mirror of https://github.com/jkjoy/sunpeiwen.git
332 lines
22 KiB
Markdown
332 lines
22 KiB
Markdown
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<img align="right" alt="Ajv logo" width="160" src="https://ajv.js.org/img/ajv.svg">
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# Ajv: Another JSON schema validator
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Super fast JSON validator for Node.js and browser.
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Supports JSON Schema draft-06/07/2019-09 (draft-04 is supported in [version 6](https://github.com/ajv-validator/ajv/tree/v6)) and JSON Type Definition [RFC8927](https://datatracker.ietf.org/doc/rfc8927/).
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[](https://github.com/ajv-validator/ajv/actions?query=workflow%3Abuild)
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[](https://www.npmjs.com/package/ajv)
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[](https://www.npmjs.com/package/ajv)
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[](https://www.npmjs.com/package/ajv)
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[](https://coveralls.io/github/ajv-validator/ajv?branch=master)
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[](https://gitter.im/ajv-validator/ajv)
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[](https://github.com/sponsors/epoberezkin)
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## Platinum sponsors
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[<img src="https://ajv.js.org/img/mozilla.svg" width="45%">](https://www.mozilla.org)<img src="https://ajv.js.org/img/gap.svg" width="8%">[<img src="https://ajv.js.org/img/reserved.svg" width="45%">](https://opencollective.com/ajv)
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## Using version 7
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Ajv version 7 has these new features:
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- NEW: support of JSON Type Definition [RFC8927](https://datatracker.ietf.org/doc/rfc8927/) (from [v7.1.0](https://github.com/ajv-validator/ajv-keywords/releases/tag/v7.1.0)), including generation of [serializers](./docs/api.md#jtd-serialize) and [parsers](./docs/api.md#jtd-parse) from JTD schemas that are more efficient than native JSON serialization/parsing, combining JSON string parsing and validation in one function.
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- support of JSON Schema draft-2019-09 features: [`unevaluatedProperties`](./docs/json-schema.md#unevaluatedproperties) and [`unevaluatedItems`](./docs/json-schema.md#unevaluateditems), [dynamic recursive references](./docs/guide/combining-schemas.md#extending-recursive-schemas) and other [additional keywords](./docs/json-schema.md#json-schema-draft-2019-09).
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- to reduce the mistakes in JSON schemas and unexpected validation results, [strict mode](./docs/strict-mode.md) is added - it prohibits ignored or ambiguous JSON Schema elements.
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- to make code injection from untrusted schemas impossible, [code generation](./docs/codegen.md) is fully re-written to be safe and to allow code optimization (compiled schema code size is reduced by more than 10%).
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- to simplify Ajv extensions, the new keyword API that is used by pre-defined keywords is available to user-defined keywords - it is much easier to define any keywords now, especially with subschemas. [ajv-keywords](https://github.com/ajv-validator/ajv-keywords) package was updated to use the new API (in [v4.0.0](https://github.com/ajv-validator/ajv-keywords/releases/tag/v4.0.0))
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- schemas are compiled to ES6 code (ES5 code generation is also supported with an option).
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- to improve reliability and maintainability the code is migrated to TypeScript.
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**Please note**:
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- the support for JSON-Schema draft-04 is removed - if you have schemas using "id" attributes you have to replace them with "\$id" (or continue using [Ajv v6](https://github.com/ajv-validator/ajv/tree/v6) that will be supported until 02/28/2021).
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- all formats are separated to ajv-formats package - they have to be explicitly added if you use them.
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See [release notes](https://github.com/ajv-validator/ajv/releases/tag/v7.0.0) for the details.
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To install the new version:
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```bash
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npm install ajv
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```
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See [Getting started](#usage) for code example.
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## Contributing
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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.
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At Ajv, we are committed to creating more equitable and inclusive spaces for our community and team members to contribute to discussions that affect both this project and our ongoing work in the open source ecosystem.
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We strive to create an environment of respect and healthy discourse by setting standards for our interactions and we expect it from all members of our community - from long term project member to first time visitor. For more information, review our [code of conduct](./CODE_OF_CONDUCT.md) and values.
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<Contributors />
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### How we make decisions
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We value conscious curation of our library size, and balancing performance and functionality. To that end, we cannot accept every suggestion. When evaluating pull requests we consider:
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- Will this benefit many users or a niche use case?
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- How will this impact the performance of Ajv?
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- How will this expand our library size?
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To help us evaluate and understand, when you submit an issue and pull request:
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- Explain why this feature is important to the user base
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- Include documentation
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- Include test coverage with any new feature implementations
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Please include documentation and test coverage with any new feature implementations.
