<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/)
[![Gitter](https://img.shields.io/gitter/room/ajv-validator/ajv.svg)](https://gitter.im/ajv-validator/ajv)
__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-v14.0.0.tar.gz (2000个子文件)
ecp_nistz256_table.c 603KB
ares_platform.c 482KB
curve25519.c 197KB
llhttp.c 188KB
ssl_lib.c 157KB
e_aes.c 143KB
statem_srvr.c 141KB
ec_curve.c 138KB
s3_lib.c 125KB
statem_clnt.c 123KB
speed.c 120KB
s_server.c 116KB
s_client.c 115KB
x509_vfy.c 101KB
curve448_tables.c 97KB
t1_lib.c 91KB
ca.c 84KB
statem_lib.c 79KB
deflate.c 79KB
ares_init.c 74KB
ecp_nistp256.c 74KB
apps.c 73KB
ecp_nistp521.c 72KB
ssl3_record.c 71KB
extensions_srvr.c 68KB
ssl_err.c 67KB
ssl_ciph.c 66KB
extensions_clnt.c 66KB
aes_core.c 61KB
rec_layer_s3.c 61KB
extensions.c 59KB
ecp_nistp224.c 59KB
ecp_nistz256.c 59KB
bss_dgram.c 57KB
t1_trce.c 54KB
gcm128.c 54KB
e_capi.c 54KB
inflate.c 54KB
req.c 51KB
ocsp.c 50KB
ecp_smpl.c 48KB
s_cb.c 47KB
ares_process.c 46KB
loader_file.c 44KB
bn_exp.c 44KB
cms.c 44KB
aria.c 44KB
trees.c 42KB
keccak1600.c 41KB
statem_dtls.c 41KB
v3_addr.c 40KB
aes_x86core.c 40KB
x509.c 39KB
ec_asn1.c 38KB
bn_nist.c 37KB
ssl_sess.c 37KB
tasn_dec.c 36KB
server.c 36KB
v3_utl.c 35KB
ssl_rsa.c 34KB
wp_block.c 34KB
pk7_doit.c 34KB
rec_layer_d1.c 34KB
ec_lib.c 33KB
drbg_lib.c 33KB
tls13_enc.c 33KB
ts_rsp_sign.c 32KB
e_aes_cbc_hmac_sha1.c 31KB
e_aes_cbc_hmac_sha256.c 31KB
pkcs12.c 31KB
ts.c 30KB
statem.c 30KB
ec_mult.c 30KB
ssl_conf.c 30KB
rsa_ameth.c 30KB
d1_lib.c 29KB
rsa_ossl.c 29KB
bn_gf2m.c 29KB
pem_lib.c 29KB
bn_dh.c 29KB
asn_mime.c 28KB
v3_purp.c 28KB
ssl_cert.c 27KB
pmeth_lib.c 27KB
cms_sd.c 27KB
bn_asm.c 27KB
ec2_smpl.c 27KB
v3_asid.c 26KB
passwd.c 26KB
rand_lib.c 26KB
bn_const.c 26KB
ui_lib.c 26KB
b_addr.c 26KB
e_aria.c 26KB
b_print.c 25KB
err.c 25KB
seed.c 25KB
e_dasync.c 25KB
rand_unix.c 25KB
camellia.c 25KB
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