<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 with draft 6 support.
[![Build Status](https://travis-ci.org/epoberezkin/ajv.svg?branch=master)](https://travis-ci.org/epoberezkin/ajv)
[![npm version](https://badge.fury.io/js/ajv.svg)](https://www.npmjs.com/package/ajv)
[![npm@beta](https://img.shields.io/npm/v/ajv/beta.svg)](https://github.com/epoberezkin/ajv/tree/beta)
[![npm downloads](https://img.shields.io/npm/dm/ajv.svg)](https://www.npmjs.com/package/ajv)
[![Coverage Status](https://coveralls.io/repos/epoberezkin/ajv/badge.svg?branch=master&service=github)](https://coveralls.io/github/epoberezkin/ajv?branch=master)
[![Greenkeeper badge](https://badges.greenkeeper.io/epoberezkin/ajv.svg)](https://greenkeeper.io/)
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__Please note__: Ajv [version 6](https://github.com/epoberezkin/ajv/tree/beta) with [JSON Schema draft-07](http://json-schema.org/work-in-progress) support is released. Use `npm install ajv@beta` to install.
## Using version 5
[JSON Schema draft-06](https://trac.tools.ietf.org/html/draft-wright-json-schema-validation-01) is published.
[Ajv version 5.0.0](https://github.com/epoberezkin/ajv/releases/tag/5.0.0) that supports draft-06 is released. It may require either migrating your schemas or updating your code (to continue using draft-04 and v5 schemas).
__Please note__: To use Ajv with draft-04 schemas you need to explicitly add meta-schema to the validator instance:
```javascript
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)
- [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)
- 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)
- [Related packages](#related-packages)
- [Packages using Ajv](#some-packages-using-ajv)
- [Tests, Contributing, History, 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):
[![performance](https://chart.googleapis.com/chart?chxt=x,y&cht=bhs&chco=76A4FB&chls=2.0&chbh=32,4,1&chs=600x416&chxl=-1:|djv|ajv|json-schema-validator-generator|jsen|is-my-json-valid|themis|z-schema|jsck|skeemas|json-schema-library|tv4&chd=t:100,98,72.1,66.8,50.1,15.1,6.1,3.8,1.2,0.7,0.2)](https://github.com/ebdrup/json-schema-benchmark/blob/master/README.md#performance)
## Features
- Ajv implements full JSON Schema [draft 6](http://json-schema.org/) and draft 4 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 4 standard and custom formats (can be turned off)
- [validates schemas against meta-schema](#api-validateschema)
- supports [browsers](#using-in-browser) and Node.js 0.10-8.x
- [asynchronous loading](#asynchronous-schema-compilation) of referenced schemas during compilation
- "All errors" validation mode with [option allErrors](#options)
- [error messages with parameters](#validation-errors) describing error reasons to allow creating custom error messages
- i18n error messages support with [ajv-i18n](https://github.com/epoberezkin/ajv-i18n) package
- [filtering data](#filtering-data) from additional properties
- [assigning defaults](#assigning-defaults) to missing properties and items
- [coercing data](#coercing-data-types) to the types specified in `type` keywords
- [custom keywords](#defining-custom-keywords)
- draft-6 keywords `const`, `contains` and `propertyNames`
- draft-6 boolean schemas (`true`/`false` as a schema to always pass/fail).
- keywords `switch`, `patternRequired`, `formatMaximum` / `formatMinimum` and `formatExclusiveMaximum` / `formatExclusiveMinimum` from [JSON-schema extension proposals](https://github.com/json-schema/json-schema/wiki/v5-Proposals) with [ajv-keywords](https://github.com/epoberezkin/ajv-keywords) package
- [$data reference](#data-reference) to use values from the validated data as values for the schema keywords
- [asynchronous validation](#asynchronous-validation) of custom formats and keywords
Currently Ajv is the only validator that passes all the tests from [JSON Schema Test Suite](https://github.com/json-schema/JSON-Schema-Test-Suite) (according to [json-schema-benchmark](https://github.com/ebdrup/json-schema-benchmark), apart from the test that requires that `1.0` is not an integer that is impossible to satisfy in JavaScript).
## Install
```
npm install ajv
```
or to install [version 6](https://github.com/epoberezkin/ajv/tree/beta):
```
npm install ajv@beta
```
## <a name="usage"></a>Getting started
Try it in the Node.js REPL: https://tonicdev.com/npm/ajv
The fastest validation call:
```javascript
var Ajv = require('ajv');
var ajv = new Ajv(); // options can be passed, e.g. {allErrors: true}
var validate = ajv.compile(schema);
var valid = validate(data);
if (!valid) console.log(validate.errors);
```
or with less code
```javascript
// ...
var valid = ajv.validate(schema, data);
if (!valid) console.log(ajv.errors);
// ...
```
or
```javascript
// ...
var valid = ajv.addSchema(schema, 'mySchema')
.validate('mySchema', data);
if (!valid) console.log(ajv.errorsText());
// ...
```
See [API](#api) and [Options](#options) for more details.