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To run tests:
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```bash
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npm install
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git submodule update --init
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npm test
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```
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`npm run build` - compiles typescript to `dist` folder.
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Please also review [Contributing guidelines](./CONTRIBUTING.md) and [Code components](./docs/components.md).
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## Contents
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- [Platinum sponsors](#platinum-sponsors)
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- [Using version 7](#using-version-7)
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- [Contributing](#contributing)
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- [Mozilla MOSS grant and OpenJS Foundation](#mozilla-moss-grant-and-openjs-foundation)
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- [Sponsors](#sponsors)
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- [Performance](#performance)
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- [Features](#features)
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- [Getting started](#usage)
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- [Choosing schema language: JSON Schema vs JSON Type Definition](./docs/guide/schema-language.md#comparison)
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- [Frequently Asked Questions](./docs/faq.md)
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- [Using in browser](./docs/guide/environments.md#browsers)
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- [Content Security Policy](./docs/security.md#content-security-policy)
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- [Using in ES5 environment](./docs/guide/environments.md#es5-environments)
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- [Command line interface](./docs/guide/environments.md#command-line-interface)
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- [API reference](./docs/api.md)
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- [Methods](./docs/api.md#ajv-constructor-and-methods)
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- [Options](./docs/api.md#options)
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- [Validation errors](./docs/api.md#validation-errors)
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- NEW: [Strict mode](./docs/strict-mode.md#strict-mode)
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- [Prohibit ignored keywords](./docs/strict-mode.md#prohibit-ignored-keywords)
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- [Prevent unexpected validation](./docs/strict-mode.md#prevent-unexpected-validation)
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- [Strict types](./docs/strict-mode.md#strict-types)
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- [Strict number validation](./docs/strict-mode.md#strict-number-validation)
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- [Validation guide](./docs/guide/getting-started.md)
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- [Getting started](./docs/guide/getting-started.md)
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- [Validating formats](./docs/guide/formats.md)
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- [Modular schemas](./docs/guide/combining-schemas.md): [combining with \$ref](./docs/guide/combining-schemas#ref), [\$data reference](./docs/guide/combining-schemas.md#data-reference), [$merge and $patch](./docs/guide/combining-schemas#merge-and-patch-keywords)
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- [Asynchronous schema compilation](./docs/guide/managing-schemas.md#asynchronous-schema-compilation)
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- [Standalone validation code](./docs/standalone.md)
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- [Asynchronous validation](./docs/guide/async-validation.md)
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- [Modifying data](./docs/guide/modifying-data.md): [additional properties](./docs/guide/modifying-data.md#removing-additional-properties), [defaults](./docs/guide/modifying-data.md#assigning-defaults), [type coercion](./docs/guide/modifying-data.md#coercing-data-types)
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- [Extending Ajv](#extending-ajv)
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- User-defined keywords:
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- [basics](./docs/guide/user-keywords.md)
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- [guide](./docs/keywords.md)
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- [Plugins](#plugins)
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- [Related packages](#related-packages)
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- [Security considerations](./docs/security.md)
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- [Security contact](./docs/security.md#security-contact)
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- [Untrusted schemas](./docs/security.md#untrusted-schemas)
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- [Circular references in objects](./docs/security.md#circular-references-in-javascript-objects)
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- [Trusted schemas](./docs/security.md#security-risks-of-trusted-schemas)
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- [ReDoS attack](./docs/security.md#redos-attack)
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- [Content Security Policy](./docs/security.md#content-security-policy)
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- [Some packages using Ajv](#some-packages-using-ajv)
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- [Changes history](#changes-history)
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- [Support, Code of conduct, Contacts, License](#open-source-software-support)
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## Mozilla MOSS grant and OpenJS Foundation
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[<img src="https://ajv.js.org/img/mozilla.svg" width="240" height="68">](https://www.mozilla.org/en-US/moss/)<img src="https://ajv.js.org/img/gap.svg" width="5%">[<img src="https://ajv.js.org/img/openjs.png" width="220" height="68">](https://openjsf.org/blog/2020/08/14/ajv-joins-openjs-foundation-as-an-incubation-project/)
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Ajv has been awarded a grant from Mozilla’s [Open Source Support (MOSS) program](https://www.mozilla.org/en-US/moss/) in the “Foundational Technology” track! It will sponsor the development of Ajv support of [JSON Schema version 2019-09](https://tools.ietf.org/html/draft-handrews-json-schema-02) and of [JSON Type Definition (RFC8927)](https://datatracker.ietf.org/doc/rfc8927/).
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Ajv also joined [OpenJS Foundation](https://openjsf.org/) – having this support will help ensure the longevity and stability of Ajv for all its users.
