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<img align="right" alt="Ajv logo" width="160" src="https://ajv.js.org/images/ajv_logo.png"> # Ajv: Another JSON Schema Validator The fastest JSON Schema validator for Node.js and browser. Supports draft-04/06/07. [](https://travis-ci.org/ajv-validator/ajv) [](https://www.npmjs.com/package/ajv) [](https://www.npmjs.com/package/ajv) [](https://coveralls.io/github/ajv-validator/ajv?branch=master) [](https://gitter.im/ajv-validator/ajv) [](https://github.com/sponsors/epoberezkin) ## Mozilla MOSS grant and OpenJS Foundation [<img src="https://www.poberezkin.com/images/mozilla.png" width="240" height="68">](https://www.mozilla.org/en-US/moss/) &nbsp;&nbsp;&nbsp; [<img src="https://www.poberezkin.com/images/openjs.png" width="220" height="68">](https://openjsf.org/blog/2020/08/14/ajv-joins-openjs-foundation-as-an-incubation-project/) 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](https://tools.ietf.org/html/draft-ucarion-json-type-definition-04). Ajv also joined [OpenJS Foundation](https://openjsf.org/) – having this support will help ensure the longevity and stability of Ajv for all its users. This [blog post](https://www.poberezkin.com/posts/2020-08-14-ajv-json-validator-mozilla-open-source-grant-openjs-foundation.html) has more details. 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. ## Please [sponsor Ajv development](https://github.com/sponsors/epoberezkin) 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: - [GitHub sponsors page](https://github.com/sponsors/epoberezkin) (GitHub will match it) - [Ajv Open Collective️](https://opencollective.com/ajv) Thank you. #### Open Collective sponsors <a href="https://opencollective.com/ajv"><img src="https://opencollective.com/ajv/individuals.svg?width=890"></a> <a href="https://opencollective.com/ajv/organization/0/website"><img src="https://opencollective.com/ajv/organization/0/avatar.svg"></a> <a href="https://opencollective.com/ajv/organization/1/website"><img src="https://opencollective.com/ajv/organization/1/avatar.svg"></a> <a href="https://opencollective.com/ajv/organization/2/website"><img src="https://opencollective.com/ajv/organization/2/avatar.svg"></a> <a href="https://opencollective.com/ajv/organization/3/website"><img src="https://opencollective.com/ajv/organization/3/avatar.svg"></a> <a href="https://opencollective.com/ajv/organization/4/website"><img src="https://opencollective.com/ajv/organization/4/avatar.svg"></a> <a href="https://opencollective.com/ajv/organization/5/website"><img src="https://opencollective.com/ajv/organization/5/avatar.svg"></a> <a href="https://opencollective.com/ajv/organization/6/website"><img src="https://opencollective.com/ajv/organization/6/avatar.svg"></a> <a href="https://opencollective.com/ajv/organization/7/website"><img src="https://opencollective.com/ajv/organization/7/avatar.svg"></a> <a href="https://opencollective.com/ajv/organization/8/website"><img src="https://opencollective.com/ajv/organization/8/avatar.svg"></a> <a href="https://opencollective.com/ajv/organization/9/website"><img src="https://opencollective.com/ajv/organization/9/avatar.svg"></a> ## Using version 6 [JSON Schema draft-07](http://json-schema.org/latest/json-schema-validation.html) is published. [Ajv version 6.0.0](https://github.com/ajv-validator/ajv/releases/tag/v6.0.0) that supports draft-07 is released. It may require either migrating your schemas or updating your code (to continue using draft-04 and v5 schemas, draft-06 schemas will be supported without changes). __Please note__: To use Ajv with draft-06 schemas you need to explicitly add the meta-schema to the validator instance: ```javascript ajv.addMetaSchema(require('ajv/lib/refs/json-schema-draft-06.json')); ``` To use Ajv with draft-04 schemas in addition to explicitly adding meta-schema you also need to use option schemaId: ```javascript var ajv = new Ajv({schemaId: 'id'}); // If you want to use both draft-04 and draft-06/07 schemas: // var ajv = new Ajv({schemaId: 'auto'}); ajv.addMetaSchema(require('ajv/lib/refs/json-schema-draft-04.json')); ``` ## Contents - [Performance](#performance) - [Features](#features) - [Getting started](#getting-started) - [Frequently Asked Questions](https://github.com/ajv-validator/ajv/blob/master/FAQ.md) - [Using in browser](#using-in-browser) - [Ajv and Content Security Policies (CSP)](#ajv-and-content-security-policies-csp) - [Command line interface](#command-line-interface) - Validation - [Keywords](#validation-keywords) - [Annotation keywords](#annotation-keywords) - [Formats](#formats) - [Combining schemas with $ref](#ref) - [$data reference](#data-reference) - NEW: [$merge and $patch keywords](#merge-and-patch-keywords) - [Defining custom keywords](#defining-custom-keywords) - [Asynchronous schema compilation](#asynchronous-schema-compilation) - [Asynchronous validation](#asynchronous-validation) - [Security considerations](#security-considerations) - [Security contact](#security-contact) - [Untrusted schemas](#untrusted-schemas) - [Circular references in objects](#circular-references-in-javascript-objects) - [Trusted schemas](#security-risks-of-trusted-schemas) - [ReDoS attack](#redos-attack) - Modifying data during validation - [Filtering data](#filtering-data) - [Assigning defaults](#assigning-defaults) - [Coercing data types](#coercing-data-types) - API - [Methods](#api) - [Options](#options) - [Validation errors](#validation-errors) - [Plugins](#plugins) - [Related packages](#related-packages) - [Some packages using Ajv](#some-packages-using-ajv) - [Tests, Contributing, Changes history](#tests) - [Support, Code of conduct, License](#open-source-software-support) ## Performance Ajv generates code using [doT templates](https://github.com/olado/doT) 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: - [json-schema-benchmark](https://github.com/ebdrup/json-schema-benchmark) - 50% faster than the second place - [jsck benchmark](https://github.com/pandastrike/jsck#benchmarks) - 20-190% faster - [z-schema benchmark](https://rawgit.com/zaggino/z-schema/master/benchmark/results.html) - [themis benchmark](https://cdn.rawgit.com/playlyfe/themis/master/benchmark/results.html) Performance of different validators by [json-schema-benchmark](https://github.com/ebdrup/json-schema-benchmark): [](