Ajv compiles schemas to functions and caches them in all cases (using schema serialized with [fast-json-stable-stringify](https://github.com/epoberezkin/fast-json-stable-stringify) or a custom function as a key), so that the next time the same schema is used (not necessarily the same object instance) it won't be compiled again.
The best performance is achieved when using compiled functions returned by `compile` or `getSchema` methods (there is no additional function call).
__Please note__: every time a validation function or `ajv.validate` are called `errors` property is overwritten. You need to copy `errors` array reference to another variable if you want to use it later (e.g., in the callback). See [Validation errors](#validation-errors)
## Using in browser
You can require Ajv directly from
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Node.js,简称Node,是一个开源且跨平台的JavaScript运行时环境,它允许在浏览器外运行JavaScript代码。Node.js于2009年由Ryan Dahl创立,旨在创建高性能的Web服务器和网络应用程序。它基于Google Chrome的V8 JavaScript引擎,可以在Windows、Linux、Unix、Mac OS X等操作系统上运行。 Node.js的特点之一是事件驱动和非阻塞I/O模型,这使得它非常适合处理大量并发连接,从而在构建实时应用程序如在线游戏、聊天应用以及实时通讯服务时表现卓越。此外,Node.js使用了模块化的架构,通过npm(Node package manager,Node包管理器),社区成员可以共享和复用代码,极大地促进了Node.js生态系统的发展和扩张。 Node.js不仅用于服务器端开发。随着技术的发展,它也被用于构建工具链、开发桌面应用程序、物联网设备等。Node.js能够处理文件系统、操作数据库、处理网络请求等,因此,开发者可以用JavaScript编写全栈应用程序,这一点大大提高了开发效率和便捷性。 在实践中,许多大型企业和组织已经采用Node.js作为其Web应用程序的开发平台,如Netflix、PayPal和Walmart等。它们利用Node.js提高了应用性能,简化了开发流程,并且能更快地响应市场需求。
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node-v11.5.0.tar.gz (2000个子文件)
ecp_nistz256_table.c 603KB
ares_platform.c 482KB
nghttp2_session.c 231KB
llhttp.c 174KB
curve25519.c 138KB
t1_lib.c 136KB
ec_curve.c 133KB
ssl_lib.c 124KB
test.c 117KB
nghttp2_hd_huffman_data.c 109KB
s_server.c 105KB
statem_srvr.c 105KB
s3_lib.c 102KB
x509_vfy.c 101KB
speed.c 99KB
e_aes.c 96KB
statem_clnt.c 90KB
s_client.c 89KB
ca.c 83KB
deflate.c 77KB
ares_init.c 74KB
ecp_nistp256.c 73KB
tty.c 73KB
ecp_nistp521.c 70KB
apps.c 70KB
gcm128.c 70KB
pipe.c 69KB
http_parser.c 69KB
fs.c 68KB
aes_core.c 61KB
nghttp2_hd.c 61KB
ssl_ciph.c 60KB
ecp_nistp224.c 59KB
bss_dgram.c 56KB
ssl3_record.c 55KB
e_capi.c 54KB
inflate.c 54KB
eng_cryptodev.c 53KB
ecp_nistz256.c 52KB
rec_layer_s3.c 51KB
t1_trce.c 46KB
ares_process.c 46KB
req.c 46KB
tcp.c 45KB
cms.c 44KB
stream.c 44KB
bn_exp.c 44KB
util.c 43KB
trees.c 43KB
rec_layer_d1.c 42KB
fs.c 41KB
gzlog.c 41KB
aes_x86core.c 40KB
v3_addr.c 40KB
ocsp.c 40KB
s_cb.c 39KB
e_chil.c 39KB
statem_dtls.c 39KB
ecp_smpl.c 38KB
bn_nist.c 37KB
tasn_dec.c 36KB
x509.c 36KB
ssl_err.c 36KB
ssl_sess.c 36KB
ec_asn1.c 36KB
poly1305.c 36KB
process.c 35KB
v3_utl.c 35KB
wp_block.c 34KB
pk7_doit.c 34KB
statem_lib.c 34KB
d1_lib.c 32KB
e_aes_cbc_hmac_sha1.c 31KB
e_aes_cbc_hmac_sha256.c 31KB
nghttp2_frame.c 31KB
ts.c 31KB
bn_gf2m.c 31KB
ssl_cert.c 31KB
pkcs12.c 29KB
udp.c 29KB
core.c 29KB
ec_mult.c 28KB
ec_lib.c 28KB
asn_mime.c 28KB
fsevents.c 28KB
ts_rsp_sign.c 27KB
ssl_rsa.c 27KB
bn_mul.c 27KB
bn_asm.c 27KB
ssl_conf.c 27KB
camellia.c 27KB
bn_const.c 26KB
cms_sd.c 26KB
nghttp2_stream.c 26KB
opt.c 26KB
v3_purp.c 26KB
rsa_ossl.c 26KB
b_print.c 26KB
aix.c 25KB
v3_asid.c 25KB
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