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This [blog post](https://www.poberezkin.com/posts/2020-08-14-ajv-json-validator-mozilla-open-source-grant-openjs-foundation.html) has more details.
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I am looking for the long term maintainers of Ajv – working with [ReadySet](https://www.thereadyset.co/), also sponsored by Mozilla, to establish clear guidelines for the role of a "maintainer" and the contribution standards, and to encourage a wider, more inclusive, contribution from the community.
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## <a name="sponsors"></a>Please [sponsor Ajv development](https://github.com/sponsors/epoberezkin)
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Since I asked to support Ajv development 40 people and 6 organizations contributed via GitHub and OpenCollective - this support helped receiving the MOSS grant!
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Your continuing support is very important - the funds will be used to develop and maintain Ajv once the next major version is released.
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Please sponsor Ajv via:
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- [GitHub sponsors page](https://github.com/sponsors/epoberezkin) (GitHub will match it)
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- [Ajv Open Collective️](https://opencollective.com/ajv)
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Thank you.
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#### Open Collective sponsors
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<a href="https://opencollective.com/ajv"><img src="https://opencollective.com/ajv/individuals.svg?width=890"></a>
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<a href="https://opencollective.com/ajv/organization/0/website"><img src="https://opencollective.com/ajv/organization/0/avatar.svg"></a>
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<a href="https://opencollective.com/ajv/organization/1/website"><img src="https://opencollective.com/ajv/organization/1/avatar.svg"></a>
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<a href="https://opencollective.com/ajv/organization/2/website"><img src="https://opencollective.com/ajv/organization/2/avatar.svg"></a>
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<a href="https://opencollective.com/ajv/organization/3/website"><img src="https://opencollective.com/ajv/organization/3/avatar.svg"></a>
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<a href="https://opencollective.com/ajv/organization/4/website"><img src="https://opencollective.com/ajv/organization/4/avatar.svg"></a>
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<a href="https://opencollective.com/ajv/organization/5/website"><img src="https://opencollective.com/ajv/organization/5/avatar.svg"></a>
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<a href="https://opencollective.com/ajv/organization/6/website"><img src="https://opencollective.com/ajv/organization/6/avatar.svg"></a>
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<a href="https://opencollective.com/ajv/organization/7/website"><img src="https://opencollective.com/ajv/organization/7/avatar.svg"></a>
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<a href="https://opencollective.com/ajv/organization/8/website"><img src="https://opencollective.com/ajv/organization/8/avatar.svg"></a>
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<a href="https://opencollective.com/ajv/organization/9/website"><img src="https://opencollective.com/ajv/organization/9/avatar.svg"></a>
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## Performance
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Ajv generates code to turn JSON Schemas into super-fast validation functions that are efficient for v8 optimization.
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Currently Ajv is the fastest and the most standard compliant validator according to these benchmarks:
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- [json-schema-benchmark](https://github.com/ebdrup/json-schema-benchmark) - 50% faster than the second place
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- [jsck benchmark](https://github.com/pandastrike/jsck#benchmarks) - 20-190% faster
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- [z-schema benchmark](https://rawgit.com/zaggino/z-schema/master/benchmark/results.html)
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- [themis benchmark](https://cdn.rawgit.com/playlyfe/themis/master/benchmark/results.html)
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Performance of different validators by [json-schema-benchmark](https://github.com/ebdrup/json-schema-benchmark):
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[](https://github.com/ebdrup/json-schema-benchmark/blob/master/README.md#performance)
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## Features
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- Ajv implements JSON Schema [draft-06/07/2019-09](http://json-schema.org/) standards (draft-04 is supported in v6):
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- all validation keywords (see [JSON Schema validation keywords](./docs/json-schema.md))
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- keyword "nullable" from [Open API 3 specification](https://swagger.io/docs/specification/data-models/data-types/).
