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<img align="right" alt="Ajv logo" width="160" src="http://epoberezkin.github.io/ajv/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/epoberezkin/ajv) [](https://www.npmjs.com/package/ajv) [](https://www.npmjs.com/package/ajv) [](https://coveralls.io/github/epoberezkin/ajv?branch=master) [](https://gitter.im/ajv-validator/ajv) [](https://github.com/sponsors/epoberezkin) ## Please [sponsor Ajv](https://github.com/sponsors/epoberezkin) Dear Ajv users! ❤️ I ask you to support the development of Ajv with donations. 🙏 Since 2015 Ajv has become widely used, thanks to your help and contributions: - **90** contributors 🏗 - **5,000** dependent npm packages ⚙️ - **7,000** github stars, from GitHub users [all over the world](https://www.google.com/maps/d/u/0/viewer?mid=1MGRV8ciFUGIbO1l0EKFWNJGYE7iSkDxP&ll=-3.81666561775622e-14%2C4.821737100000007&z=2) ⭐️ - **5,000,000** dependent repositories on GitHub 🚀 - **120,000,000** npm downloads per month! 💯 Your donations will fund futher development - small and large improvements, support of the next versions of JSON Schema specification, and, possibly, the code should be migrated to TypeScript to make it more maintainable. I will greatly appreciate anything you can help with to make it happen: - a **personal** donation - from $2 ☕️ - your **company** donation - from $10 🍔 - a **sponsorship** to get promoted on Ajv or related packages - from $50 💰 - an **introduction** to a sponsor who would benefit from the promotion on Ajv page 🤝 | Please [make donations via my GitHub sponsors page](https://github.com/sponsors/epoberezkin)<br>‼️ **GitHub will DOUBLE them** ‼️ | |---| #### 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/epoberezkin/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/epoberezkin/ajv/blob/master/FAQ.md) - [Using in browser](#using-in-browser) - [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, History, Support, License](#tests) ## 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): [](https://github.com/ebdrup/json-schema-benchmark/blob/master/README.md#performance) ## Features - Ajv implements full JSON Schema [draft-06/07](http://json-schema.org/) and draft-04 standards: - all validation keywords (see [JSON Schema validation keywords](https://github.com/epoberezkin/ajv/blob/master/KEYWORDS.md)) - full support of remote refs (remote schemas have to be added with `addSchema` or compiled to be available) - support of circular references between schemas - correct string lengths for strings with unicode pairs (can be turned off) - [formats](#formats) defined by JSON Schema draft-07 standard and custom formats (can be turned off) - [validates schemas against meta-schema](#api-validateschema) - supports [browsers](#using