers who want to leverage the power of TypeScript's type system while working with JSON data structures. By generating types directly from JSON Schema, developers can ensure that their data structures are validated and consistent throughout their applications. This can help reduce runtime errors and improve code maintainability, making it a valuable tool for projects that rely heavily on JSON data.

One notable alternative to json-schema-to-ts is ajv. Ajv stands for "Another JSON Schema Validator" and is a fast and powerful JSON Schema validator. While ajv focuses primarily on validating JSON data against a schema, it does not generate TypeScript types directly. Instead, it allows developers to ensure that their JSON data conforms to the specified schema, which is crucial for applications that rely on external data sources. If your primary need is to validate JSON data rather than generate TypeScript types, ajv is an excellent choice.

For a comparison of these packages, check out the following link: Comparing ajv vs json-schema-to-ts.

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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