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- full support of remote references (remote schemas have to be added with `addSchema` or compiled to be available)
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- support of circular references between schemas
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- correct string lengths for strings with unicode pairs
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- [formats](#formats) defined by JSON Schema draft-07 standard (with [ajv-formats](https://github.com/ajv-validator/ajv-formats) plugin) and additional formats (can be turned off)
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- [validates schemas against meta-schema](./docs/api.md#api-validateschema)
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- NEW: supports [JSON Type Definition](https://datatracker.ietf.org/doc/rfc8927/):
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- all forms (see [JSON Type Definition schema forms](./docs/json-type-definition.md))
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- meta-schema for JTD schemas
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- "union" keyword and user-defined keywords (can be used inside "metadata" member of the schema)
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- supports [browsers](#using-in-browser) and Node.js 0.10-14.x
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- [asynchronous loading](./docs/guide/managing-schemas.md#asynchronous-schema-compilation) of referenced schemas during compilation
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- "All errors" validation mode with [option allErrors](./docs/api.md#options)
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- [error messages with parameters](./docs/api.md#validation-errors) describing error reasons to allow error message generation
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- i18n error messages support with [ajv-i18n](https://github.com/ajv-validator/ajv-i18n) package
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- [removing-additional-properties](./docs/guide/modifying-data.md#removing-additional-properties)
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- [assigning defaults](./docs/guide/modifying-data.md#assigning-defaults) to missing properties and items
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- [coercing data](./docs/guide/modifying-data.md#coercing-data-types) to the types specified in `type` keywords
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- [user-defined keywords](#user-defined-keywords)
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- draft-06/07 keywords `const`, `contains`, `propertyNames` and `if/then/else`
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- draft-06 boolean schemas (`true`/`false` as a schema to always pass/fail).
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- additional extension keywords with [ajv-keywords](https://github.com/ajv-validator/ajv-keywords) package
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- [\$data reference](./docs/guide/combining-schemas.md#data-reference) to use values from the validated data as values for the schema keywords
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- [asynchronous validation](./docs/api.md#asynchronous-validation) of user-defined formats and keywords
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## Install
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To install version 7:
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```
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npm install ajv
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```
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## <a name="usage"></a>Getting started
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Try it in the Node.js REPL: https://runkit.com/npm/ajv
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In JavaScript:
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```javascript
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// or ESM/TypeScript import
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import Ajv from "ajv"
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// Node.js require:
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const Ajv = require("ajv").default
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const ajv = new Ajv() // options can be passed, e.g. {allErrors: true}
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const validate = ajv.compile(schema)
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const valid = validate(data)
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if (!valid) console.log(validate.errors)
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```
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See more examples in [Guide: getting started](./docs/guide/getting-started.md)
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## Extending Ajv
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### User defined keywords
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See section in [data validation](./docs/guide/user-keywords.md) and the [detailed guide](./docs/keywords.md).
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### Plugins
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|
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|
Ajv can be extended with plugins that add keywords, formats or functions to process generated code. When such plugin is published as npm package it is recommended that it follows these conventions:
|
|||
|
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|
|||
|
|
- it exports a function that accepts ajv instance as the first parameter - it allows using plugins with [ajv-cli](#command-line-interface).
|
|||
|
|
- this function returns the same instance to allow chaining.
|
|||
|
|
- this function can accept an optional configuration as the second parameter.
|
|||
|
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|
|||
|
|
You can import `Plugin` interface from ajv if you use Typescript.
|
|||
|
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|
|||
|
|
If you have published a useful plugin please submit a PR to add it to the next section.
|
|||
|
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|
|||
|
|
### Related packages
|
|||
|
|
|
|||
|
|
- [ajv-bsontype](https://github.com/BoLaMN/ajv-bsontype) - plugin to validate mongodb's bsonType formats
|
|||
|
|
- [ajv-cli](https://github.com/jessedc/ajv-cli) - command line interface
|
|||
|
|
- [ajv-formats](https://github.com/ajv-validator/ajv-formats) - formats defined in JSON Schema specification
|
|||
|
|
- [ajv-errors](https://github.com/ajv-validator/ajv-errors) - plugin for defining error messages in the schema
|
|||
|
|
- [ajv-i18n](https://github.com/ajv-validator/ajv-i18n) - internationalised error messages
|
|||
|
|
- [ajv-istanbul](https://github.com/ajv-validator/ajv-istanbul) - plugin to instrument generated validation code to measure test coverage of your schemas
|
|||
|
|
- [ajv-keywords](https://github.com/ajv-validator/ajv-keywords) - plugin with additional validation keywords (select, typeof, etc.)
|
|||
|
|
- [ajv-merge-patch](https://github.com/ajv-validator/ajv-merge-patch) - plugin with keywords $merge and $patch
|
|||
|
|
- [ajv-formats-draft2019](https://github.com/luzlab/ajv-formats-draft2019) - format validators for draft2019 that aren't included in [ajv-formats](https://github.com/ajv-validator/ajv-formats) (ie. `idn-hostname`, `idn-email`, `iri`, `iri-reference` and `duration`)
|
|||
|
|
|
|||
|
|
## Some packages using Ajv
|
|||
|
|
|
|||
|
|
- [webpack](https://github.com/webpack/webpack) - a module bundler. Its main purpose is to bundle JavaScript files for usage in a browser
|
|||
|
|
- [jsonscript-js](https://github.com/JSONScript/jsonscript-js) - the interpreter for [JSONScript](http://www.jsonscript.org) - scripted processing of existing endpoints and services
|
|||
|
|
- [osprey-method-handler](https://github.com/mulesoft-labs/osprey-method-handler) - Express middleware for validating requests and responses based on a RAML method object, used in [osprey](https://github.com/mulesoft/osprey) - validating API proxy generated from a RAML definition
|
|||
|
|
- [har-validator](https://github.com/ahmadnassri/har-validator) - HTTP Archive (HAR) validator
|
|||
|
|
- [jsoneditor](https://github.com/josdejong/jsoneditor) - a web-based tool to view, edit, format, and validate JSON http://jsoneditoronline.org
|
|||
|
|
- [JSON Schema Lint](https://github.com/nickcmaynard/jsonschemalint) - a web tool to validate JSON/YAML document against a single JSON Schema http://jsonschemalint.com
|
|||
|
|
- [objection](https://github.com/vincit/objection.js) - SQL-friendly ORM for Node.js
|
|||
|
|
- [table](https://github.com/gajus/table) - formats data into a string table
|
|||
|
|
- [ripple-lib](https://github.com/ripple/ripple-lib) - a JavaScript API for interacting with [Ripple](https://ripple.com) in Node.js and the browser
|
|||
|
|
- [restbase](https://github.com/wikimedia/restbase) - distributed storage with REST API & dispatcher for backend services built to provide a low-latency & high-throughput API for Wikipedia / Wikimedia content
|
|||
|
|
- [hippie-swagger](https://github.com/CacheControl/hippie-swagger) - [Hippie](https://github.com/vesln/hippie) wrapper that provides end to end API testing with swagger validation
|
|||
|
|
- [react-form-controlled](https://github.com/seeden/react-form-controlled) - React controlled form components with validation
|
|||
|
|
- [rabbitmq-schema](https://github.com/tjmehta/rabbitmq-schema) - a schema definition module for RabbitMQ graphs and messages
|
|||
|
|
- [@query/schema](https://www.npmjs.com/package/@query/schema) - stream filtering with a URI-safe query syntax parsing to JSON Schema
|
|||
|
|
- [chai-ajv-json-schema](https://github.com/peon374/chai-ajv-json-schema) - chai plugin to us JSON Schema with expect in mocha tests
|
|||
|
|
- [grunt-jsonschema-ajv](https://github.com/SignpostMarv/grunt-jsonschema-ajv) - Grunt plugin for validating files against JSON Schema
|
|||
|
|
- [extract-text-webpack-plugin](https://github.com/webpack-contrib/extract-text-webpack-plugin) - extract text from bundle into a file
|
|||
|
|
- [electron-builder](https://github.com/electron-userland/electron-builder) - a solution to package and build a ready for distribution Electron app
|
|||
|
|
- [addons-linter](https://github.com/mozilla/addons-linter) - Mozilla Add-ons Linter
|
|||
|
|
- [gh-pages-generator](https://github.com/epoberezkin/gh-pages-generator) - multi-page site generator converting markdown files to GitHub pages
|
|||
|
|
- [ESLint](https://github.com/eslint/eslint) - the pluggable linting utility for JavaScript and JSX
|
|||
|
|
- [Spectral](https://github.com/stoplightio/spectral) - the customizable linting utility for JSON/YAML, OpenAPI, AsyncAPI, and JSON Schema
|
|||
|
|
|
|||
|
|
## Changes history
|
|||
|
|
|
|||
|
|
See [https://github.com/ajv-validator/ajv/releases](https://github.com/ajv-validator/ajv/releases)
|
|||
|
|
|
|||
|
|
**Please note**: [Changes in version 7.0.0](https://github.com/ajv-validator/ajv/releases/tag/v7.0.0)
|
|||
|
|
|
|||
|
|
[Version 6.0.0](https://github.com/ajv-validator/ajv/releases/tag/v6.0.0).
|
|||
|
|
|
|||
|
|
## Code of conduct
|
|||
|
|
|
|||
|
|
Please review and follow the [Code of conduct](./CODE_OF_CONDUCT.md).
|
|||
|
|
|
|||
|
|
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](https://tidelift.com/security).
|
|||
|
|
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](https://tidelift.com/subscription/pkg/npm-ajv?utm_source=npm-ajv&utm_medium=referral&utm_campaign=readme) - it provides a centralised support to open-source software users, in addition to the support provided by software maintainers.
|
|||
|
|
|
|||
|
|
## License
|
|||
|
|
|
|||
|
|
[MIT](./LICENSE)
|